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skia2/gm/composeshader.cpp
Herb Derby c37b386886 Replace SK_ARRAY_COUNT with std::size() for skia/gm 
Note: in variedtext.cpp:66 changed static_assert to SkASSERT.

Change-Id: I853a2e5563c90c9dde5d6ba5443cc73b664b493d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/551876
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
2022-06-21 18:09:30 +00:00

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/*
* Copyright 2012 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/SkBitmap.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorPriv.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/SkTileMode.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkGradientShader.h"
#include "include/private/SkTDArray.h"
#include "src/core/SkTLazy.h"
#include "tools/ToolUtils.h"
#include <utility>
static sk_sp<SkShader> make_shader(SkBlendMode mode) {
SkPoint pts[2];
SkColor colors[2];
pts[0].set(0, 0);
pts[1].set(SkIntToScalar(100), 0);
colors[0] = SK_ColorRED;
colors[1] = SK_ColorBLUE;
auto shaderA = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kClamp);
pts[0].set(0, 0);
pts[1].set(0, SkIntToScalar(100));
colors[0] = SK_ColorBLACK;
colors[1] = SkColorSetARGB(0x80, 0, 0, 0);
auto shaderB = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kClamp);
return SkShaders::Blend(mode, std::move(shaderA), std::move(shaderB));
}
class ComposeShaderGM : public skiagm::GM {
protected:
void onOnceBeforeDraw() override {
fShader = make_shader(SkBlendMode::kDstIn);
}
SkString onShortName() override {
return SkString("composeshader");
}
SkISize onISize() override {
return SkISize::Make(120, 120);
}
void onDraw(SkCanvas* canvas) override {
SkPaint paint;
paint.setColor(SK_ColorGREEN);
canvas->drawRect(SkRect::MakeWH(100, 100), paint);
paint.setShader(fShader);
canvas->drawRect(SkRect::MakeWH(100, 100), paint);
}
protected:
sk_sp<SkShader> fShader;
private:
typedef GM INHERITED ;
};
DEF_GM( return new ComposeShaderGM; )
class ComposeShaderAlphaGM : public skiagm::GM {
public:
ComposeShaderAlphaGM() {}
protected:
SkString onShortName() override {
return SkString("composeshader_alpha");
}
SkISize onISize() override {
return SkISize::Make(750, 220);
}
void onDraw(SkCanvas* canvas) override {
sk_sp<SkShader> shaders[] = {
make_shader(SkBlendMode::kDstIn),
make_shader(SkBlendMode::kSrcOver),
};
SkPaint paint;
paint.setColor(SK_ColorGREEN);
const SkRect r = SkRect::MakeXYWH(5, 5, 100, 100);
for (size_t y = 0; y < std::size(shaders); ++y) {
canvas->save();
for (int alpha = 0xFF; alpha > 0; alpha -= 0x28) {
paint.setAlphaf(1.0f);
paint.setShader(nullptr);
canvas->drawRect(r, paint);
paint.setAlpha(alpha);
paint.setShader(shaders[y]);
canvas->drawRect(r, paint);
canvas->translate(r.width() + 5, 0);
}
canvas->restore();
canvas->translate(0, r.height() + 5);
}
}
private:
typedef GM INHERITED ;
};
DEF_GM( return new ComposeShaderAlphaGM; )
// creates a square bitmap with red background and a green circle in the center
static void draw_color_bm(SkBitmap* bm, int length) {
SkPaint paint;
paint.setColor(SK_ColorGREEN);
bm->allocN32Pixels(length, length);
bm->eraseColor(SK_ColorRED);
SkCanvas canvas(*bm);
canvas.drawCircle(SkIntToScalar(length/2), SkIntToScalar(length/2), SkIntToScalar(length/2),
paint);
}
// creates a square alpha8 bitmap with transparent background and an opaque circle in the center
static void draw_alpha8_bm(SkBitmap* bm, int length) {
SkPaint circlePaint;
circlePaint.setColor(SK_ColorBLACK);
bm->allocPixels(SkImageInfo::MakeA8(length, length));
bm->eraseColor(SK_ColorTRANSPARENT);
SkCanvas canvas(*bm);
canvas.drawCircle(SkIntToScalar(length/2), SkIntToScalar(length/2), SkIntToScalar(length/4),
circlePaint);
}
// creates a linear gradient shader
static sk_sp<SkShader> make_linear_gradient_shader(int length) {
SkPoint pts[2];
SkColor colors[2];
pts[0].set(0, 0);
pts[1].set(SkIntToScalar(length), 0);
colors[0] = SK_ColorBLUE;
colors[1] = SkColorSetARGB(0, 0, 0, 0xFF);
return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kClamp);
}
class ComposeShaderBitmapGM : public skiagm::GM {
public:
ComposeShaderBitmapGM(bool use_lm) : fUseLocalMatrix(use_lm) {}
protected:
SkString onShortName() override {
return SkStringPrintf("composeshader_bitmap%s", fUseLocalMatrix ? "_lm" : "");
}
SkISize onISize() override {
return SkISize::Make(7 * (squareLength + 5), 2 * (squareLength + 5));
}
void onDraw(SkCanvas* canvas) override {
if (!fInitialized) {
draw_color_bm(&fColorBitmap, squareLength);
sk_sp<SkImage> img = SkImage::MakeFromBitmap(fColorBitmap);
img = ToolUtils::MakeTextureImage(canvas, std::move(img));
fColorBitmapShader = img->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat,
SkSamplingOptions(), SkMatrix::I());
draw_alpha8_bm(&fAlpha8Bitmap, squareLength);
img = SkImage::MakeFromBitmap(fAlpha8Bitmap);
img = ToolUtils::MakeTextureImage(canvas, std::move(img));
fAlpha8BitmapShader = fAlpha8Bitmap.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat,
SkSamplingOptions(), SkMatrix::I());
fLinearGradientShader = make_linear_gradient_shader(squareLength);
fInitialized = true;
}
SkBlendMode mode = SkBlendMode::kDstOver;
SkMatrix lm = SkMatrix::Translate(0, squareLength * 0.5f);
sk_sp<SkShader> shaders[] = {
// gradient should appear over color bitmap
SkShaders::Blend(mode, fLinearGradientShader, fColorBitmapShader),
// gradient should appear over alpha8 bitmap colorized by the paint color
SkShaders::Blend(mode, fLinearGradientShader, fAlpha8BitmapShader),
};
if (fUseLocalMatrix) {
for (unsigned i = 0; i < std::size(shaders); ++i) {
shaders[i] = shaders[i]->makeWithLocalMatrix(lm);
}
}
SkPaint paint;
paint.setColor(SK_ColorYELLOW);
const SkRect r = SkRect::MakeIWH(squareLength, squareLength);
for (size_t y = 0; y < std::size(shaders); ++y) {
canvas->save();
for (int alpha = 0xFF; alpha > 0; alpha -= 0x28) {
paint.setAlpha(alpha);
paint.setShader(shaders[y]);
canvas->drawRect(r, paint);
canvas->translate(r.width() + 5, 0);
}
canvas->restore();
canvas->translate(0, r.height() + 5);
}
}
private:
/** This determines the length and width of the bitmaps used in the ComposeShaders. Values
* above 20 may cause an SkASSERT to fail in SkSmallAllocator. However, larger values will
* work in a release build. You can change this parameter and then compile a release build
* to have this GM draw larger bitmaps for easier visual inspection.
*/
inline static constexpr int squareLength = 20;
const bool fUseLocalMatrix;
bool fInitialized = false;
SkBitmap fColorBitmap;
SkBitmap fAlpha8Bitmap;
sk_sp<SkShader> fColorBitmapShader;
sk_sp<SkShader> fAlpha8BitmapShader;
sk_sp<SkShader> fLinearGradientShader;
using INHERITED = GM;
};
DEF_GM( return new ComposeShaderBitmapGM(false); )
DEF_GM( return new ComposeShaderBitmapGM(true); )
DEF_SIMPLE_GM(composeshader_bitmap2, canvas, 200, 200) {
int width = 255;
int height = 255;
SkTDArray<uint8_t> dst8Storage;
dst8Storage.setCount(width * height);
SkTDArray<uint32_t> dst32Storage;
dst32Storage.setCount(width * height * sizeof(int32_t));
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
dst8Storage[y * width + x] = (y + x) / 2;
dst32Storage[y * width + x] = SkPackARGB32(0xFF, x, y, 0);
}
}
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(SK_ColorBLUE);
SkRect r = {0, 0, SkIntToScalar(width), SkIntToScalar(height)};
canvas->drawRect(r, paint);
SkBitmap skBitmap, skMask;
SkImageInfo imageInfo = SkImageInfo::Make(width, height,
SkColorType::kN32_SkColorType, kPremul_SkAlphaType);
skBitmap.installPixels(imageInfo, dst32Storage.begin(), width * sizeof(int32_t),
nullptr, nullptr);
imageInfo = SkImageInfo::Make(width, height,
SkColorType::kAlpha_8_SkColorType, kPremul_SkAlphaType);
skMask.installPixels(imageInfo, dst8Storage.begin(), width, nullptr, nullptr);
sk_sp<SkImage> skSrc = skBitmap.asImage();
sk_sp<SkImage> skMaskImage = skMask.asImage();
paint.setShader(
SkShaders::Blend(SkBlendMode::kSrcIn,
skMaskImage->makeShader(SkSamplingOptions()),
skSrc->makeShader(SkSamplingOptions())));
canvas->drawRect(r, paint);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
static sk_sp<SkShader> make_src_shader(SkScalar size) {
const SkPoint pts[] = { { 0, 0 }, { 0, size } };
const SkColor colors[] = { 0xFF0000FF, 0x000000FF };
return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kClamp);
}
static sk_sp<SkShader> make_dst_shader(SkScalar size) {
const SkPoint pts[] = { { 0, 0 }, { size, 0 } };
const SkColor colors[] = { SK_ColorRED, 0x00FF0000 };
return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kClamp);
}
const SkScalar gCellSize = 100;
static void draw_cell(SkCanvas* canvas, sk_sp<SkShader> src, sk_sp<SkShader> dst,
SkBlendMode mode, SkAlpha alpha) {
const SkRect r = SkRect::MakeWH(gCellSize, gCellSize);
SkPaint p;
p.setAlpha(alpha);
SkAutoCanvasRestore acr(canvas, false);
canvas->saveLayer(&r, &p);
p.setAlpha(0xFF);
p.setShader(dst);
p.setBlendMode(SkBlendMode::kSrc);
canvas->drawRect(r, p);
p.setShader(src);
p.setBlendMode(mode);
canvas->drawRect(r, p);
}
static void draw_composed(SkCanvas* canvas, sk_sp<SkShader> src, sk_sp<SkShader> dst,
SkBlendMode mode, SkAlpha alpha) {
SkPaint p;
p.setAlpha(alpha);
p.setShader(SkShaders::Blend(mode, dst, src));
canvas->drawRect(SkRect::MakeWH(gCellSize, gCellSize), p);
}
static void draw_pair(SkCanvas* canvas, sk_sp<SkShader> src, sk_sp<SkShader> dst,
SkBlendMode mode) {
SkAutoCanvasRestore acr(canvas, true);
const SkScalar gap = 4;
SkRect r = SkRect::MakeWH(2 * gCellSize + gap, 2 * gCellSize + gap);
r.outset(gap + 1.5f, gap + 1.5f);
SkPaint p;
p.setStyle(SkPaint::kStroke_Style);
canvas->drawRect(r, p); // border
SkAlpha alpha = 0xFF;
for (int y = 0; y < 2; ++y) {
draw_cell(canvas, src, dst, mode, alpha);
canvas->save();
canvas->translate(gCellSize + gap, 0);
draw_composed(canvas, src, dst, mode, alpha);
canvas->restore();
canvas->translate(0, gCellSize + gap);
alpha = 0x80;
}
}
DEF_SIMPLE_GM(composeshader_grid, canvas, 882, 882) {
auto src = make_src_shader(gCellSize);
auto dst = make_dst_shader(gCellSize);
const SkScalar margin = 15;
const SkScalar dx = 2*gCellSize + margin;
const SkScalar dy = 2*gCellSize + margin;
canvas->translate(margin, margin);
canvas->save();
for (int m = 0; m < 16; ++m) {
SkBlendMode mode = static_cast<SkBlendMode>(m);
draw_pair(canvas, src, dst, mode);
if ((m % 4) == 3) {
canvas->restore();
canvas->translate(0, dy);
canvas->save();
} else {
canvas->translate(dx, 0);
}
}
canvas->restore();
}
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