| /* |
| * 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/SkCanvas.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkFont.h" |
| #include "include/core/SkFontStyle.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/SkTypeface.h" |
| #include "include/core/SkTypes.h" |
| #include "include/effects/SkGradientShader.h" |
| |
| static sk_sp<SkShader> make_heatGradient(const SkPoint pts[2]) { |
| const SkColor bw[] = { SK_ColorBLACK, SK_ColorWHITE }; |
| |
| return SkGradientShader::MakeLinear(pts, bw, nullptr, std::size(bw), SkTileMode::kClamp); |
| } |
| |
| /** |
| Test a set of clipping problems discovered while writing blitAntiRect, |
| and test all the code paths through the clipping blitters. |
| Each region should show as a blue center surrounded by a 2px green |
| border, with no red. |
| */ |
| |
| #define HEIGHT 480 |
| |
| class GammaTextGM : public skiagm::GM { |
| protected: |
| SkString onShortName() override { |
| return SkString("gammatext"); |
| } |
| |
| SkISize onISize() override { |
| return SkISize::Make(1024, HEIGHT); |
| } |
| |
| static void drawGrad(SkCanvas* canvas) { |
| const SkPoint pts[] = { { 0, 0 }, { 0, SkIntToScalar(HEIGHT) } }; |
| |
| canvas->clear(SK_ColorRED); |
| SkPaint paint; |
| paint.setShader(make_heatGradient(pts)); |
| SkRect r = { 0, 0, SkIntToScalar(1024), SkIntToScalar(HEIGHT) }; |
| canvas->drawRect(r, paint); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| drawGrad(canvas); |
| |
| const SkColor fg[] = { |
| 0xFFFFFFFF, |
| 0xFFFFFF00, 0xFFFF00FF, 0xFF00FFFF, |
| 0xFFFF0000, 0xFF00FF00, 0xFF0000FF, |
| 0xFF000000, |
| }; |
| |
| const char* text = "Hamburgefons"; |
| |
| SkPaint paint; |
| SkFont font(nullptr, 16); |
| font.setEdging(SkFont::Edging::kSubpixelAntiAlias); |
| |
| SkScalar x = SkIntToScalar(10); |
| for (size_t i = 0; i < std::size(fg); ++i) { |
| paint.setColor(fg[i]); |
| |
| SkScalar y = SkIntToScalar(40); |
| SkScalar stopy = SkIntToScalar(HEIGHT); |
| while (y < stopy) { |
| canvas->drawString(text, x, y, font, paint); |
| y += font.getSize() * 2; |
| } |
| x += SkIntToScalar(1024) / std::size(fg); |
| } |
| } |
| |
| private: |
| using INHERITED = skiagm::GM; |
| }; |
| |
| DEF_GM( return new GammaTextGM; ) |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| static sk_sp<SkShader> make_gradient(SkColor c) { |
| const SkPoint pts[] = { { 0, 0 }, { 240, 0 } }; |
| SkColor colors[2]; |
| colors[0] = c; |
| colors[1] = SkColorSetA(c, 0); |
| return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kClamp); |
| } |
| |
| static void draw_pair(SkCanvas* canvas, const SkFont& font, SkColor color, |
| const sk_sp<SkShader>& shader) { |
| static const char text[] = "Now is the time for all good"; |
| SkPaint paint; |
| paint.setColor(color); |
| canvas->drawString(text, 10, 20, font, paint); |
| paint.setShader(SkShaders::Color(paint.getColor())); |
| canvas->drawString(text, 10, 40, font, paint); |
| paint.setShader(shader); |
| canvas->drawString(text, 10, 60, font, paint); |
| } |
| |
| class GammaShaderTextGM : public skiagm::GM { |
| sk_sp<SkShader> fShaders[3]; |
| SkColor fColors[3]; |
| |
| public: |
| GammaShaderTextGM() { |
| const SkColor colors[] = { SK_ColorBLACK, SK_ColorRED, SK_ColorBLUE }; |
| for (size_t i = 0; i < std::size(fShaders); ++i) { |
| fColors[i] = colors[i]; |
| } |
| } |
| |
| protected: |
| SkString onShortName() override { |
| return SkString("gammagradienttext"); |
| } |
| |
| SkISize onISize() override { |
| return SkISize::Make(300, 300); |
| } |
| |
| void onOnceBeforeDraw() override { |
| for (size_t i = 0; i < std::size(fShaders); ++i) { |
| fShaders[i] = make_gradient(fColors[i]); |
| } |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| SkFont font(SkTypeface::MakeFromName("serif", SkFontStyle::Italic()), 18); |
| font.setEdging(SkFont::Edging::kSubpixelAntiAlias); |
| |
| for (size_t i = 0; i < std::size(fShaders); ++i) { |
| draw_pair(canvas, font, fColors[i], fShaders[i]); |
| canvas->translate(0, 80); |
| } |
| } |
| |
| private: |
| using INHERITED = skiagm::GM; |
| }; |
| |
| DEF_GM( return new GammaShaderTextGM; ) |