46f5ee1561
Bug: skia: Change-Id: If34e08cb320a141cb838caafeffa4f1f69c5234f Reviewed-on: https://skia-review.googlesource.com/c/skia/+/201404 Commit-Queue: Nathaniel Nifong <nifong@google.com> Reviewed-by: Kevin Lubick <kjlubick@google.com>
255 lines
9.9 KiB
C++
255 lines
9.9 KiB
C++
/*
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* Copyright 2019 Google LLC
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkDebugCanvas.h"
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#include "SkJSONWriter.h"
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#include "SkPicture.h"
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#include "SkSurface.h"
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#include "UrlDataManager.h"
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#include <emscripten.h>
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#include <emscripten/bind.h>
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#if SK_SUPPORT_GPU
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#include "GrBackendSurface.h"
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#include "GrContext.h"
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#include "GrGLInterface.h"
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#include "GrGLTypes.h"
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#include <GL/gl.h>
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#include <emscripten/html5.h>
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#endif
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using JSColor = int32_t;
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struct SimpleImageInfo {
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int width;
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int height;
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SkColorType colorType;
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SkAlphaType alphaType;
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};
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SkImageInfo toSkImageInfo(const SimpleImageInfo& sii) {
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return SkImageInfo::Make(sii.width, sii.height, sii.colorType, sii.alphaType);
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}
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class SkpDebugPlayer {
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public:
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SkpDebugPlayer() {}
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/* loadSkp deserializes a skp file that has been copied into the shared WASM memory.
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* cptr - a pointer to the data to deserialize.
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* length - length of the data in bytes.
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* The caller must allocate the memory with M._malloc where M is the wasm module in javascript
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* and copy the data into M.buffer at the pointer returned by malloc.
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*
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* uintptr_t is used here because emscripten will not allow binding of functions with pointers
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* to primitive types. We can instead pass a number and cast it to whatever kind of
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* pointer we're expecting.
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*/
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void loadSkp(uintptr_t cptr, int length) {
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const auto* data = reinterpret_cast<const uint8_t*>(cptr);
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// note overloaded = operator that actually does a move
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fPicture = SkPicture::MakeFromData(data, length);
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if (!fPicture) {
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SkDebugf("Unable to parse SKP file.\n");
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return;
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}
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SkDebugf("Parsed SKP file.\n");
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// Make debug canvas using bounds from SkPicture
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fBounds = fPicture->cullRect().roundOut();
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fDebugCanvas.reset(new SkDebugCanvas(fBounds));
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SkDebugf("SkDebugCanvas created.\n");
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// Only draw picture to the debug canvas once.
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fDebugCanvas->drawPicture(fPicture);
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SkDebugf("Added picture with %d commands.\n", fDebugCanvas->getSize());
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}
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/* drawTo asks the debug canvas to draw from the beginning of the picture
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* to the given command and flush the canvas.
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*/
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void drawTo(SkSurface* surface, int32_t index) {
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fDebugCanvas->drawTo(surface->getCanvas(), index);
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surface->getCanvas()->flush();
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}
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const SkIRect& getBounds() { return fBounds; }
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void setOverdrawVis(bool on) { fDebugCanvas->setOverdrawViz(on); }
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void setGpuOpBounds(bool on) { fDebugCanvas->setDrawGpuOpBounds(on); }
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void setClipVizColor(JSColor color) {
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SkDebugf("Setting clip vis color to %d\n", color);
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fDebugCanvas->setClipVizColor(SkColor(color));
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}
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int getSize() const { return fDebugCanvas->getSize(); }
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void deleteCommand(int index) { fDebugCanvas->deleteDrawCommandAt(index); }
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void setCommandVisibility(int index, bool visible) {
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fDebugCanvas->toggleCommand(index, visible);
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}
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// Return the command list in JSON representation as a string
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std::string jsonCommandList(sk_sp<SkSurface> surface) {
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SkDynamicMemoryWStream stream;
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SkJSONWriter writer(&stream, SkJSONWriter::Mode::kFast);
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// Note that the root url provided here may need to change in the production deployment.
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// this will be prepended to any links that are created in the json command list.
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UrlDataManager udm(SkString("/"));
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writer.beginObject(); // root
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// Some vals currently hardcoded until gpu is supported
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writer.appendString("mode", "cpu");
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writer.appendBool("drawGpuOpBounds", fDebugCanvas->getDrawGpuOpBounds());
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writer.appendS32("colorMode", SkColorType::kRGBA_8888_SkColorType);
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fDebugCanvas->toJSON(writer, udm, getSize(), surface->getCanvas());
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writer.endObject(); // root
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writer.flush();
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auto skdata = stream.detachAsData();
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// Convert skdata to string_view, which accepts a length
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std::string_view data_view(reinterpret_cast<const char*>(skdata->data()), skdata->size());
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// and string_view to string, which emscripten understands.
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return std::string(data_view);
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}
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private:
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// admission of ignorance - don't know when to use unique pointer or sk_sp
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std::unique_ptr<SkDebugCanvas> fDebugCanvas;
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sk_sp<SkPicture> fPicture;
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SkIRect fBounds;
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};
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#if SK_SUPPORT_GPU
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sk_sp<GrContext> MakeGrContext(EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context)
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{
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EMSCRIPTEN_RESULT r = emscripten_webgl_make_context_current(context);
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if (r < 0) {
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SkDebugf("failed to make webgl context current %d\n", r);
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return nullptr;
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}
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// setup GrContext
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auto interface = GrGLMakeNativeInterface();
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// setup contexts
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sk_sp<GrContext> grContext(GrContext::MakeGL(interface));
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return grContext;
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}
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sk_sp<SkSurface> MakeOnScreenGLSurface(sk_sp<GrContext> grContext, int width, int height) {
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glClearColor(0, 0, 0, 0);
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glClearStencil(0);
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glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
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// Wrap the frame buffer object attached to the screen in a Skia render
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// target so Skia can render to it
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GrGLint buffer;
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glGetIntegerv(GL_FRAMEBUFFER_BINDING, &buffer);
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GrGLFramebufferInfo info;
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info.fFBOID = (GrGLuint) buffer;
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SkColorType colorType;
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info.fFormat = GL_RGBA8;
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colorType = kRGBA_8888_SkColorType;
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GrBackendRenderTarget target(width, height, 0, 8, info);
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sk_sp<SkSurface> surface(SkSurface::MakeFromBackendRenderTarget(grContext.get(), target,
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kBottomLeft_GrSurfaceOrigin,
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colorType, nullptr, nullptr));
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return surface;
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}
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sk_sp<SkSurface> MakeRenderTarget(sk_sp<GrContext> grContext, int width, int height) {
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SkImageInfo info = SkImageInfo::MakeN32(width, height, SkAlphaType::kPremul_SkAlphaType);
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sk_sp<SkSurface> surface(SkSurface::MakeRenderTarget(grContext.get(),
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SkBudgeted::kYes,
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info, 0,
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kBottomLeft_GrSurfaceOrigin,
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nullptr, true));
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return surface;
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}
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sk_sp<SkSurface> MakeRenderTarget(sk_sp<GrContext> grContext, SimpleImageInfo sii) {
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sk_sp<SkSurface> surface(SkSurface::MakeRenderTarget(grContext.get(),
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SkBudgeted::kYes,
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toSkImageInfo(sii), 0,
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kBottomLeft_GrSurfaceOrigin,
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nullptr, true));
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return surface;
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}
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#endif
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using namespace emscripten;
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EMSCRIPTEN_BINDINGS(my_module) {
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// The main class that the JavaScript in index.html uses
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class_<SkpDebugPlayer>("SkpDebugPlayer")
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.constructor<>()
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.function("loadSkp", &SkpDebugPlayer::loadSkp, allow_raw_pointers())
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.function("drawTo", &SkpDebugPlayer::drawTo, allow_raw_pointers())
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.function("getBounds", &SkpDebugPlayer::getBounds)
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.function("setOverdrawVis", &SkpDebugPlayer::setOverdrawVis)
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.function("setClipVizColor", &SkpDebugPlayer::setClipVizColor)
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.function("getSize", &SkpDebugPlayer::getSize)
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.function("deleteCommand", &SkpDebugPlayer::deleteCommand)
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.function("setCommandVisibility", &SkpDebugPlayer::setCommandVisibility)
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.function("jsonCommandList", &SkpDebugPlayer::jsonCommandList, allow_raw_pointers());
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// Structs used as arguments or returns to the functions above
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value_object<SkIRect>("SkIRect")
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.field("fLeft", &SkIRect::fLeft)
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.field("fTop", &SkIRect::fTop)
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.field("fRight", &SkIRect::fRight)
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.field("fBottom", &SkIRect::fBottom);
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// Symbols needed by cpu.js to perform surface creation and flushing.
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enum_<SkColorType>("ColorType")
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.value("RGBA_8888", SkColorType::kRGBA_8888_SkColorType);
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enum_<SkAlphaType>("AlphaType")
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.value("Unpremul", SkAlphaType::kUnpremul_SkAlphaType);
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value_object<SimpleImageInfo>("SkImageInfo")
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.field("width", &SimpleImageInfo::width)
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.field("height", &SimpleImageInfo::height)
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.field("colorType", &SimpleImageInfo::colorType)
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.field("alphaType", &SimpleImageInfo::alphaType);
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constant("TRANSPARENT", (JSColor) SK_ColorTRANSPARENT);
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function("_getRasterDirectSurface", optional_override([](const SimpleImageInfo ii,
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uintptr_t /* uint8_t* */ pPtr,
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size_t rowBytes)->sk_sp<SkSurface> {
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uint8_t* pixels = reinterpret_cast<uint8_t*>(pPtr);
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SkImageInfo imageInfo = toSkImageInfo(ii);
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return SkSurface::MakeRasterDirect(imageInfo, pixels, rowBytes, nullptr);
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}), allow_raw_pointers());
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class_<SkSurface>("SkSurface")
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.smart_ptr<sk_sp<SkSurface>>("sk_sp<SkSurface>")
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.function("width", &SkSurface::width)
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.function("height", &SkSurface::height)
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.function("_flush", select_overload<void()>(&SkSurface::flush))
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.function("getCanvas", &SkSurface::getCanvas, allow_raw_pointers());
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class_<SkCanvas>("SkCanvas")
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.function("clear", optional_override([](SkCanvas& self, JSColor color)->void {
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// JS side gives us a signed int instead of an unsigned int for color
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// Add a optional_override to change it out.
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self.clear(SkColor(color));
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}));
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#if SK_SUPPORT_GPU
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class_<GrContext>("GrContext")
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.smart_ptr<sk_sp<GrContext>>("sk_sp<GrContext>");
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function("currentContext", &emscripten_webgl_get_current_context);
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function("setCurrentContext", &emscripten_webgl_make_context_current);
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function("MakeGrContext", &MakeGrContext);
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function("MakeOnScreenGLSurface", &MakeOnScreenGLSurface);
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function("MakeRenderTarget", select_overload<sk_sp<SkSurface>(
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sk_sp<GrContext>, int, int)>(&MakeRenderTarget));
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function("MakeRenderTarget", select_overload<sk_sp<SkSurface>(
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sk_sp<GrContext>, SimpleImageInfo)>(&MakeRenderTarget));
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constant("gpu", true);
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#endif
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}
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