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skia2/tools/viewer/Viewer.cpp
Brian Osman 7c979f52c3 Experimental Particle System 
This adds a new "Particles" slide to viewer, that allows
editing, loading, and saving particle effects. All of the
particle system code is in modules/particles.

There are many rough edges and some not-yet-finished changes
to generalize the model[1]. A rough overview:

- SkReflected.h implements a lightweight reflection system
  for classes derived from SkReflected. Adding a new class
  involves deriving from SkReflected, adding a macro to the
  class declaration, and implementing visitFields(), which
  simply calls a virtual on an SkFieldVisitor for each field.
  Currently, emitters and affectors use this mechanism.

- SkParticleSerialization.h demonstrates two useful field
  visitors - for serializing to and from JSON. The driver
  code that uses those is directly in ParticlesSlide.

- SkParticleData.h and SkCurve.h define a variety of helper
  types for talking about particles, both for parameterizing
  individual values, and communicating about the state of a
  particle among the effect, affectors, and emitters.

- SkParticleEffect.h defines the static data definition of
  an effect (SkParticleEffectParams), as well as a running
  instance of an effect (SkParticleEffect). The effect has
  simple update() and draw() methods.

- ParticlesSlide.cpp adds a third field visitor to generate
  GUIs for interactively editing the running effect.

---

1: The critical change I'd like to make is to remove all
special case behavior over time and at spawn (setting sprite
frames, size over time, color over time, etc...). Integration
is the only fixed function behavior. Everything else is driven
by two lists of affectors. One is applied at spawn time, using
the effect's lifetime to evaluate curves. This allows spawning
particles with different colors as the effect ages out, for
example. The second list is applied every frame to update
existing particles, and is driven by the particle's lifetime.
This allows particles to change color after being spawned, for
example.

With a small set of affectors using a single expressive curve
primitive (keyframed list of cubic curve segments), we can
have affectors that update color, size, velocity, position,
sprite frame, etc., and implement many complex behaviors.

Bug: skia:
Change-Id: Id9402bef22825d55d021c5a2f9e5e41791aabaf4
Reviewed-on: https://skia-review.googlesource.com/c/181404
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Reed <reed@google.com>
2019-02-12 18:53:41 +00:00

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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "BisectSlide.h"
#include "GMSlide.h"
#include "GrContext.h"
#include "GrContextPriv.h"
#include "ImageSlide.h"
#include "ParticlesSlide.h"
#include "Resources.h"
#include "SKPSlide.h"
#include "SampleSlide.h"
#include "SkCanvas.h"
#include "SkColorSpacePriv.h"
#include "SkCommandLineFlags.h"
#include "SkCommonFlags.h"
#include "SkCommonFlagsGpu.h"
#include "SkEventTracingPriv.h"
#include "SkFontMgrPriv.h"
#include "SkGraphics.h"
#include "SkImagePriv.h"
#include "SkJSONWriter.h"
#include "SkMakeUnique.h"
#include "SkOSFile.h"
#include "SkOSPath.h"
#include "SkPaintFilterCanvas.h"
#include "SkPictureRecorder.h"
#include "SkScan.h"
#include "SkStream.h"
#include "SkSurface.h"
#include "SkTaskGroup.h"
#include "SkTestFontMgr.h"
#include "SkTo.h"
#include "SlideDir.h"
#include "SvgSlide.h"
#include "Viewer.h"
#include "ccpr/GrCoverageCountingPathRenderer.h"
#include <stdlib.h>
#include <map>
#include "imgui.h"
#if defined(SK_ENABLE_SKOTTIE)
#include "SkottieSlide.h"
#endif
#if !(defined(SK_BUILD_FOR_WIN) && defined(__clang__))
#include "NIMASlide.h"
#endif
using namespace sk_app;
static std::map<GpuPathRenderers, std::string> gPathRendererNames;
Application* Application::Create(int argc, char** argv, void* platformData) {
return new Viewer(argc, argv, platformData);
}
static DEFINE_string(slide, "", "Start on this sample.");
static DEFINE_bool(list, false, "List samples?");
#ifdef SK_VULKAN
# define BACKENDS_STR "\"sw\", \"gl\", and \"vk\""
#elif defined(SK_METAL) && defined(SK_BUILD_FOR_MAC)
# define BACKENDS_STR "\"sw\", \"gl\", and \"mtl\""
#else
# define BACKENDS_STR "\"sw\" and \"gl\""
#endif
static DEFINE_string2(backend, b, "sw", "Backend to use. Allowed values are " BACKENDS_STR ".");
static DEFINE_int32(msaa, 1, "Number of subpixel samples. 0 for no HW antialiasing.");
DEFINE_string(bisect, "", "Path to a .skp or .svg file to bisect.");
DECLARE_int32(threads)
DEFINE_string2(file, f, "", "Open a single file for viewing.");
const char* kBackendTypeStrings[sk_app::Window::kBackendTypeCount] = {
"OpenGL",
#if SK_ANGLE && defined(SK_BUILD_FOR_WIN)
"ANGLE",
#endif
#ifdef SK_VULKAN
"Vulkan",
#endif
#if defined(SK_METAL) && defined(SK_BUILD_FOR_MAC)
"Metal",
#endif
"Raster"
};
static sk_app::Window::BackendType get_backend_type(const char* str) {
#ifdef SK_VULKAN
if (0 == strcmp(str, "vk")) {
return sk_app::Window::kVulkan_BackendType;
} else
#endif
#if SK_ANGLE && defined(SK_BUILD_FOR_WIN)
if (0 == strcmp(str, "angle")) {
return sk_app::Window::kANGLE_BackendType;
} else
#endif
#if defined(SK_METAL) && defined(SK_BUILD_FOR_MAC)
if (0 == strcmp(str, "mtl")) {
return sk_app::Window::kMetal_BackendType;
} else
#endif
if (0 == strcmp(str, "gl")) {
return sk_app::Window::kNativeGL_BackendType;
} else if (0 == strcmp(str, "sw")) {
return sk_app::Window::kRaster_BackendType;
} else {
SkDebugf("Unknown backend type, %s, defaulting to sw.", str);
return sk_app::Window::kRaster_BackendType;
}
}
static SkColorSpacePrimaries gSrgbPrimaries = {
0.64f, 0.33f,
0.30f, 0.60f,
0.15f, 0.06f,
0.3127f, 0.3290f };
static SkColorSpacePrimaries gAdobePrimaries = {
0.64f, 0.33f,
0.21f, 0.71f,
0.15f, 0.06f,
0.3127f, 0.3290f };
static SkColorSpacePrimaries gP3Primaries = {
0.680f, 0.320f,
0.265f, 0.690f,
0.150f, 0.060f,
0.3127f, 0.3290f };
static SkColorSpacePrimaries gRec2020Primaries = {
0.708f, 0.292f,
0.170f, 0.797f,
0.131f, 0.046f,
0.3127f, 0.3290f };
struct NamedPrimaries {
const char* fName;
SkColorSpacePrimaries* fPrimaries;
} gNamedPrimaries[] = {
{ "sRGB", &gSrgbPrimaries },
{ "AdobeRGB", &gAdobePrimaries },
{ "P3", &gP3Primaries },
{ "Rec. 2020", &gRec2020Primaries },
};
static bool primaries_equal(const SkColorSpacePrimaries& a, const SkColorSpacePrimaries& b) {
return memcmp(&a, &b, sizeof(SkColorSpacePrimaries)) == 0;
}
static Window::BackendType backend_type_for_window(Window::BackendType backendType) {
// In raster mode, we still use GL for the window.
// This lets us render the GUI faster (and correct).
return Window::kRaster_BackendType == backendType ? Window::kNativeGL_BackendType : backendType;
}
const char* kName = "name";
const char* kValue = "value";
const char* kOptions = "options";
const char* kSlideStateName = "Slide";
const char* kBackendStateName = "Backend";
const char* kMSAAStateName = "MSAA";
const char* kPathRendererStateName = "Path renderer";
const char* kSoftkeyStateName = "Softkey";
const char* kSoftkeyHint = "Please select a softkey";
const char* kFpsStateName = "FPS";
const char* kON = "ON";
const char* kOFF = "OFF";
const char* kRefreshStateName = "Refresh";
Viewer::Viewer(int argc, char** argv, void* platformData)
: fCurrentSlide(-1)
, fRefresh(false)
, fSaveToSKP(false)
, fShowImGuiDebugWindow(false)
, fShowSlidePicker(false)
, fShowImGuiTestWindow(false)
, fShowZoomWindow(false)
, fZoomWindowFixed(false)
, fZoomWindowLocation{0.0f, 0.0f}
, fLastImage(nullptr)
, fZoomUI(false)
, fBackendType(sk_app::Window::kNativeGL_BackendType)
, fColorMode(ColorMode::kLegacy)
, fColorSpacePrimaries(gSrgbPrimaries)
// Our UI can only tweak gamma (currently), so start out gamma-only
, fColorSpaceTransferFn(SkNamedTransferFn::k2Dot2)
, fZoomLevel(0.0f)
, fRotation(0.0f)
, fOffset{0.5f, 0.5f}
, fGestureDevice(GestureDevice::kNone)
, fTiled(false)
, fDrawTileBoundaries(false)
, fTileScale{0.25f, 0.25f}
, fPerspectiveMode(kPerspective_Off)
{
SkGraphics::Init();
gPathRendererNames[GpuPathRenderers::kAll] = "All Path Renderers";
gPathRendererNames[GpuPathRenderers::kStencilAndCover] = "NV_path_rendering";
gPathRendererNames[GpuPathRenderers::kSmall] = "Small paths (cached sdf or alpha masks)";
gPathRendererNames[GpuPathRenderers::kCoverageCounting] = "Coverage counting";
gPathRendererNames[GpuPathRenderers::kTessellating] = "Tessellating";
gPathRendererNames[GpuPathRenderers::kNone] = "Software masks";
SkDebugf("Command line arguments: ");
for (int i = 1; i < argc; ++i) {
SkDebugf("%s ", argv[i]);
}
SkDebugf("\n");
SkCommandLineFlags::Parse(argc, argv);
#ifdef SK_BUILD_FOR_ANDROID
SetResourcePath("/data/local/tmp/resources");
#endif
if (!FLAGS_nativeFonts) {
gSkFontMgr_DefaultFactory = &sk_tool_utils::MakePortableFontMgr;
}
initializeEventTracingForTools();
static SkTaskGroup::Enabler kTaskGroupEnabler(FLAGS_threads);
fBackendType = get_backend_type(FLAGS_backend[0]);
fWindow = Window::CreateNativeWindow(platformData);
DisplayParams displayParams;
displayParams.fMSAASampleCount = FLAGS_msaa;
SetCtxOptionsFromCommonFlags(&displayParams.fGrContextOptions);
fWindow->setRequestedDisplayParams(displayParams);
// Configure timers
fStatsLayer.setActive(false);
fAnimateTimer = fStatsLayer.addTimer("Animate", SK_ColorMAGENTA, 0xffff66ff);
fPaintTimer = fStatsLayer.addTimer("Paint", SK_ColorGREEN);
fFlushTimer = fStatsLayer.addTimer("Flush", SK_ColorRED, 0xffff6666);
// register callbacks
fCommands.attach(fWindow);
fWindow->pushLayer(this);
fWindow->pushLayer(&fStatsLayer);
fWindow->pushLayer(&fImGuiLayer);
// add key-bindings
fCommands.addCommand(' ', "GUI", "Toggle Debug GUI", [this]() {
this->fShowImGuiDebugWindow = !this->fShowImGuiDebugWindow;
fWindow->inval();
});
// Command to jump directly to the slide picker and give it focus
fCommands.addCommand('/', "GUI", "Jump to slide picker", [this]() {
this->fShowImGuiDebugWindow = true;
this->fShowSlidePicker = true;
fWindow->inval();
});
// Alias that to Backspace, to match SampleApp
fCommands.addCommand(Window::Key::kBack, "Backspace", "GUI", "Jump to slide picker", [this]() {
this->fShowImGuiDebugWindow = true;
this->fShowSlidePicker = true;
fWindow->inval();
});
fCommands.addCommand('g', "GUI", "Toggle GUI Demo", [this]() {
this->fShowImGuiTestWindow = !this->fShowImGuiTestWindow;
fWindow->inval();
});
fCommands.addCommand('z', "GUI", "Toggle zoom window", [this]() {
this->fShowZoomWindow = !this->fShowZoomWindow;
fWindow->inval();
});
fCommands.addCommand('Z', "GUI", "Toggle zoom window state", [this]() {
this->fZoomWindowFixed = !this->fZoomWindowFixed;
fWindow->inval();
});
fCommands.addCommand('s', "Overlays", "Toggle stats display", [this]() {
fStatsLayer.setActive(!fStatsLayer.getActive());
fWindow->inval();
});
fCommands.addCommand('0', "Overlays", "Reset stats", [this]() {
fStatsLayer.resetMeasurements();
this->updateTitle();
fWindow->inval();
});
fCommands.addCommand('c', "Modes", "Cycle color mode", [this]() {
switch (fColorMode) {
case ColorMode::kLegacy:
this->setColorMode(ColorMode::kColorManaged8888);
break;
case ColorMode::kColorManaged8888:
this->setColorMode(ColorMode::kColorManagedF16);
break;
case ColorMode::kColorManagedF16:
this->setColorMode(ColorMode::kLegacy);
break;
}
});
fCommands.addCommand(Window::Key::kRight, "Right", "Navigation", "Next slide", [this]() {
this->setCurrentSlide(fCurrentSlide < fSlides.count() - 1 ? fCurrentSlide + 1 : 0);
});
fCommands.addCommand(Window::Key::kLeft, "Left", "Navigation", "Previous slide", [this]() {
this->setCurrentSlide(fCurrentSlide > 0 ? fCurrentSlide - 1 : fSlides.count() - 1);
});
fCommands.addCommand(Window::Key::kUp, "Up", "Transform", "Zoom in", [this]() {
this->changeZoomLevel(1.f / 32.f);
fWindow->inval();
});
fCommands.addCommand(Window::Key::kDown, "Down", "Transform", "Zoom out", [this]() {
this->changeZoomLevel(-1.f / 32.f);
fWindow->inval();
});
fCommands.addCommand('d', "Modes", "Change rendering backend", [this]() {
sk_app::Window::BackendType newBackend = (sk_app::Window::BackendType)(
(fBackendType + 1) % sk_app::Window::kBackendTypeCount);
// Switching to and from Vulkan is problematic on Linux so disabled for now
#if defined(SK_BUILD_FOR_UNIX) && defined(SK_VULKAN)
if (newBackend == sk_app::Window::kVulkan_BackendType) {
newBackend = (sk_app::Window::BackendType)((newBackend + 1) %
sk_app::Window::kBackendTypeCount);
} else if (fBackendType == sk_app::Window::kVulkan_BackendType) {
newBackend = sk_app::Window::kVulkan_BackendType;
}
#endif
this->setBackend(newBackend);
});
fCommands.addCommand('K', "IO", "Save slide to SKP", [this]() {
fSaveToSKP = true;
fWindow->inval();
});
fCommands.addCommand('G', "Modes", "Geometry", [this]() {
DisplayParams params = fWindow->getRequestedDisplayParams();
uint32_t flags = params.fSurfaceProps.flags();
if (!fPixelGeometryOverrides) {
fPixelGeometryOverrides = true;
params.fSurfaceProps = SkSurfaceProps(flags, kUnknown_SkPixelGeometry);
} else {
switch (params.fSurfaceProps.pixelGeometry()) {
case kUnknown_SkPixelGeometry:
params.fSurfaceProps = SkSurfaceProps(flags, kRGB_H_SkPixelGeometry);
break;
case kRGB_H_SkPixelGeometry:
params.fSurfaceProps = SkSurfaceProps(flags, kBGR_H_SkPixelGeometry);
break;
case kBGR_H_SkPixelGeometry:
params.fSurfaceProps = SkSurfaceProps(flags, kRGB_V_SkPixelGeometry);
break;
case kRGB_V_SkPixelGeometry:
params.fSurfaceProps = SkSurfaceProps(flags, kBGR_V_SkPixelGeometry);
break;
case kBGR_V_SkPixelGeometry:
params.fSurfaceProps = SkSurfaceProps(flags, SkSurfaceProps::kLegacyFontHost_InitType);
fPixelGeometryOverrides = false;
break;
}
}
fWindow->setRequestedDisplayParams(params);
this->updateTitle();
fWindow->inval();
});
fCommands.addCommand('H', "Font", "Hinting mode", [this]() {
if (!fFontOverrides.fHinting) {
fFontOverrides.fHinting = true;
fFont.setHinting(kNo_SkFontHinting);
} else {
switch (fFont.getHinting()) {
case kNo_SkFontHinting:
fFont.setHinting(kSlight_SkFontHinting);
break;
case kSlight_SkFontHinting:
fFont.setHinting(kNormal_SkFontHinting);
break;
case kNormal_SkFontHinting:
fFont.setHinting(kFull_SkFontHinting);
break;
case kFull_SkFontHinting:
fFont.setHinting(kNo_SkFontHinting);
fFontOverrides.fHinting = false;
break;
}
}
this->updateTitle();
fWindow->inval();
});
fCommands.addCommand('A', "Paint", "Antialias Mode", [this]() {
if (!fPaintOverrides.fAntiAlias) {
fPaintOverrides.fAntiAliasState = SkPaintFields::AntiAliasState::Alias;
fPaintOverrides.fAntiAlias = true;
fPaint.setAntiAlias(false);
gSkUseAnalyticAA = gSkForceAnalyticAA = false;
gSkUseDeltaAA = gSkForceDeltaAA = false;
} else {
fPaint.setAntiAlias(true);
switch (fPaintOverrides.fAntiAliasState) {
case SkPaintFields::AntiAliasState::Alias:
fPaintOverrides.fAntiAliasState = SkPaintFields::AntiAliasState::Normal;
gSkUseAnalyticAA = gSkForceAnalyticAA = false;
gSkUseDeltaAA = gSkForceDeltaAA = false;
break;
case SkPaintFields::AntiAliasState::Normal:
fPaintOverrides.fAntiAliasState = SkPaintFields::AntiAliasState::AnalyticAAEnabled;
gSkUseAnalyticAA = true;
gSkForceAnalyticAA = false;
gSkUseDeltaAA = gSkForceDeltaAA = false;
break;
case SkPaintFields::AntiAliasState::AnalyticAAEnabled:
fPaintOverrides.fAntiAliasState = SkPaintFields::AntiAliasState::AnalyticAAForced;
gSkUseAnalyticAA = gSkForceAnalyticAA = true;
gSkUseDeltaAA = gSkForceDeltaAA = false;
break;
case SkPaintFields::AntiAliasState::AnalyticAAForced:
fPaintOverrides.fAntiAliasState = SkPaintFields::AntiAliasState::DeltaAAEnabled;
gSkUseAnalyticAA = gSkForceAnalyticAA = false;
gSkUseDeltaAA = true;
gSkForceDeltaAA = false;
break;
case SkPaintFields::AntiAliasState::DeltaAAEnabled:
fPaintOverrides.fAntiAliasState = SkPaintFields::AntiAliasState::DeltaAAForced;
gSkUseAnalyticAA = gSkForceAnalyticAA = false;
gSkUseDeltaAA = gSkForceDeltaAA = true;
break;
case SkPaintFields::AntiAliasState::DeltaAAForced:
fPaintOverrides.fAntiAliasState = SkPaintFields::AntiAliasState::Alias;
fPaintOverrides.fAntiAlias = false;
gSkUseAnalyticAA = fPaintOverrides.fOriginalSkUseAnalyticAA;
gSkForceAnalyticAA = fPaintOverrides.fOriginalSkForceAnalyticAA;
gSkUseDeltaAA = fPaintOverrides.fOriginalSkUseDeltaAA;
gSkForceDeltaAA = fPaintOverrides.fOriginalSkForceDeltaAA;
break;
}
}
this->updateTitle();
fWindow->inval();
});
fCommands.addCommand('D', "Modes", "DFT", [this]() {
DisplayParams params = fWindow->getRequestedDisplayParams();
uint32_t flags = params.fSurfaceProps.flags();
flags ^= SkSurfaceProps::kUseDeviceIndependentFonts_Flag;
params.fSurfaceProps = SkSurfaceProps(flags, params.fSurfaceProps.pixelGeometry());
fWindow->setRequestedDisplayParams(params);
this->updateTitle();
fWindow->inval();
});
fCommands.addCommand('L', "Font", "Subpixel Antialias Mode", [this]() {
if (!fFontOverrides.fEdging) {
fFontOverrides.fEdging = true;
fFont.setEdging(SkFont::Edging::kAlias);
} else {
switch (fFont.getEdging()) {
case SkFont::Edging::kAlias:
fFont.setEdging(SkFont::Edging::kAntiAlias);
break;
case SkFont::Edging::kAntiAlias:
fFont.setEdging(SkFont::Edging::kSubpixelAntiAlias);
break;
case SkFont::Edging::kSubpixelAntiAlias:
fFont.setEdging(SkFont::Edging::kAlias);
fFontOverrides.fEdging = false;
break;
}
}
this->updateTitle();
fWindow->inval();
});
fCommands.addCommand('S', "Font", "Subpixel Position Mode", [this]() {
if (!fFontOverrides.fSubpixel) {
fFontOverrides.fSubpixel = true;
fFont.setSubpixel(false);
} else {
if (!fFont.isSubpixel()) {
fFont.setSubpixel(true);
} else {
fFontOverrides.fSubpixel = false;
}
}
this->updateTitle();
fWindow->inval();
});
fCommands.addCommand('p', "Transform", "Toggle Perspective Mode", [this]() {
fPerspectiveMode = (kPerspective_Real == fPerspectiveMode) ? kPerspective_Fake
: kPerspective_Real;
this->updateTitle();
fWindow->inval();
});
fCommands.addCommand('P', "Transform", "Toggle Perspective", [this]() {
fPerspectiveMode = (kPerspective_Off == fPerspectiveMode) ? kPerspective_Real
: kPerspective_Off;
this->updateTitle();
fWindow->inval();
});
fCommands.addCommand('a', "Transform", "Toggle Animation", [this]() {
fAnimTimer.togglePauseResume();
});
fCommands.addCommand('u', "GUI", "Zoom UI", [this]() {
fZoomUI = !fZoomUI;
fStatsLayer.setDisplayScale(fZoomUI ? 2.0f : 1.0f);
fWindow->inval();
});
// set up slides
this->initSlides();
if (FLAGS_list) {
this->listNames();
}
fPerspectivePoints[0].set(0, 0);
fPerspectivePoints[1].set(1, 0);
fPerspectivePoints[2].set(0, 1);
fPerspectivePoints[3].set(1, 1);
fAnimTimer.run();
auto gamutImage = GetResourceAsImage("images/gamut.png");
if (gamutImage) {
fImGuiGamutPaint.setShader(gamutImage->makeShader());
}
fImGuiGamutPaint.setColor(SK_ColorWHITE);
fImGuiGamutPaint.setFilterQuality(kLow_SkFilterQuality);
fWindow->attach(backend_type_for_window(fBackendType));
this->setCurrentSlide(this->startupSlide());
}
void Viewer::initSlides() {
using SlideFactory = sk_sp<Slide>(*)(const SkString& name, const SkString& path);
static const struct {
const char* fExtension;
const char* fDirName;
const SkCommandLineFlags::StringArray& fFlags;
const SlideFactory fFactory;
} gExternalSlidesInfo[] = {
{ ".skp", "skp-dir", FLAGS_skps,
[](const SkString& name, const SkString& path) -> sk_sp<Slide> {
return sk_make_sp<SKPSlide>(name, path);}
},
{ ".jpg", "jpg-dir", FLAGS_jpgs,
[](const SkString& name, const SkString& path) -> sk_sp<Slide> {
return sk_make_sp<ImageSlide>(name, path);}
},
#if defined(SK_ENABLE_SKOTTIE)
{ ".json", "skottie-dir", FLAGS_lotties,
[](const SkString& name, const SkString& path) -> sk_sp<Slide> {
return sk_make_sp<SkottieSlide>(name, path);}
},
#endif
#if defined(SK_XML)
{ ".svg", "svg-dir", FLAGS_svgs,
[](const SkString& name, const SkString& path) -> sk_sp<Slide> {
return sk_make_sp<SvgSlide>(name, path);}
},
#endif
#if !(defined(SK_BUILD_FOR_WIN) && defined(__clang__))
{ ".nima", "nima-dir", FLAGS_nimas,
[](const SkString& name, const SkString& path) -> sk_sp<Slide> {
return sk_make_sp<NIMASlide>(name, path);}
},
#endif
};
SkTArray<sk_sp<Slide>> dirSlides;
const auto addSlide = [&](const SkString& name,
const SkString& path,
const SlideFactory& fact) {
if (SkCommandLineFlags::ShouldSkip(FLAGS_match, name.c_str())) {
return;
}
if (auto slide = fact(name, path)) {
dirSlides.push_back(slide);
fSlides.push_back(std::move(slide));
}
};
if (!FLAGS_file.isEmpty()) {
// single file mode
const SkString file(FLAGS_file[0]);
if (sk_exists(file.c_str(), kRead_SkFILE_Flag)) {
for (const auto& sinfo : gExternalSlidesInfo) {
if (file.endsWith(sinfo.fExtension)) {
addSlide(SkOSPath::Basename(file.c_str()), file, sinfo.fFactory);
return;
}
}
fprintf(stderr, "Unsupported file type \"%s\"\n", file.c_str());
} else {
fprintf(stderr, "Cannot read \"%s\"\n", file.c_str());
}
return;
}
// Bisect slide.
if (!FLAGS_bisect.isEmpty()) {
sk_sp<BisectSlide> bisect = BisectSlide::Create(FLAGS_bisect[0]);
if (bisect && !SkCommandLineFlags::ShouldSkip(FLAGS_match, bisect->getName().c_str())) {
if (FLAGS_bisect.count() >= 2) {
for (const char* ch = FLAGS_bisect[1]; *ch; ++ch) {
bisect->onChar(*ch);
}
}
fSlides.push_back(std::move(bisect));
}
}
// GMs
int firstGM = fSlides.count();
for (skiagm::GMFactory gmFactory : skiagm::GMRegistry::Range()) {
std::unique_ptr<skiagm::GM> gm(gmFactory(nullptr));
if (!SkCommandLineFlags::ShouldSkip(FLAGS_match, gm->getName())) {
sk_sp<Slide> slide(new GMSlide(gm.release()));
fSlides.push_back(std::move(slide));
}
}
// reverse gms
int numGMs = fSlides.count() - firstGM;
for (int i = 0; i < numGMs/2; ++i) {
std::swap(fSlides[firstGM + i], fSlides[fSlides.count() - i - 1]);
}
// samples
for (const SampleFactory factory : SampleRegistry::Range()) {
sk_sp<Slide> slide(new SampleSlide(factory));
if (!SkCommandLineFlags::ShouldSkip(FLAGS_match, slide->getName().c_str())) {
fSlides.push_back(slide);
}
}
// Particle demo
{
// TODO: Convert this to a sample
sk_sp<Slide> slide(new ParticlesSlide());
if (!SkCommandLineFlags::ShouldSkip(FLAGS_match, slide->getName().c_str())) {
fSlides.push_back(std::move(slide));
}
}
for (const auto& info : gExternalSlidesInfo) {
for (const auto& flag : info.fFlags) {
if (SkStrEndsWith(flag.c_str(), info.fExtension)) {
// single file
addSlide(SkOSPath::Basename(flag.c_str()), flag, info.fFactory);
} else {
// directory
SkOSFile::Iter it(flag.c_str(), info.fExtension);
SkString name;
while (it.next(&name)) {
addSlide(name, SkOSPath::Join(flag.c_str(), name.c_str()), info.fFactory);
}
}
if (!dirSlides.empty()) {
fSlides.push_back(
sk_make_sp<SlideDir>(SkStringPrintf("%s[%s]", info.fDirName, flag.c_str()),
std::move(dirSlides)));
dirSlides.reset(); // NOLINT(bugprone-use-after-move)
}
}
}
}
Viewer::~Viewer() {
fWindow->detach();
delete fWindow;
}
struct SkPaintTitleUpdater {
SkPaintTitleUpdater(SkString* title) : fTitle(title), fCount(0) {}
void append(const char* s) {
if (fCount == 0) {
fTitle->append(" {");
} else {
fTitle->append(", ");
}
fTitle->append(s);
++fCount;
}
void done() {
if (fCount > 0) {
fTitle->append("}");
}
}
SkString* fTitle;
int fCount;
};
void Viewer::updateTitle() {
if (!fWindow) {
return;
}
if (fWindow->sampleCount() < 1) {
return; // Surface hasn't been created yet.
}
SkString title("Viewer: ");
title.append(fSlides[fCurrentSlide]->getName());
if (gSkUseDeltaAA) {
if (gSkForceDeltaAA) {
title.append(" <FDAA>");
} else {
title.append(" <DAA>");
}
} else if (gSkUseAnalyticAA) {
if (gSkForceAnalyticAA) {
title.append(" <FAAA>");
} else {
title.append(" <AAA>");
}
}
SkPaintTitleUpdater paintTitle(&title);
auto paintFlag = [this, &paintTitle](bool SkPaintFields::* flag,
bool (SkPaint::* isFlag)() const,
const char* on, const char* off)
{
if (fPaintOverrides.*flag) {
paintTitle.append((fPaint.*isFlag)() ? on : off);
}
};
auto fontFlag = [this, &paintTitle](bool SkFontFields::* flag, bool (SkFont::* isFlag)() const,
const char* on, const char* off)
{
if (fFontOverrides.*flag) {
paintTitle.append((fFont.*isFlag)() ? on : off);
}
};
paintFlag(&SkPaintFields::fAntiAlias, &SkPaint::isAntiAlias, "Antialias", "Alias");
paintFlag(&SkPaintFields::fDither, &SkPaint::isDither, "DITHER", "No Dither");
fontFlag(&SkFontFields::fForceAutoHinting, &SkFont::isForceAutoHinting,
"Force Autohint", "No Force Autohint");
fontFlag(&SkFontFields::fEmbolden, &SkFont::isEmbolden, "Fake Bold", "No Fake Bold");
fontFlag(&SkFontFields::fLinearMetrics, &SkFont::isLinearMetrics,
"Linear Metrics", "Non-Linear Metrics");
fontFlag(&SkFontFields::fEmbeddedBitmaps, &SkFont::isEmbeddedBitmaps,
"Bitmap Text", "No Bitmap Text");
fontFlag(&SkFontFields::fSubpixel, &SkFont::isSubpixel, "Subpixel Text", "Pixel Text");
if (fFontOverrides.fEdging) {
switch (fFont.getEdging()) {
case SkFont::Edging::kAlias:
paintTitle.append("Alias Text");
break;
case SkFont::Edging::kAntiAlias:
paintTitle.append("Antialias Text");
break;
case SkFont::Edging::kSubpixelAntiAlias:
paintTitle.append("Subpixel Antialias Text");
break;
}
}
if (fFontOverrides.fHinting) {
switch (fFont.getHinting()) {
case kNo_SkFontHinting:
paintTitle.append("No Hinting");
break;
case kSlight_SkFontHinting:
paintTitle.append("Slight Hinting");
break;
case kNormal_SkFontHinting:
paintTitle.append("Normal Hinting");
break;
case kFull_SkFontHinting:
paintTitle.append("Full Hinting");
break;
}
}
paintTitle.done();
switch (fColorMode) {
case ColorMode::kLegacy:
title.append(" Legacy 8888");
break;
case ColorMode::kColorManaged8888:
title.append(" ColorManaged 8888");
break;
case ColorMode::kColorManagedF16:
title.append(" ColorManaged F16");
break;
}
if (ColorMode::kLegacy != fColorMode) {
int curPrimaries = -1;
for (size_t i = 0; i < SK_ARRAY_COUNT(gNamedPrimaries); ++i) {
if (primaries_equal(*gNamedPrimaries[i].fPrimaries, fColorSpacePrimaries)) {
curPrimaries = i;
break;
}
}
title.appendf(" %s Gamma %f",
curPrimaries >= 0 ? gNamedPrimaries[curPrimaries].fName : "Custom",
fColorSpaceTransferFn.g);
}
const DisplayParams& params = fWindow->getRequestedDisplayParams();
if (fPixelGeometryOverrides) {
switch (params.fSurfaceProps.pixelGeometry()) {
case kUnknown_SkPixelGeometry:
title.append( " Flat");
break;
case kRGB_H_SkPixelGeometry:
title.append( " RGB");
break;
case kBGR_H_SkPixelGeometry:
title.append( " BGR");
break;
case kRGB_V_SkPixelGeometry:
title.append( " RGBV");
break;
case kBGR_V_SkPixelGeometry:
title.append( " BGRV");
break;
}
}
if (params.fSurfaceProps.isUseDeviceIndependentFonts()) {
title.append(" DFT");
}
title.append(" [");
title.append(kBackendTypeStrings[fBackendType]);
int msaa = fWindow->sampleCount();
if (msaa > 1) {
title.appendf(" MSAA: %i", msaa);
}
title.append("]");
GpuPathRenderers pr = fWindow->getRequestedDisplayParams().fGrContextOptions.fGpuPathRenderers;
if (GpuPathRenderers::kAll != pr) {
title.appendf(" [Path renderer: %s]", gPathRendererNames[pr].c_str());
}
if (kPerspective_Real == fPerspectiveMode) {
title.append(" Perpsective (Real)");
} else if (kPerspective_Fake == fPerspectiveMode) {
title.append(" Perspective (Fake)");
}
fWindow->setTitle(title.c_str());
}
int Viewer::startupSlide() const {
if (!FLAGS_slide.isEmpty()) {
int count = fSlides.count();
for (int i = 0; i < count; i++) {
if (fSlides[i]->getName().equals(FLAGS_slide[0])) {
return i;
}
}
fprintf(stderr, "Unknown slide \"%s\"\n", FLAGS_slide[0]);
this->listNames();
}
return 0;
}
void Viewer::listNames() const {
SkDebugf("All Slides:\n");
for (const auto& slide : fSlides) {
SkDebugf(" %s\n", slide->getName().c_str());
}
}
void Viewer::setCurrentSlide(int slide) {
SkASSERT(slide >= 0 && slide < fSlides.count());
if (slide == fCurrentSlide) {
return;
}
if (fCurrentSlide >= 0) {
fSlides[fCurrentSlide]->unload();
}
fSlides[slide]->load(SkIntToScalar(fWindow->width()),
SkIntToScalar(fWindow->height()));
fCurrentSlide = slide;
this->setupCurrentSlide();
}
void Viewer::setupCurrentSlide() {
if (fCurrentSlide >= 0) {
// prepare dimensions for image slides
fGesture.resetTouchState();
fDefaultMatrix.reset();
const SkISize slideSize = fSlides[fCurrentSlide]->getDimensions();
const SkRect slideBounds = SkRect::MakeIWH(slideSize.width(), slideSize.height());
const SkRect windowRect = SkRect::MakeIWH(fWindow->width(), fWindow->height());
// Start with a matrix that scales the slide to the available screen space
if (fWindow->scaleContentToFit()) {
if (windowRect.width() > 0 && windowRect.height() > 0) {
fDefaultMatrix.setRectToRect(slideBounds, windowRect, SkMatrix::kStart_ScaleToFit);
}
}
// Prevent the user from dragging content so far outside the window they can't find it again
fGesture.setTransLimit(slideBounds, windowRect, this->computePreTouchMatrix());
this->updateTitle();
this->updateUIState();
fStatsLayer.resetMeasurements();
fWindow->inval();
}
}
#define MAX_ZOOM_LEVEL 8
#define MIN_ZOOM_LEVEL -8
void Viewer::changeZoomLevel(float delta) {
fZoomLevel += delta;
fZoomLevel = SkScalarPin(fZoomLevel, MIN_ZOOM_LEVEL, MAX_ZOOM_LEVEL);
this->preTouchMatrixChanged();
}
void Viewer::preTouchMatrixChanged() {
// Update the trans limit as the transform changes.
const SkISize slideSize = fSlides[fCurrentSlide]->getDimensions();
const SkRect slideBounds = SkRect::MakeIWH(slideSize.width(), slideSize.height());
const SkRect windowRect = SkRect::MakeIWH(fWindow->width(), fWindow->height());
fGesture.setTransLimit(slideBounds, windowRect, this->computePreTouchMatrix());
}
SkMatrix Viewer::computePerspectiveMatrix() {
SkScalar w = fWindow->width(), h = fWindow->height();
SkPoint orthoPts[4] = { { 0, 0 }, { w, 0 }, { 0, h }, { w, h } };
SkPoint perspPts[4] = {
{ fPerspectivePoints[0].fX * w, fPerspectivePoints[0].fY * h },
{ fPerspectivePoints[1].fX * w, fPerspectivePoints[1].fY * h },
{ fPerspectivePoints[2].fX * w, fPerspectivePoints[2].fY * h },
{ fPerspectivePoints[3].fX * w, fPerspectivePoints[3].fY * h }
};
SkMatrix m;
m.setPolyToPoly(orthoPts, perspPts, 4);
return m;
}
SkMatrix Viewer::computePreTouchMatrix() {
SkMatrix m = fDefaultMatrix;
SkScalar zoomScale = (fZoomLevel < 0) ? SK_Scalar1 / (SK_Scalar1 - fZoomLevel)
: SK_Scalar1 + fZoomLevel;
m.preTranslate((fOffset.x() - 0.5f) * 2.0f, (fOffset.y() - 0.5f) * 2.0f);
m.preScale(zoomScale, zoomScale);
const SkISize slideSize = fSlides[fCurrentSlide]->getDimensions();
m.preRotate(fRotation, slideSize.width() * 0.5f, slideSize.height() * 0.5f);
if (kPerspective_Real == fPerspectiveMode) {
SkMatrix persp = this->computePerspectiveMatrix();
m.postConcat(persp);
}
return m;
}
SkMatrix Viewer::computeMatrix() {
SkMatrix m = fGesture.localM();
m.preConcat(fGesture.globalM());
m.preConcat(this->computePreTouchMatrix());
return m;
}
void Viewer::setBackend(sk_app::Window::BackendType backendType) {
fBackendType = backendType;
fWindow->detach();
#if defined(SK_BUILD_FOR_WIN)
// Switching between OpenGL, Vulkan, and ANGLE in the same window is problematic at this point
// on Windows, so we just delete the window and recreate it.
DisplayParams params = fWindow->getRequestedDisplayParams();
delete fWindow;
fWindow = Window::CreateNativeWindow(nullptr);
// re-register callbacks
fCommands.attach(fWindow);
fWindow->pushLayer(this);
fWindow->pushLayer(&fStatsLayer);
fWindow->pushLayer(&fImGuiLayer);
// Don't allow the window to re-attach. If we're in MSAA mode, the params we grabbed above
// will still include our correct sample count. But the re-created fWindow will lose that
// information. On Windows, we need to re-create the window when changing sample count,
// so we'll incorrectly detect that situation, then re-initialize the window in GL mode,
// rendering this tear-down step pointless (and causing the Vulkan window context to fail
// as if we had never changed windows at all).
fWindow->setRequestedDisplayParams(params, false);
#endif
fWindow->attach(backend_type_for_window(fBackendType));
}
void Viewer::setColorMode(ColorMode colorMode) {
fColorMode = colorMode;
this->updateTitle();
fWindow->inval();
}
class OveridePaintFilterCanvas : public SkPaintFilterCanvas {
public:
OveridePaintFilterCanvas(SkCanvas* canvas, SkPaint* paint, Viewer::SkPaintFields* pfields,
SkFont* font, Viewer::SkFontFields* ffields)
: SkPaintFilterCanvas(canvas), fPaint(paint), fPaintOverrides(pfields), fFont(font), fFontOverrides(ffields)
{ }
const SkTextBlob* filterTextBlob(const SkPaint& paint, const SkTextBlob* blob,
sk_sp<SkTextBlob>* cache) {
bool blobWillChange = false;
for (SkTextBlobRunIterator it(blob); !it.done(); it.next()) {
SkTCopyOnFirstWrite<SkFont> filteredFont(it.font());
bool shouldDraw = this->filterFont(&filteredFont);
if (it.font() != *filteredFont || !shouldDraw) {
blobWillChange = true;
break;
}
}
if (!blobWillChange) {
return blob;
}
SkTextBlobBuilder builder;
for (SkTextBlobRunIterator it(blob); !it.done(); it.next()) {
SkTCopyOnFirstWrite<SkFont> filteredFont(it.font());
bool shouldDraw = this->filterFont(&filteredFont);
if (!shouldDraw) {
continue;
}
SkFont font = *filteredFont;
const SkTextBlobBuilder::RunBuffer& runBuffer
= it.positioning() == SkTextBlobRunIterator::kDefault_Positioning
? SkTextBlobBuilderPriv::AllocRunText(&builder, font,
it.offset().x(),it.offset().y(), it.glyphCount(), it.textSize(), SkString())
: it.positioning() == SkTextBlobRunIterator::kHorizontal_Positioning
? SkTextBlobBuilderPriv::AllocRunTextPosH(&builder, font,
it.offset().y(), it.glyphCount(), it.textSize(), SkString())
: it.positioning() == SkTextBlobRunIterator::kFull_Positioning
? SkTextBlobBuilderPriv::AllocRunTextPos(&builder, font,
it.glyphCount(), it.textSize(), SkString())
: (SkASSERT_RELEASE(false), SkTextBlobBuilder::RunBuffer());
uint32_t glyphCount = it.glyphCount();
if (it.glyphs()) {
size_t glyphSize = sizeof(decltype(*it.glyphs()));
memcpy(runBuffer.glyphs, it.glyphs(), glyphCount * glyphSize);
}
if (it.pos()) {
size_t posSize = sizeof(decltype(*it.pos()));
uint8_t positioning = it.positioning();
memcpy(runBuffer.pos, it.pos(), glyphCount * positioning * posSize);
}
if (it.text()) {
size_t textSize = sizeof(decltype(*it.text()));
uint32_t textCount = it.textSize();
memcpy(runBuffer.utf8text, it.text(), textCount * textSize);
}
if (it.clusters()) {
size_t clusterSize = sizeof(decltype(*it.clusters()));
memcpy(runBuffer.clusters, it.clusters(), glyphCount * clusterSize);
}
}
*cache = builder.make();
return cache->get();
}
void onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
const SkPaint& paint) override {
sk_sp<SkTextBlob> cache;
this->SkPaintFilterCanvas::onDrawTextBlob(
this->filterTextBlob(paint, blob, &cache), x, y, paint);
}
bool filterFont(SkTCopyOnFirstWrite<SkFont>* font) const {
if (fFontOverrides->fTextSize) {
font->writable()->setSize(fFont->getSize());
}
if (fFontOverrides->fHinting) {
font->writable()->setHinting(fFont->getHinting());
}
if (fFontOverrides->fEdging) {
font->writable()->setEdging(fFont->getEdging());
}
if (fFontOverrides->fEmbolden) {
font->writable()->setEmbolden(fFont->isEmbolden());
}
if (fFontOverrides->fLinearMetrics) {
font->writable()->setLinearMetrics(fFont->isLinearMetrics());
}
if (fFontOverrides->fSubpixel) {
font->writable()->setSubpixel(fFont->isSubpixel());
}
if (fFontOverrides->fEmbeddedBitmaps) {
font->writable()->setEmbeddedBitmaps(fFont->isEmbeddedBitmaps());
}
if (fFontOverrides->fForceAutoHinting) {
font->writable()->setForceAutoHinting(fFont->isForceAutoHinting());
}
return true;
}
bool onFilter(SkTCopyOnFirstWrite<SkPaint>* paint, Type) const override {
if (*paint == nullptr) {
return true;
}
if (fPaintOverrides->fAntiAlias) {
paint->writable()->setAntiAlias(fPaint->isAntiAlias());
}
if (fPaintOverrides->fDither) {
paint->writable()->setDither(fPaint->isDither());
}
return true;
}
SkPaint* fPaint;
Viewer::SkPaintFields* fPaintOverrides;
SkFont* fFont;
Viewer::SkFontFields* fFontOverrides;
};
void Viewer::drawSlide(SkCanvas* canvas) {
SkAutoCanvasRestore autorestore(canvas, false);
// By default, we render directly into the window's surface/canvas
SkCanvas* slideCanvas = canvas;
fLastImage.reset();
// If we're in any of the color managed modes, construct the color space we're going to use
sk_sp<SkColorSpace> colorSpace = nullptr;
if (ColorMode::kLegacy != fColorMode) {
skcms_Matrix3x3 toXYZ;
SkAssertResult(fColorSpacePrimaries.toXYZD50(&toXYZ));
colorSpace = SkColorSpace::MakeRGB(fColorSpaceTransferFn, toXYZ);
}
if (fSaveToSKP) {
SkPictureRecorder recorder;
SkCanvas* recorderCanvas = recorder.beginRecording(
SkRect::Make(fSlides[fCurrentSlide]->getDimensions()));
fSlides[fCurrentSlide]->draw(recorderCanvas);
sk_sp<SkPicture> picture(recorder.finishRecordingAsPicture());
SkFILEWStream stream("sample_app.skp");
picture->serialize(&stream);
fSaveToSKP = false;
}
// Grab some things we'll need to make surfaces (for tiling or general offscreen rendering)
SkColorType colorType = (ColorMode::kColorManagedF16 == fColorMode) ? kRGBA_F16_SkColorType
: kN32_SkColorType;
SkSurfaceProps props(SkSurfaceProps::kLegacyFontHost_InitType);
canvas->getProps(&props);
auto make_surface = [=](int w, int h) {
SkImageInfo info = SkImageInfo::Make(w, h, colorType, kPremul_SkAlphaType, colorSpace);
return Window::kRaster_BackendType == this->fBackendType
? SkSurface::MakeRaster(info, &props)
: canvas->makeSurface(info, &props);
};
// We need to render offscreen if we're...
// ... in fake perspective or zooming (so we have a snapped copy of the results)
// ... in any raster mode, because the window surface is actually GL
// ... in any color managed mode, because we always make the window surface with no color space
sk_sp<SkSurface> offscreenSurface = nullptr;
if (kPerspective_Fake == fPerspectiveMode ||
fShowZoomWindow ||
Window::kRaster_BackendType == fBackendType ||
colorSpace != nullptr) {
offscreenSurface = make_surface(fWindow->width(), fWindow->height());
slideCanvas = offscreenSurface->getCanvas();
}
int count = slideCanvas->save();
slideCanvas->clear(SK_ColorWHITE);
// Time the painting logic of the slide
fStatsLayer.beginTiming(fPaintTimer);
if (fTiled) {
int tileW = SkScalarCeilToInt(fWindow->width() * fTileScale.width());
int tileH = SkScalarCeilToInt(fWindow->height() * fTileScale.height());
sk_sp<SkSurface> tileSurface = make_surface(tileW, tileH);
SkCanvas* tileCanvas = tileSurface->getCanvas();
SkMatrix m = this->computeMatrix();
for (int y = 0; y < fWindow->height(); y += tileH) {
for (int x = 0; x < fWindow->width(); x += tileW) {
SkAutoCanvasRestore acr(tileCanvas, true);
tileCanvas->translate(-x, -y);
tileCanvas->clear(SK_ColorTRANSPARENT);
tileCanvas->concat(m);
OveridePaintFilterCanvas filterCanvas(tileCanvas, &fPaint, &fPaintOverrides,
&fFont, &fFontOverrides);
fSlides[fCurrentSlide]->draw(&filterCanvas);
tileSurface->draw(slideCanvas, x, y, nullptr);
}
}
// Draw borders between tiles
if (fDrawTileBoundaries) {
SkPaint border;
border.setColor(0x60FF00FF);
border.setStyle(SkPaint::kStroke_Style);
for (int y = 0; y < fWindow->height(); y += tileH) {
for (int x = 0; x < fWindow->width(); x += tileW) {
slideCanvas->drawRect(SkRect::MakeXYWH(x, y, tileW, tileH), border);
}
}
}
} else {
slideCanvas->concat(this->computeMatrix());
if (kPerspective_Real == fPerspectiveMode) {
slideCanvas->clipRect(SkRect::MakeWH(fWindow->width(), fWindow->height()));
}
OveridePaintFilterCanvas filterCanvas(slideCanvas, &fPaint, &fPaintOverrides, &fFont, &fFontOverrides);
fSlides[fCurrentSlide]->draw(&filterCanvas);
}
fStatsLayer.endTiming(fPaintTimer);
slideCanvas->restoreToCount(count);
// Force a flush so we can time that, too
fStatsLayer.beginTiming(fFlushTimer);
slideCanvas->flush();
fStatsLayer.endTiming(fFlushTimer);
// If we rendered offscreen, snap an image and push the results to the window's canvas
if (offscreenSurface) {
fLastImage = offscreenSurface->makeImageSnapshot();
SkPaint paint;
paint.setBlendMode(SkBlendMode::kSrc);
int prePerspectiveCount = canvas->save();
if (kPerspective_Fake == fPerspectiveMode) {
paint.setFilterQuality(kHigh_SkFilterQuality);
canvas->clear(SK_ColorWHITE);
canvas->concat(this->computePerspectiveMatrix());
}
canvas->drawImage(fLastImage, 0, 0, &paint);
canvas->restoreToCount(prePerspectiveCount);
}
}
void Viewer::onBackendCreated() {
this->setupCurrentSlide();
fWindow->show();
}
void Viewer::onPaint(SkCanvas* canvas) {
this->drawSlide(canvas);
fCommands.drawHelp(canvas);
this->drawImGui();
if (GrContext* ctx = fWindow->getGrContext()) {
// Clean out cache items that haven't been used in more than 10 seconds.
ctx->performDeferredCleanup(std::chrono::seconds(10));
}
}
void Viewer::onResize(int width, int height) {
if (fCurrentSlide >= 0) {
fSlides[fCurrentSlide]->resize(width, height);
}
}
SkPoint Viewer::mapEvent(float x, float y) {
const auto m = this->computeMatrix();
SkMatrix inv;
SkAssertResult(m.invert(&inv));
return inv.mapXY(x, y);
}
bool Viewer::onTouch(intptr_t owner, Window::InputState state, float x, float y) {
if (GestureDevice::kMouse == fGestureDevice) {
return false;
}
const auto slidePt = this->mapEvent(x, y);
if (fSlides[fCurrentSlide]->onMouse(slidePt.x(), slidePt.y(), state, 0)) {
fWindow->inval();
return true;
}
void* castedOwner = reinterpret_cast<void*>(owner);
switch (state) {
case Window::kUp_InputState: {
fGesture.touchEnd(castedOwner);
#if defined(SK_BUILD_FOR_IOS)
// TODO: move IOS swipe detection higher up into the platform code
SkPoint dir;
if (fGesture.isFling(&dir)) {
// swiping left or right
if (SkTAbs(dir.fX) > SkTAbs(dir.fY)) {
if (dir.fX < 0) {
this->setCurrentSlide(fCurrentSlide < fSlides.count() - 1 ?
fCurrentSlide + 1 : 0);
} else {
this->setCurrentSlide(fCurrentSlide > 0 ?
fCurrentSlide - 1 : fSlides.count() - 1);
}
}
fGesture.reset();
}
#endif
break;
}
case Window::kDown_InputState: {
fGesture.touchBegin(castedOwner, x, y);
break;
}
case Window::kMove_InputState: {
fGesture.touchMoved(castedOwner, x, y);
break;
}
}
fGestureDevice = fGesture.isBeingTouched() ? GestureDevice::kTouch : GestureDevice::kNone;
fWindow->inval();
return true;
}
bool Viewer::onMouse(int x, int y, Window::InputState state, uint32_t modifiers) {
if (GestureDevice::kTouch == fGestureDevice) {
return false;
}
const auto slidePt = this->mapEvent(x, y);
if (fSlides[fCurrentSlide]->onMouse(slidePt.x(), slidePt.y(), state, modifiers)) {
fWindow->inval();
return true;
}
switch (state) {
case Window::kUp_InputState: {
fGesture.touchEnd(nullptr);
break;
}
case Window::kDown_InputState: {
fGesture.touchBegin(nullptr, x, y);
break;
}
case Window::kMove_InputState: {
fGesture.touchMoved(nullptr, x, y);
break;
}
}
fGestureDevice = fGesture.isBeingTouched() ? GestureDevice::kMouse : GestureDevice::kNone;
if (state != Window::kMove_InputState || fGesture.isBeingTouched()) {
fWindow->inval();
}
return true;
}
static void ImGui_Primaries(SkColorSpacePrimaries* primaries, SkPaint* gamutPaint) {
// The gamut image covers a (0.8 x 0.9) shaped region
ImGui::DragCanvas dc(primaries, { 0.0f, 0.9f }, { 0.8f, 0.0f });
// Background image. Only draw a subset of the image, to avoid the regions less than zero.
// Simplifes re-mapping math, clipping behavior, and increases resolution in the useful area.
// Magic numbers are pixel locations of the origin and upper-right corner.
dc.fDrawList->AddImage(gamutPaint, dc.fPos,
ImVec2(dc.fPos.x + dc.fSize.x, dc.fPos.y + dc.fSize.y),
ImVec2(242, 61), ImVec2(1897, 1922));
dc.dragPoint((SkPoint*)(&primaries->fRX), true, 0xFF000040);
dc.dragPoint((SkPoint*)(&primaries->fGX), true, 0xFF004000);
dc.dragPoint((SkPoint*)(&primaries->fBX), true, 0xFF400000);
dc.dragPoint((SkPoint*)(&primaries->fWX), true);
dc.fDrawList->AddPolyline(dc.fScreenPoints.begin(), 3, 0xFFFFFFFF, true, 1.5f);
}
static bool ImGui_DragLocation(SkPoint* pt) {
ImGui::DragCanvas dc(pt);
dc.fillColor(IM_COL32(0, 0, 0, 128));
dc.dragPoint(pt);
return dc.fDragging;
}
static bool ImGui_DragQuad(SkPoint* pts) {
ImGui::DragCanvas dc(pts);
dc.fillColor(IM_COL32(0, 0, 0, 128));
for (int i = 0; i < 4; ++i) {
dc.dragPoint(pts + i);
}
dc.fDrawList->AddLine(dc.fScreenPoints[0], dc.fScreenPoints[1], 0xFFFFFFFF);
dc.fDrawList->AddLine(dc.fScreenPoints[1], dc.fScreenPoints[3], 0xFFFFFFFF);
dc.fDrawList->AddLine(dc.fScreenPoints[3], dc.fScreenPoints[2], 0xFFFFFFFF);
dc.fDrawList->AddLine(dc.fScreenPoints[2], dc.fScreenPoints[0], 0xFFFFFFFF);
return dc.fDragging;
}
void Viewer::drawImGui() {
// Support drawing the ImGui demo window. Superfluous, but gives a good idea of what's possible
if (fShowImGuiTestWindow) {
ImGui::ShowDemoWindow(&fShowImGuiTestWindow);
}
if (fShowImGuiDebugWindow) {
// We have some dynamic content that sizes to fill available size. If the scroll bar isn't
// always visible, we can end up in a layout feedback loop.
ImGui::SetNextWindowSize(ImVec2(400, 400), ImGuiCond_FirstUseEver);
DisplayParams params = fWindow->getRequestedDisplayParams();
bool paramsChanged = false;
if (ImGui::Begin("Tools", &fShowImGuiDebugWindow,
ImGuiWindowFlags_AlwaysVerticalScrollbar)) {
if (ImGui::CollapsingHeader("Backend")) {
int newBackend = static_cast<int>(fBackendType);
ImGui::RadioButton("Raster", &newBackend, sk_app::Window::kRaster_BackendType);
ImGui::SameLine();
ImGui::RadioButton("OpenGL", &newBackend, sk_app::Window::kNativeGL_BackendType);
#if SK_ANGLE && defined(SK_BUILD_FOR_WIN)
ImGui::SameLine();
ImGui::RadioButton("ANGLE", &newBackend, sk_app::Window::kANGLE_BackendType);
#endif
#if defined(SK_VULKAN)
ImGui::SameLine();
ImGui::RadioButton("Vulkan", &newBackend, sk_app::Window::kVulkan_BackendType);
#endif
#if defined(SK_METAL) && defined(SK_BUILD_FOR_MAC)
ImGui::SameLine();
ImGui::RadioButton("Metal", &newBackend, sk_app::Window::kMetal_BackendType);
#endif
if (newBackend != fBackendType) {
fDeferredActions.push_back([=]() {
this->setBackend(static_cast<sk_app::Window::BackendType>(newBackend));
});
}
const GrContext* ctx = fWindow->getGrContext();
bool* wire = &params.fGrContextOptions.fWireframeMode;
if (ctx && ImGui::Checkbox("Wireframe Mode", wire)) {
paramsChanged = true;
}
if (ctx) {
int sampleCount = fWindow->sampleCount();
ImGui::Text("MSAA: "); ImGui::SameLine();
ImGui::RadioButton("1", &sampleCount, 1); ImGui::SameLine();
ImGui::RadioButton("4", &sampleCount, 4); ImGui::SameLine();
ImGui::RadioButton("8", &sampleCount, 8); ImGui::SameLine();
ImGui::RadioButton("16", &sampleCount, 16);
if (sampleCount != params.fMSAASampleCount) {
params.fMSAASampleCount = sampleCount;
paramsChanged = true;
}
}
int pixelGeometryIdx = 0;
if (fPixelGeometryOverrides) {
pixelGeometryIdx = params.fSurfaceProps.pixelGeometry() + 1;
}
if (ImGui::Combo("Pixel Geometry", &pixelGeometryIdx,
"Default\0Flat\0RGB\0BGR\0RGBV\0BGRV\0\0"))
{
uint32_t flags = params.fSurfaceProps.flags();
if (pixelGeometryIdx == 0) {
fPixelGeometryOverrides = false;
params.fSurfaceProps = SkSurfaceProps(flags, SkSurfaceProps::kLegacyFontHost_InitType);
} else {
fPixelGeometryOverrides = true;
SkPixelGeometry pixelGeometry = SkTo<SkPixelGeometry>(pixelGeometryIdx - 1);
params.fSurfaceProps = SkSurfaceProps(flags, pixelGeometry);
}
paramsChanged = true;
}
bool useDFT = params.fSurfaceProps.isUseDeviceIndependentFonts();
if (ImGui::Checkbox("DFT", &useDFT)) {
uint32_t flags = params.fSurfaceProps.flags();
if (useDFT) {
flags |= SkSurfaceProps::kUseDeviceIndependentFonts_Flag;
} else {
flags &= ~SkSurfaceProps::kUseDeviceIndependentFonts_Flag;
}
SkPixelGeometry pixelGeometry = params.fSurfaceProps.pixelGeometry();
params.fSurfaceProps = SkSurfaceProps(flags, pixelGeometry);
paramsChanged = true;
}
if (ImGui::TreeNode("Path Renderers")) {
GpuPathRenderers prevPr = params.fGrContextOptions.fGpuPathRenderers;
auto prButton = [&](GpuPathRenderers x) {
if (ImGui::RadioButton(gPathRendererNames[x].c_str(), prevPr == x)) {
if (x != params.fGrContextOptions.fGpuPathRenderers) {
params.fGrContextOptions.fGpuPathRenderers = x;
paramsChanged = true;
}
}
};
if (!ctx) {
ImGui::RadioButton("Software", true);
} else if (fWindow->sampleCount() > 1) {
prButton(GpuPathRenderers::kAll);
if (ctx->priv().caps()->shaderCaps()->pathRenderingSupport()) {
prButton(GpuPathRenderers::kStencilAndCover);
}
prButton(GpuPathRenderers::kTessellating);
prButton(GpuPathRenderers::kNone);
} else {
prButton(GpuPathRenderers::kAll);
if (GrCoverageCountingPathRenderer::IsSupported(
*ctx->priv().caps())) {
prButton(GpuPathRenderers::kCoverageCounting);
}
prButton(GpuPathRenderers::kSmall);
prButton(GpuPathRenderers::kTessellating);
prButton(GpuPathRenderers::kNone);
}
ImGui::TreePop();
}
}
if (ImGui::CollapsingHeader("Transform")) {
float zoom = fZoomLevel;
if (ImGui::SliderFloat("Zoom", &zoom, MIN_ZOOM_LEVEL, MAX_ZOOM_LEVEL)) {
fZoomLevel = zoom;
this->preTouchMatrixChanged();
paramsChanged = true;
}
float deg = fRotation;
if (ImGui::SliderFloat("Rotate", &deg, -30, 360, "%.3f deg")) {
fRotation = deg;
this->preTouchMatrixChanged();
paramsChanged = true;
}
if (ImGui::CollapsingHeader("Subpixel offset", ImGuiTreeNodeFlags_NoTreePushOnOpen)) {
if (ImGui_DragLocation(&fOffset)) {
this->preTouchMatrixChanged();
paramsChanged = true;
}
} else if (fOffset != SkVector{0.5f, 0.5f}) {
this->preTouchMatrixChanged();
paramsChanged = true;
fOffset = {0.5f, 0.5f};
}
if (ImGui::CollapsingHeader("Tiling")) {
ImGui::Checkbox("Enable", &fTiled);
ImGui::Checkbox("Draw Boundaries", &fDrawTileBoundaries);
ImGui::SliderFloat("Horizontal", &fTileScale.fWidth, 0.1f, 1.0f);
ImGui::SliderFloat("Vertical", &fTileScale.fHeight, 0.1f, 1.0f);
}
int perspectiveMode = static_cast<int>(fPerspectiveMode);
if (ImGui::Combo("Perspective", &perspectiveMode, "Off\0Real\0Fake\0\0")) {
fPerspectiveMode = static_cast<PerspectiveMode>(perspectiveMode);
this->preTouchMatrixChanged();
paramsChanged = true;
}
if (perspectiveMode != kPerspective_Off && ImGui_DragQuad(fPerspectivePoints)) {
this->preTouchMatrixChanged();
paramsChanged = true;
}
}
if (ImGui::CollapsingHeader("Paint")) {
int aliasIdx = 0;
if (fPaintOverrides.fAntiAlias) {
aliasIdx = SkTo<int>(fPaintOverrides.fAntiAliasState) + 1;
}
if (ImGui::Combo("Anti-Alias", &aliasIdx,
"Default\0Alias\0Normal\0AnalyticAAEnabled\0AnalyticAAForced\0"
"DeltaAAEnabled\0DeltaAAForced\0\0"))
{
gSkUseAnalyticAA = fPaintOverrides.fOriginalSkUseAnalyticAA;
gSkForceAnalyticAA = fPaintOverrides.fOriginalSkForceAnalyticAA;
gSkUseDeltaAA = fPaintOverrides.fOriginalSkUseDeltaAA;
gSkForceDeltaAA = fPaintOverrides.fOriginalSkForceDeltaAA;
if (aliasIdx == 0) {
fPaintOverrides.fAntiAliasState = SkPaintFields::AntiAliasState::Alias;
fPaintOverrides.fAntiAlias = false;
} else {
fPaintOverrides.fAntiAlias = true;
fPaintOverrides.fAntiAliasState = SkTo<SkPaintFields::AntiAliasState>(aliasIdx-1);
fPaint.setAntiAlias(aliasIdx > 1);
switch (fPaintOverrides.fAntiAliasState) {
case SkPaintFields::AntiAliasState::Alias:
break;
case SkPaintFields::AntiAliasState::Normal:
break;
case SkPaintFields::AntiAliasState::AnalyticAAEnabled:
gSkUseAnalyticAA = true;
gSkForceAnalyticAA = false;
gSkUseDeltaAA = gSkForceDeltaAA = false;
break;
case SkPaintFields::AntiAliasState::AnalyticAAForced:
gSkUseAnalyticAA = gSkForceAnalyticAA = true;
gSkUseDeltaAA = gSkForceDeltaAA = false;
break;
case SkPaintFields::AntiAliasState::DeltaAAEnabled:
gSkUseAnalyticAA = gSkForceAnalyticAA = false;
gSkUseDeltaAA = true;
gSkForceDeltaAA = false;
break;
case SkPaintFields::AntiAliasState::DeltaAAForced:
gSkUseAnalyticAA = gSkForceAnalyticAA = false;
gSkUseDeltaAA = gSkForceDeltaAA = true;
break;
}
}
paramsChanged = true;
}
auto paintFlag = [this, &paramsChanged](const char* label, const char* items,
bool SkPaintFields::* flag,
bool (SkPaint::* isFlag)() const,
void (SkPaint::* setFlag)(bool) )
{
int itemIndex = 0;
if (fPaintOverrides.*flag) {
itemIndex = (fPaint.*isFlag)() ? 2 : 1;
}
if (ImGui::Combo(label, &itemIndex, items)) {
if (itemIndex == 0) {
fPaintOverrides.*flag = false;
} else {
fPaintOverrides.*flag = true;
(fPaint.*setFlag)(itemIndex == 2);
}
paramsChanged = true;
}
};
paintFlag("Dither",
"Default\0No Dither\0Dither\0\0",
&SkPaintFields::fDither,
&SkPaint::isDither, &SkPaint::setDither);
}
if (ImGui::CollapsingHeader("Font")) {
int hintingIdx = 0;
if (fFontOverrides.fHinting) {
hintingIdx = SkTo<int>(fFont.getHinting()) + 1;
}
if (ImGui::Combo("Hinting", &hintingIdx,
"Default\0None\0Slight\0Normal\0Full\0\0"))
{
if (hintingIdx == 0) {
fFontOverrides.fHinting = false;
fFont.setHinting(kNo_SkFontHinting);
} else {
fFont.setHinting(SkTo<SkFontHinting>(hintingIdx - 1));
fFontOverrides.fHinting = true;
}
paramsChanged = true;
}
auto fontFlag = [this, &paramsChanged](const char* label, const char* items,
bool SkFontFields::* flag,
bool (SkFont::* isFlag)() const,
void (SkFont::* setFlag)(bool) )
{
int itemIndex = 0;
if (fFontOverrides.*flag) {
itemIndex = (fFont.*isFlag)() ? 2 : 1;
}
if (ImGui::Combo(label, &itemIndex, items)) {
if (itemIndex == 0) {
fFontOverrides.*flag = false;
} else {
fFontOverrides.*flag = true;
(fFont.*setFlag)(itemIndex == 2);
}
paramsChanged = true;
}
};
fontFlag("Fake Bold Glyphs",
"Default\0No Fake Bold\0Fake Bold\0\0",
&SkFontFields::fEmbolden,
&SkFont::isEmbolden, &SkFont::setEmbolden);
fontFlag("Linear Text",
"Default\0No Linear Text\0Linear Text\0\0",
&SkFontFields::fLinearMetrics,
&SkFont::isLinearMetrics, &SkFont::setLinearMetrics);
fontFlag("Subpixel Position Glyphs",
"Default\0Pixel Text\0Subpixel Text\0\0",
&SkFontFields::fSubpixel,
&SkFont::isSubpixel, &SkFont::setSubpixel);
fontFlag("Embedded Bitmap Text",
"Default\0No Embedded Bitmaps\0Embedded Bitmaps\0\0",
&SkFontFields::fEmbeddedBitmaps,
&SkFont::isEmbeddedBitmaps, &SkFont::setEmbeddedBitmaps);
fontFlag("Force Auto-Hinting",
"Default\0No Force Auto-Hinting\0Force Auto-Hinting\0\0",
&SkFontFields::fForceAutoHinting,
&SkFont::isForceAutoHinting, &SkFont::setForceAutoHinting);
int edgingIdx = 0;
if (fFontOverrides.fEdging) {
edgingIdx = SkTo<int>(fFont.getEdging()) + 1;
}
if (ImGui::Combo("Edging", &edgingIdx,
"Default\0Alias\0Antialias\0Subpixel Antialias\0\0"))
{
if (edgingIdx == 0) {
fFontOverrides.fEdging = false;
fFont.setEdging(SkFont::Edging::kAlias);
} else {
fFont.setEdging(SkTo<SkFont::Edging>(edgingIdx-1));
fFontOverrides.fEdging = true;
}
paramsChanged = true;
}
ImGui::Checkbox("Override TextSize", &fFontOverrides.fTextSize);
if (fFontOverrides.fTextSize) {
ImGui::DragFloat2("TextRange", fFontOverrides.fTextSizeRange,
0.001f, -10.0f, 300.0f, "%.6f", 2.0f);
float textSize = fFont.getSize();
if (ImGui::DragFloat("TextSize", &textSize, 0.001f,
fFontOverrides.fTextSizeRange[0],
fFontOverrides.fTextSizeRange[1],
"%.6f", 2.0f))
{
fFont.setSize(textSize);
this->preTouchMatrixChanged();
paramsChanged = true;
}
}
}
{
SkMetaData controls;
if (fSlides[fCurrentSlide]->onGetControls(&controls)) {
if (ImGui::CollapsingHeader("Current Slide")) {
SkMetaData::Iter iter(controls);
const char* name;
SkMetaData::Type type;
int count;
while ((name = iter.next(&type, &count)) != nullptr) {
if (type == SkMetaData::kScalar_Type) {
float val[3];
SkASSERT(count == 3);
controls.findScalars(name, &count, val);
if (ImGui::SliderFloat(name, &val[0], val[1], val[2])) {
controls.setScalars(name, 3, val);
}
}
}
fSlides[fCurrentSlide]->onSetControls(controls);
}
}
}
if (fShowSlidePicker) {
ImGui::SetNextTreeNodeOpen(true);
}
if (ImGui::CollapsingHeader("Slide")) {
static ImGuiTextFilter filter;
static ImVector<const char*> filteredSlideNames;
static ImVector<int> filteredSlideIndices;
if (fShowSlidePicker) {
ImGui::SetKeyboardFocusHere();
fShowSlidePicker = false;
}
filter.Draw();
filteredSlideNames.clear();
filteredSlideIndices.clear();
int filteredIndex = 0;
for (int i = 0; i < fSlides.count(); ++i) {
const char* slideName = fSlides[i]->getName().c_str();
if (filter.PassFilter(slideName) || i == fCurrentSlide) {
if (i == fCurrentSlide) {
filteredIndex = filteredSlideIndices.size();
}
filteredSlideNames.push_back(slideName);
filteredSlideIndices.push_back(i);
}
}
if (ImGui::ListBox("", &filteredIndex, filteredSlideNames.begin(),
filteredSlideNames.size(), 20)) {
this->setCurrentSlide(filteredSlideIndices[filteredIndex]);
}
}
if (ImGui::CollapsingHeader("Color Mode")) {
ColorMode newMode = fColorMode;
auto cmButton = [&](ColorMode mode, const char* label) {
if (ImGui::RadioButton(label, mode == fColorMode)) {
newMode = mode;
}
};
cmButton(ColorMode::kLegacy, "Legacy 8888");
cmButton(ColorMode::kColorManaged8888, "Color Managed 8888");
cmButton(ColorMode::kColorManagedF16, "Color Managed F16");
if (newMode != fColorMode) {
this->setColorMode(newMode);
}
// Pick from common gamuts:
int primariesIdx = 4; // Default: Custom
for (size_t i = 0; i < SK_ARRAY_COUNT(gNamedPrimaries); ++i) {
if (primaries_equal(*gNamedPrimaries[i].fPrimaries, fColorSpacePrimaries)) {
primariesIdx = i;
break;
}
}
// Let user adjust the gamma
ImGui::SliderFloat("Gamma", &fColorSpaceTransferFn.g, 0.5f, 3.5f);
if (ImGui::Combo("Primaries", &primariesIdx,
"sRGB\0AdobeRGB\0P3\0Rec. 2020\0Custom\0\0")) {
if (primariesIdx >= 0 && primariesIdx <= 3) {
fColorSpacePrimaries = *gNamedPrimaries[primariesIdx].fPrimaries;
}
}
// Allow direct editing of gamut
ImGui_Primaries(&fColorSpacePrimaries, &fImGuiGamutPaint);
}
if (ImGui::CollapsingHeader("Animation")) {
bool isPaused = fAnimTimer.isPaused();
if (ImGui::Checkbox("Pause", &isPaused)) {
fAnimTimer.togglePauseResume();
}
float speed = fAnimTimer.getSpeed();
if (ImGui::DragFloat("Speed", &speed, 0.1f)) {
fAnimTimer.setSpeed(speed);
}
}
}
if (paramsChanged) {
fDeferredActions.push_back([=]() {
fWindow->setRequestedDisplayParams(params);
fWindow->inval();
this->updateTitle();
});
}
ImGui::End();
}
if (fShowZoomWindow && fLastImage) {
ImGui::SetNextWindowSize(ImVec2(200, 200), ImGuiCond_FirstUseEver);
if (ImGui::Begin("Zoom", &fShowZoomWindow)) {
static int zoomFactor = 8;
if (ImGui::Button("<<")) {
zoomFactor = SkTMax(zoomFactor / 2, 4);
}
ImGui::SameLine(); ImGui::Text("%2d", zoomFactor); ImGui::SameLine();
if (ImGui::Button(">>")) {
zoomFactor = SkTMin(zoomFactor * 2, 32);
}
if (!fZoomWindowFixed) {
ImVec2 mousePos = ImGui::GetMousePos();
fZoomWindowLocation = SkPoint::Make(mousePos.x, mousePos.y);
}
SkScalar x = fZoomWindowLocation.x();
SkScalar y = fZoomWindowLocation.y();
int xInt = SkScalarRoundToInt(x);
int yInt = SkScalarRoundToInt(y);
ImVec2 avail = ImGui::GetContentRegionAvail();
uint32_t pixel = 0;
SkImageInfo info = SkImageInfo::MakeN32Premul(1, 1);
if (fLastImage->readPixels(info, &pixel, info.minRowBytes(), xInt, yInt)) {
ImGui::SameLine();
ImGui::Text("(X, Y): %d, %d RGBA: %x %x %x %x",
xInt, yInt,
SkGetPackedR32(pixel), SkGetPackedG32(pixel),
SkGetPackedB32(pixel), SkGetPackedA32(pixel));
}
fImGuiLayer.skiaWidget(avail, [=](SkCanvas* c) {
// Translate so the region of the image that's under the mouse cursor is centered
// in the zoom canvas:
c->scale(zoomFactor, zoomFactor);
c->translate(avail.x * 0.5f / zoomFactor - x - 0.5f,
avail.y * 0.5f / zoomFactor - y - 0.5f);
c->drawImage(this->fLastImage, 0, 0);
SkPaint outline;
outline.setStyle(SkPaint::kStroke_Style);
c->drawRect(SkRect::MakeXYWH(x, y, 1, 1), outline);
});
}
ImGui::End();
}
}
void Viewer::onIdle() {
for (int i = 0; i < fDeferredActions.count(); ++i) {
fDeferredActions[i]();
}
fDeferredActions.reset();
fStatsLayer.beginTiming(fAnimateTimer);
fAnimTimer.updateTime();
bool animateWantsInval = fSlides[fCurrentSlide]->animate(fAnimTimer);
fStatsLayer.endTiming(fAnimateTimer);
ImGuiIO& io = ImGui::GetIO();
// ImGui always has at least one "active" window, which is the default "Debug" window. It may
// not be visible, though. So we need to redraw if there is at least one visible window, or
// more than one active window. Newly created windows are active but not visible for one frame
// while they determine their layout and sizing.
if (animateWantsInval || fStatsLayer.getActive() || fRefresh ||
io.MetricsActiveWindows > 1 || io.MetricsRenderWindows > 0) {
fWindow->inval();
}
}
template <typename OptionsFunc>
static void WriteStateObject(SkJSONWriter& writer, const char* name, const char* value,
OptionsFunc&& optionsFunc) {
writer.beginObject();
{
writer.appendString(kName , name);
writer.appendString(kValue, value);
writer.beginArray(kOptions);
{
optionsFunc(writer);
}
writer.endArray();
}
writer.endObject();
}
void Viewer::updateUIState() {
if (!fWindow) {
return;
}
if (fWindow->sampleCount() < 1) {
return; // Surface hasn't been created yet.
}
SkDynamicMemoryWStream memStream;
SkJSONWriter writer(&memStream);
writer.beginArray();
// Slide state
WriteStateObject(writer, kSlideStateName, fSlides[fCurrentSlide]->getName().c_str(),
[this](SkJSONWriter& writer) {
for(const auto& slide : fSlides) {
writer.appendString(slide->getName().c_str());
}
});
// Backend state
WriteStateObject(writer, kBackendStateName, kBackendTypeStrings[fBackendType],
[](SkJSONWriter& writer) {
for (const auto& str : kBackendTypeStrings) {
writer.appendString(str);
}
});
// MSAA state
const auto countString = SkStringPrintf("%d", fWindow->sampleCount());
WriteStateObject(writer, kMSAAStateName, countString.c_str(),
[this](SkJSONWriter& writer) {
writer.appendS32(0);
if (sk_app::Window::kRaster_BackendType == fBackendType) {
return;
}
for (int msaa : {4, 8, 16}) {
writer.appendS32(msaa);
}
});
// Path renderer state
GpuPathRenderers pr = fWindow->getRequestedDisplayParams().fGrContextOptions.fGpuPathRenderers;
WriteStateObject(writer, kPathRendererStateName, gPathRendererNames[pr].c_str(),
[this](SkJSONWriter& writer) {
const GrContext* ctx = fWindow->getGrContext();
if (!ctx) {
writer.appendString("Software");
} else {
const auto* caps = ctx->priv().caps();
writer.appendString(gPathRendererNames[GpuPathRenderers::kAll].c_str());
if (fWindow->sampleCount() > 1) {
if (caps->shaderCaps()->pathRenderingSupport()) {
writer.appendString(
gPathRendererNames[GpuPathRenderers::kStencilAndCover].c_str());
}
} else {
if(GrCoverageCountingPathRenderer::IsSupported(*caps)) {
writer.appendString(
gPathRendererNames[GpuPathRenderers::kCoverageCounting].c_str());
}
writer.appendString(gPathRendererNames[GpuPathRenderers::kSmall].c_str());
}
writer.appendString(
gPathRendererNames[GpuPathRenderers::kTessellating].c_str());
writer.appendString(gPathRendererNames[GpuPathRenderers::kNone].c_str());
}
});
// Softkey state
WriteStateObject(writer, kSoftkeyStateName, kSoftkeyHint,
[this](SkJSONWriter& writer) {
writer.appendString(kSoftkeyHint);
for (const auto& softkey : fCommands.getCommandsAsSoftkeys()) {
writer.appendString(softkey.c_str());
}
});
writer.endArray();
writer.flush();
auto data = memStream.detachAsData();
// TODO: would be cool to avoid this copy
const SkString cstring(static_cast<const char*>(data->data()), data->size());
fWindow->setUIState(cstring.c_str());
}
void Viewer::onUIStateChanged(const SkString& stateName, const SkString& stateValue) {
// For those who will add more features to handle the state change in this function:
// After the change, please call updateUIState no notify the frontend (e.g., Android app).
// For example, after slide change, updateUIState is called inside setupCurrentSlide;
// after backend change, updateUIState is called in this function.
if (stateName.equals(kSlideStateName)) {
for (int i = 0; i < fSlides.count(); ++i) {
if (fSlides[i]->getName().equals(stateValue)) {
this->setCurrentSlide(i);
return;
}
}
SkDebugf("Slide not found: %s", stateValue.c_str());
} else if (stateName.equals(kBackendStateName)) {
for (int i = 0; i < sk_app::Window::kBackendTypeCount; i++) {
if (stateValue.equals(kBackendTypeStrings[i])) {
if (fBackendType != i) {
fBackendType = (sk_app::Window::BackendType)i;
fWindow->detach();
fWindow->attach(backend_type_for_window(fBackendType));
}
break;
}
}
} else if (stateName.equals(kMSAAStateName)) {
DisplayParams params = fWindow->getRequestedDisplayParams();
int sampleCount = atoi(stateValue.c_str());
if (sampleCount != params.fMSAASampleCount) {
params.fMSAASampleCount = sampleCount;
fWindow->setRequestedDisplayParams(params);
fWindow->inval();
this->updateTitle();
this->updateUIState();
}
} else if (stateName.equals(kPathRendererStateName)) {
DisplayParams params = fWindow->getRequestedDisplayParams();
for (const auto& pair : gPathRendererNames) {
if (pair.second == stateValue.c_str()) {
if (params.fGrContextOptions.fGpuPathRenderers != pair.first) {
params.fGrContextOptions.fGpuPathRenderers = pair.first;
fWindow->setRequestedDisplayParams(params);
fWindow->inval();
this->updateTitle();
this->updateUIState();
}
break;
}
}
} else if (stateName.equals(kSoftkeyStateName)) {
if (!stateValue.equals(kSoftkeyHint)) {
fCommands.onSoftkey(stateValue);
this->updateUIState(); // This is still needed to reset the value to kSoftkeyHint
}
} else if (stateName.equals(kRefreshStateName)) {
// This state is actually NOT in the UI state.
// We use this to allow Android to quickly set bool fRefresh.
fRefresh = stateValue.equals(kON);
} else {
SkDebugf("Unknown stateName: %s", stateName.c_str());
}
}
bool Viewer::onKey(sk_app::Window::Key key, sk_app::Window::InputState state, uint32_t modifiers) {
return fCommands.onKey(key, state, modifiers);
}
bool Viewer::onChar(SkUnichar c, uint32_t modifiers) {
if (fSlides[fCurrentSlide]->onChar(c)) {
fWindow->inval();
return true;
} else {
return fCommands.onChar(c, modifiers);
}
}
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