145 lines
4.6 KiB
C++
145 lines
4.6 KiB
C++
/*
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* Copyright 2011 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/SkColorFilter.h"
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#include "include/core/SkImage.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/SkColorMatrix.h"
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#include "include/effects/SkGradientShader.h"
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#define WIDTH 500
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#define HEIGHT 160
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static void set_color_matrix(SkPaint* paint, const SkColorMatrix& matrix) {
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paint->setColorFilter(SkColorFilters::Matrix(matrix));
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}
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static void set_array(SkPaint* paint, const float array[]) {
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paint->setColorFilter(SkColorFilters::Matrix(array));
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}
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class ColorMatrixGM : public skiagm::GM {
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public:
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ColorMatrixGM() {
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this->setBGColor(0xFF808080);
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}
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protected:
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SkString onShortName() override {
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return SkString("colormatrix");
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}
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SkISize onISize() override {
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return SkISize::Make(WIDTH, HEIGHT);
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}
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void onOnceBeforeDraw() override {
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fSolidImg = CreateSolidBitmap(64, 64);
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fTransparentImg = CreateTransparentBitmap(64, 64);
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}
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static sk_sp<SkImage> CreateSolidBitmap(int width, int height) {
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SkBitmap bm;
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bm.allocN32Pixels(width, height);
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SkCanvas canvas(bm);
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canvas.clear(0x0);
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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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SkPaint paint;
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paint.setColor(SkColorSetARGB(255, x * 255 / width, y * 255 / height, 0));
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canvas.drawRect(SkRect::MakeXYWH(SkIntToScalar(x),
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SkIntToScalar(y), SK_Scalar1, SK_Scalar1), paint);
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}
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}
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return bm.asImage();
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}
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// creates a bitmap with shades of transparent gray.
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static sk_sp<SkImage> CreateTransparentBitmap(int width, int height) {
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SkBitmap bm;
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bm.allocN32Pixels(width, height);
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SkCanvas canvas(bm);
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canvas.clear(0x0);
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SkPoint pts[] = {{0, 0}, {SkIntToScalar(width), SkIntToScalar(height)}};
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SkColor colors[] = {0x00000000, 0xFFFFFFFF};
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SkPaint paint;
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paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2,
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SkTileMode::kClamp));
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canvas.drawRect(SkRect::MakeWH(SkIntToScalar(width), SkIntToScalar(height)), paint);
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return bm.asImage();
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}
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void onDraw(SkCanvas* canvas) override {
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SkPaint paint;
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SkColorMatrix matrix;
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paint.setBlendMode(SkBlendMode::kSrc);
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const SkImage* bmps[] = { fSolidImg.get(), fTransparentImg.get() };
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for (size_t i = 0; i < SK_ARRAY_COUNT(bmps); ++i) {
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matrix.setIdentity();
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set_color_matrix(&paint, matrix);
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canvas->drawImage(bmps[i], 0, 0, SkSamplingOptions(), &paint);
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///////////////////////////////////////////////
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matrix.setSaturation(0.0f);
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set_color_matrix(&paint, matrix);
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canvas->drawImage(bmps[i], 80, 0, SkSamplingOptions(), &paint);
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matrix.setSaturation(0.5f);
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set_color_matrix(&paint, matrix);
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canvas->drawImage(bmps[i], 160, 0, SkSamplingOptions(), &paint);
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matrix.setSaturation(1.0f);
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set_color_matrix(&paint, matrix);
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canvas->drawImage(bmps[i], 240, 0, SkSamplingOptions(), &paint);
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matrix.setSaturation(2.0f);
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set_color_matrix(&paint, matrix);
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canvas->drawImage(bmps[i], 320, 0, SkSamplingOptions(), &paint);
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///////////////////////////////////////////////
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// Move red into alpha, set color to white
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float data[20] = {
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0, 0, 0, 0, 1,
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0, 0, 0, 0, 1,
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0, 0, 0, 0, 1,
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1, 0, 0, 0, 0,
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};
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set_array(&paint, data);
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canvas->drawImage(bmps[i], 400, 0, SkSamplingOptions(), &paint);
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///////////////////////////////////////////////
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canvas->translate(0, 80);
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}
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}
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private:
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sk_sp<SkImage> fSolidImg;
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sk_sp<SkImage> fTransparentImg;
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using INHERITED = skiagm::GM;
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};
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DEF_GM( return new ColorMatrixGM; )
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