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