| /* |
| * 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.h" |
| #include "SkColorMatrixFilter.h" |
| #include "SkGradientShader.h" |
| #include "SkImage.h" |
| |
| #define WIDTH 500 |
| #define HEIGHT 500 |
| |
| static void set_color_matrix(SkPaint* paint, const SkColorMatrix& matrix) { |
| paint->setColorFilter(SkColorMatrixFilter::Create(matrix))->unref(); |
| } |
| |
| static void set_array(SkPaint* paint, const SkScalar array[]) { |
| paint->setColorFilter(SkColorMatrixFilter::Create(array))->unref(); |
| } |
| |
| class ColorMatrixGM : public skiagm::GM { |
| public: |
| ColorMatrixGM() { |
| this->setBGColor(sk_tool_utils::color_to_565(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 SkImage::MakeFromBitmap(bm); |
| } |
| |
| // 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, |
| SkShader::kClamp_TileMode)); |
| canvas.drawRect(SkRect::MakeWH(SkIntToScalar(width), SkIntToScalar(height)), paint); |
| return SkImage::MakeFromBitmap(bm); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| SkPaint paint; |
| SkColorMatrix matrix; |
| |
| paint.setXfermodeMode(SkXfermode::kSrc_Mode); |
| 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, &paint); |
| |
| matrix.setRotate(SkColorMatrix::kR_Axis, 90); |
| set_color_matrix(&paint, matrix); |
| canvas->drawImage(bmps[i], 80, 0, &paint); |
| |
| matrix.setRotate(SkColorMatrix::kG_Axis, 90); |
| set_color_matrix(&paint, matrix); |
| canvas->drawImage(bmps[i], 160, 0, &paint); |
| |
| matrix.setRotate(SkColorMatrix::kB_Axis, 90); |
| set_color_matrix(&paint, matrix); |
| canvas->drawImage(bmps[i], 240, 0, &paint); |
| /////////////////////////////////////////////// |
| matrix.setSaturation(0.0f); |
| set_color_matrix(&paint, matrix); |
| canvas->drawImage(bmps[i], 0, 80, &paint); |
| |
| matrix.setSaturation(0.5f); |
| set_color_matrix(&paint, matrix); |
| canvas->drawImage(bmps[i], 80, 80, &paint); |
| |
| matrix.setSaturation(1.0f); |
| set_color_matrix(&paint, matrix); |
| canvas->drawImage(bmps[i], 160, 80, &paint); |
| |
| matrix.setSaturation(2.0f); |
| set_color_matrix(&paint, matrix); |
| canvas->drawImage(bmps[i], 240, 80, &paint); |
| /////////////////////////////////////////////// |
| matrix.setRGB2YUV(); |
| set_color_matrix(&paint, matrix); |
| canvas->drawImage(bmps[i], 0, 160, &paint); |
| |
| matrix.setYUV2RGB(); |
| set_color_matrix(&paint, matrix); |
| canvas->drawImage(bmps[i], 80, 160, &paint); |
| |
| SkScalar s1 = SK_Scalar1; |
| SkScalar s255 = SkIntToScalar(255); |
| // Move red into alpha, set color to white |
| SkScalar data[20] = { |
| 0, 0, 0, 0, s255, |
| 0, 0, 0, 0, s255, |
| 0, 0, 0, 0, s255, |
| s1, 0, 0, 0, 0, |
| }; |
| |
| set_array(&paint, data); |
| canvas->drawImage(bmps[i], 160, 160, &paint); |
| /////////////////////////////////////////////// |
| canvas->translate(0, 240); |
| } |
| } |
| |
| private: |
| sk_sp<SkImage> fSolidImg; |
| sk_sp<SkImage> fTransparentImg; |
| |
| typedef skiagm::GM INHERITED; |
| }; |
| DEF_GM( return new ColorMatrixGM; ) |
| |