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842f29674d
skia2/gm/drawimageset.cpp
Brian Salomon 9fa47cc1c6 Make class members that are static constexpr also be inline. 
This is in prep for compiling with -std=c++14 and -Wno-c++17-extensions
when building with clang. Chrome has encountered problems with
third_party headers that are included both in Skia and other Chrome
sources that produce different code based on whether preprocessor macros
indicate a C++14 or C++17 compilation.

In C++17 they are already inline implicitly. When compiling with C++14
we can get linker errors unless they're explicitly inlined or defined
outside the class. With -Wno-c++17-extensions we can explicitly inline
them in the C++14 build because the warning that would be generated
about using a C++17 language extension is suppressed.

We cannot do this in public headers because we support compiling with
C++14 without suppressing the C++17 language extension warnings.

Bug: chromium:1257145
Change-Id: Iaf5f4c62a398f98dd4ca9b7dfb86f2d5cab21d66
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/457498
Reviewed-by: Ben Wagner <bungeman@google.com>
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2021-10-11 16:22:59 +00:00

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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm/gm.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorFilter.h"
#include "include/core/SkImage.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkShader.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkSurface.h"
#include "include/core/SkTileMode.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkGradientShader.h"
#include "tools/ToolUtils.h"
#include <algorithm>
#include <initializer_list>
#include <utility>
// Makes a set of m x n tiled images to be drawn with SkCanvas::experimental_drawImageSetV1().
static void make_image_tiles(int tileW, int tileH, int m, int n, const SkColor colors[4],
SkCanvas::ImageSetEntry set[], const SkColor bgColor=SK_ColorLTGRAY) {
const int w = tileW * m;
const int h = tileH * n;
auto surf = SkSurface::MakeRaster(
SkImageInfo::Make(w, h, kRGBA_8888_SkColorType, kPremul_SkAlphaType));
surf->getCanvas()->clear(bgColor);
static constexpr SkScalar kStripeW = 10;
static constexpr SkScalar kStripeSpacing = 30;
SkPaint paint;
SkPoint pts1[] = {{0.f, 0.f}, {(SkScalar)w, (SkScalar)h}};
auto grad = SkGradientShader::MakeLinear(pts1, colors, nullptr, 2, SkTileMode::kClamp);
paint.setShader(std::move(grad));
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(kStripeW);
SkPoint stripePts[] = {{-w - kStripeW, -kStripeW}, {kStripeW, h + kStripeW}};
while (stripePts[0].fX <= w) {
surf->getCanvas()->drawPoints(SkCanvas::kLines_PointMode, 2, stripePts, paint);
stripePts[0].fX += kStripeSpacing;
stripePts[1].fX += kStripeSpacing;
}
SkPoint pts2[] = {{0.f, (SkScalar)h}, {(SkScalar)w, 0.f}};
grad = SkGradientShader::MakeLinear(pts2, colors + 2, nullptr, 2, SkTileMode::kClamp);
paint.setShader(std::move(grad));
paint.setBlendMode(SkBlendMode::kMultiply);
stripePts[0] = {-w - kStripeW, h + kStripeW};
stripePts[1] = {kStripeW, -kStripeW};
while (stripePts[0].fX <= w) {
surf->getCanvas()->drawPoints(SkCanvas::kLines_PointMode, 2, stripePts, paint);
stripePts[0].fX += kStripeSpacing;
stripePts[1].fX += kStripeSpacing;
}
auto fullImage = surf->makeImageSnapshot();
for (int y = 0; y < n; ++y) {
for (int x = 0; x < m; ++x) {
// Images will have 1 pixel of overlap at interior seams for filtering continuity.
SkIRect subset = SkIRect::MakeXYWH(x * tileW - 1, y * tileH - 1, tileW + 2, tileH + 2);
set[y * m + x].fAAFlags = SkCanvas::kNone_QuadAAFlags;
if (x == 0) {
subset.fLeft = 0;
set[y * m + x].fAAFlags |= SkCanvas::kLeft_QuadAAFlag;
}
if (x == m - 1) {
subset.fRight = w;
set[y * m + x].fAAFlags |= SkCanvas::kRight_QuadAAFlag;
}
if (y == 0) {
subset.fTop = 0;
set[y * m + x].fAAFlags |= SkCanvas::kTop_QuadAAFlag;
}
if (y == n - 1) {
subset.fBottom = h;
set[y * m + x].fAAFlags |= SkCanvas::kBottom_QuadAAFlag;
}
set[y * m + x].fImage = fullImage->makeSubset(subset);
set[y * m + x].fSrcRect =
SkRect::MakeXYWH(x == 0 ? 0 : 1, y == 0 ? 0 : 1, tileW, tileH);
set[y * m + x].fDstRect = SkRect::MakeXYWH(x * tileW, y * tileH, tileW, tileH);
set[y * m + x].fAlpha = 1.f;
SkASSERT(set[y * m + x].fImage);
}
}
}
namespace skiagm {
class DrawImageSetGM : public GM {
private:
SkString onShortName() override { return SkString("draw_image_set"); }
SkISize onISize() override { return {1000, 725}; }
void onOnceBeforeDraw() override {
static constexpr SkColor kColors[] = {SK_ColorCYAN, SK_ColorBLACK,
SK_ColorMAGENTA, SK_ColorBLACK};
make_image_tiles(kTileW, kTileH, kM, kN, kColors, fSet);
}
void onDraw(SkCanvas* canvas) override {
SkScalar d = SkVector{kM * kTileW, kN * kTileH}.length();
SkMatrix matrices[4];
// rotation
matrices[0].setRotate(30);
matrices[0].postTranslate(d / 3, 0);
// perespective
SkPoint src[4];
SkRect::MakeWH(kM * kTileW, kN * kTileH).toQuad(src);
SkPoint dst[4] = {{0, 0},
{kM * kTileW + 10.f, -5.f},
{kM * kTileW - 28.f, kN * kTileH + 40.f},
{45.f, kN * kTileH - 25.f}};
SkAssertResult(matrices[1].setPolyToPoly(src, dst, 4));
matrices[1].postTranslate(d, 50.f);
// skew
matrices[2].setRotate(-60.f);
matrices[2].postSkew(0.5f, -1.15f);
matrices[2].postScale(0.6f, 1.05f);
matrices[2].postTranslate(d, 2.6f * d);
// perspective + mirror in x.
dst[1] = {-.25 * kM * kTileW, 0};
dst[0] = {5.f / 4.f * kM * kTileW, 0};
dst[3] = {2.f / 3.f * kM * kTileW, 1 / 2.f * kN * kTileH};
dst[2] = {1.f / 3.f * kM * kTileW, 1 / 2.f * kN * kTileH - 0.1f * kTileH};
SkAssertResult(matrices[3].setPolyToPoly(src, dst, 4));
matrices[3].postTranslate(100.f, d);
for (auto fm : {SkFilterMode::kNearest, SkFilterMode::kLinear}) {
SkPaint setPaint;
setPaint.setBlendMode(SkBlendMode::kSrcOver);
SkSamplingOptions sampling(fm);
for (size_t m = 0; m < SK_ARRAY_COUNT(matrices); ++m) {
// Draw grid of red lines at interior tile boundaries.
static constexpr SkScalar kLineOutset = 10.f;
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(SK_ColorRED);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(0.f);
for (int x = 1; x < kM; ++x) {
SkPoint pts[] = {{x * kTileW, 0}, {x * kTileW, kN * kTileH}};
matrices[m].mapPoints(pts, 2);
SkVector v = pts[1] - pts[0];
v.setLength(v.length() + kLineOutset);
canvas->drawLine(pts[1] - v, pts[0] + v, paint);
}
for (int y = 1; y < kN; ++y) {
SkPoint pts[] = {{0, y * kTileH}, {kTileW * kM, y * kTileH}};
matrices[m].mapPoints(pts, 2);
SkVector v = pts[1] - pts[0];
v.setLength(v.length() + kLineOutset);
canvas->drawLine(pts[1] - v, pts[0] + v, paint);
}
canvas->save();
canvas->concat(matrices[m]);
canvas->experimental_DrawEdgeAAImageSet(fSet, kM * kN, nullptr, nullptr, sampling,
&setPaint,
SkCanvas::kFast_SrcRectConstraint);
canvas->restore();
}
// A more exotic case with an unusual blend mode, mixed aa flags set, and alpha,
// subsets the image. And another with all the above plus a color filter.
SkCanvas::ImageSetEntry entry;
entry.fSrcRect = SkRect::MakeWH(kTileW, kTileH).makeInset(kTileW / 4.f, kTileH / 4.f);
entry.fDstRect = SkRect::MakeWH(1.5 * kTileW, 1.5 * kTileH).makeOffset(d / 4, 2 * d);
entry.fImage = fSet[0].fImage;
entry.fAlpha = 0.7f;
entry.fAAFlags = SkCanvas::kLeft_QuadAAFlag | SkCanvas::kTop_QuadAAFlag;
canvas->save();
canvas->rotate(3.f);
setPaint.setBlendMode(SkBlendMode::kExclusion);
canvas->experimental_DrawEdgeAAImageSet(&entry, 1, nullptr, nullptr, sampling,
&setPaint, SkCanvas::kFast_SrcRectConstraint);
canvas->translate(entry.fDstRect.width() + 8.f, 0);
SkPaint cfPaint = setPaint;
cfPaint.setColorFilter(SkColorFilters::LinearToSRGBGamma());
canvas->experimental_DrawEdgeAAImageSet(&entry, 1, nullptr, nullptr, sampling,
&cfPaint, SkCanvas::kFast_SrcRectConstraint);
canvas->restore();
canvas->translate(2 * d, 0);
}
}
inline static constexpr int kM = 4;
inline static constexpr int kN = 3;
inline static constexpr SkScalar kTileW = 30;
inline static constexpr SkScalar kTileH = 60;
SkCanvas::ImageSetEntry fSet[kM * kN];
};
// This GM exercises rect-stays-rect type matrices to test that filtering and antialiasing are not
// incorrectly disabled.
class DrawImageSetRectToRectGM : public GM {
private:
SkString onShortName() override { return SkString("draw_image_set_rect_to_rect"); }
SkISize onISize() override { return {1250, 850}; }
void onOnceBeforeDraw() override {
static constexpr SkColor kColors[] = {SK_ColorBLUE, SK_ColorWHITE,
SK_ColorRED, SK_ColorWHITE};
make_image_tiles(kTileW, kTileH, kM, kN, kColors, fSet);
}
void onDraw(SkCanvas* canvas) override {
ToolUtils::draw_checkerboard(canvas, SK_ColorBLACK, SK_ColorWHITE, 50);
static constexpr SkScalar kW = kM * kTileW;
static constexpr SkScalar kH = kN * kTileH;
SkMatrix matrices[5];
// Identity
matrices[0].reset();
// 90 degree rotation
matrices[1].setRotate(90, kW / 2.f, kH / 2.f);
// Scaling
matrices[2].setScale(2.f, 0.5f);
// Mirror in x and y
matrices[3].setScale(-1.f, -1.f);
matrices[3].postTranslate(kW, kH);
// Mirror in y, rotate, and scale.
matrices[4].setScale(1.f, -1.f);
matrices[4].postTranslate(0, kH);
matrices[4].postRotate(90, kW / 2.f, kH / 2.f);
matrices[4].postScale(2.f, 0.5f);
SkPaint paint;
paint.setBlendMode(SkBlendMode::kSrcOver);
static constexpr SkScalar kTranslate = std::max(kW, kH) * 2.f + 10.f;
canvas->translate(5.f, 5.f);
canvas->save();
for (SkScalar frac : {0.f, 0.5f}) {
canvas->save();
canvas->translate(frac, frac);
for (size_t m = 0; m < SK_ARRAY_COUNT(matrices); ++m) {
canvas->save();
canvas->concat(matrices[m]);
canvas->experimental_DrawEdgeAAImageSet(fSet, kM * kN, nullptr, nullptr,
SkSamplingOptions(SkFilterMode::kLinear),
&paint, SkCanvas::kFast_SrcRectConstraint);
canvas->restore();
canvas->translate(kTranslate, 0);
}
canvas->restore();
canvas->restore();
canvas->translate(0, kTranslate);
canvas->save();
}
for (SkVector scale : {SkVector{2.f, 0.5f}, SkVector{0.5, 2.f}}) {
SkCanvas::ImageSetEntry scaledSet[kM * kN];
std::copy_n(fSet, kM * kN, scaledSet);
for (int i = 0; i < kM * kN; ++i) {
scaledSet[i].fDstRect.fLeft *= scale.fX;
scaledSet[i].fDstRect.fTop *= scale.fY;
scaledSet[i].fDstRect.fRight *= scale.fX;
scaledSet[i].fDstRect.fBottom *= scale.fY;
scaledSet[i].fAlpha = 0 == (i % 3) ? 0.4f : 1.f;
}
for (size_t m = 0; m < SK_ARRAY_COUNT(matrices); ++m) {
canvas->save();
canvas->concat(matrices[m]);
canvas->experimental_DrawEdgeAAImageSet(scaledSet, kM * kN, nullptr, nullptr,
SkSamplingOptions(SkFilterMode::kLinear),
&paint, SkCanvas::kFast_SrcRectConstraint);
canvas->restore();
canvas->translate(kTranslate, 0);
}
canvas->restore();
canvas->translate(0, kTranslate);
canvas->save();
}
}
inline static constexpr int kM = 2;
inline static constexpr int kN = 2;
inline static constexpr int kTileW = 40;
inline static constexpr int kTileH = 50;
SkCanvas::ImageSetEntry fSet[kM * kN];
};
// This GM exercises alpha-only and color textures being combined correctly with the paint's color.
class DrawImageSetAlphaOnlyGM : public GM {
private:
SkString onShortName() override { return SkString("draw_image_set_alpha_only"); }
SkISize onISize() override { return {kM*kTileW, 2*kN*kTileH}; }
DrawResult onGpuSetup(GrDirectContext* direct, SkString*) override {
static constexpr SkColor kColors[] = {SK_ColorBLUE, SK_ColorTRANSPARENT,
SK_ColorRED, SK_ColorTRANSPARENT};
static constexpr SkColor kBGColor = SkColorSetARGB(128, 128, 128, 128);
make_image_tiles(kTileW, kTileH, kM, kN, kColors, fSet, kBGColor);
// Modify the alpha of the entries, decreasing by column, and convert even rows to
// alpha-only textures.
sk_sp<SkColorSpace> alphaSpace = SkColorSpace::MakeSRGB();
for (int y = 0; y < kN; ++y) {
for (int x = 0; x < kM; ++x) {
int i = y * kM + x;
fSet[i].fAlpha = (kM - x) / (float) kM;
if (y % 2 == 0) {
fSet[i].fImage = fSet[i].fImage->makeColorTypeAndColorSpace(
kAlpha_8_SkColorType, alphaSpace, direct);
}
}
}
return skiagm::DrawResult::kOk;
}
void onDraw(SkCanvas* canvas) override {
ToolUtils::draw_checkerboard(canvas, SK_ColorGRAY, SK_ColorDKGRAY, 25);
SkPaint paint;
paint.setBlendMode(SkBlendMode::kSrcOver);
paint.setColor4f({0.2f, 0.8f, 0.4f, 1.f}); // colorizes even rows, no effect on odd rows
// Top rows use experimental edge set API
canvas->experimental_DrawEdgeAAImageSet(fSet, kM * kN, nullptr, nullptr,
SkSamplingOptions(SkFilterMode::kLinear), &paint,
SkCanvas::kFast_SrcRectConstraint);
canvas->translate(0.f, kN * kTileH);
// Bottom rows draw each image from the set using the regular API
for (int y = 0; y < kN; ++y) {
for (int x = 0; x < kM; ++x) {
int i = y * kM + x;
SkPaint entryPaint = paint;
entryPaint.setAlphaf(fSet[i].fAlpha * paint.getAlphaf());
canvas->drawImageRect(fSet[i].fImage.get(), fSet[i].fSrcRect, fSet[i].fDstRect,
SkSamplingOptions(), &entryPaint,
SkCanvas::kFast_SrcRectConstraint);
}
}
}
inline static constexpr int kM = 4;
inline static constexpr int kN = 4;
inline static constexpr int kTileW = 50;
inline static constexpr int kTileH = 50;
SkCanvas::ImageSetEntry fSet[kM * kN];
};
DEF_GM(return new DrawImageSetGM();)
DEF_GM(return new DrawImageSetRectToRectGM();)
DEF_GM(return new DrawImageSetAlphaOnlyGM();)
} // namespace skiagm
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