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