SampleXfer.cpp 5.6 KB

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  1. /*
  2. * Copyright 2015 Google Inc.
  3. *
  4. * Use of this source code is governed by a BSD-style license that can be
  5. * found in the LICENSE file.
  6. */
  7. #include "include/core/SkCanvas.h"
  8. #include "include/core/SkDrawable.h"
  9. #include "include/core/SkPath.h"
  10. #include "include/core/SkRSXform.h"
  11. #include "include/core/SkString.h"
  12. #include "include/core/SkSurface.h"
  13. #include "include/effects/SkGradientShader.h"
  14. #include "include/utils/SkRandom.h"
  15. #include "include/utils/SkTextUtils.h"
  16. #include "samplecode/Sample.h"
  17. const SkBlendMode gModes[] = {
  18. SkBlendMode::kSrcOver,
  19. SkBlendMode::kSrc,
  20. SkBlendMode::kSrcIn,
  21. SkBlendMode::kSrcOut,
  22. SkBlendMode::kSrcATop,
  23. SkBlendMode::kDstOver,
  24. SkBlendMode::kDstIn,
  25. SkBlendMode::kDstOut,
  26. SkBlendMode::kDstATop,
  27. };
  28. const int N_Modes = SK_ARRAY_COUNT(gModes);
  29. static SkRandom gRand;
  30. struct ModeButton {
  31. SkString fLabel;
  32. SkColor fColor;
  33. SkRect fRect;
  34. public:
  35. void init(const char label[], const SkRect& rect) {
  36. fLabel = label;
  37. fRect = rect;
  38. fColor = (gRand.nextU() & 0x7F7F7F7F) | SkColorSetARGB(0xFF, 0, 0, 0x80);
  39. }
  40. void draw(SkCanvas* canvas) {
  41. SkPaint paint;
  42. paint.setAntiAlias(true);
  43. paint.setColor(fColor);
  44. canvas->drawRoundRect(fRect, 8, 8, paint);
  45. paint.setColor(0xFFFFFFFF);
  46. SkFont font;
  47. font.setSize(16);
  48. font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
  49. SkTextUtils::DrawString(canvas, fLabel.c_str(), fRect.centerX(), fRect.fTop + 0.68f * fRect.height(),
  50. font, paint, SkTextUtils::kCenter_Align);
  51. }
  52. bool hitTest(SkScalar x, SkScalar y) {
  53. return fRect.intersects(x - 1, y - 1, x + 1, y + 1);
  54. }
  55. };
  56. class ModeDrawable : public SkDrawable {
  57. public:
  58. ModeDrawable() : fMode(SkBlendMode::kSrcOver), fLoc(SkPoint::Make(0, 0)) {}
  59. SkBlendMode fMode;
  60. SkPoint fLoc;
  61. bool hitTest(SkScalar x, SkScalar y) {
  62. SkRect target = SkRect::MakeXYWH(x - fLoc.x() - 1, y - fLoc.y() - 1, 3, 3);
  63. return this->getBounds().intersects(target);
  64. }
  65. };
  66. class CircDrawable : public ModeDrawable {
  67. SkPaint fPaint;
  68. SkRect fBounds;
  69. public:
  70. CircDrawable(SkScalar size, SkColor c) {
  71. const SkColor colors[] = { 0, c };
  72. fPaint.setShader(SkGradientShader::MakeRadial(SkPoint::Make(size/2, size/2), size/2,
  73. colors, nullptr, 2,
  74. SkTileMode::kClamp));
  75. fBounds = SkRect::MakeWH(size, size);
  76. }
  77. protected:
  78. SkRect onGetBounds() override {
  79. return fBounds;
  80. }
  81. void onDraw(SkCanvas* canvas) override {
  82. fPaint.setBlendMode(fMode);
  83. canvas->save();
  84. canvas->translate(fLoc.x(), fLoc.y());
  85. canvas->drawOval(fBounds, fPaint);
  86. canvas->restore();
  87. }
  88. };
  89. class XferDemo : public Sample {
  90. enum {
  91. N = 4
  92. };
  93. SkRect fModeRect[N_Modes];
  94. ModeButton fModeButtons[N_Modes];
  95. sk_sp<CircDrawable> fDrs[N];
  96. CircDrawable* fSelected;
  97. void addButtons() {
  98. SkScalar x = 10;
  99. SkScalar y = 10;
  100. for (int i = 0; i < N_Modes; ++i) {
  101. fModeButtons[i].init(SkBlendMode_Name(gModes[i]), SkRect::MakeXYWH(x, y, 70, 25));
  102. fModeRect[i] = SkRect::MakeXYWH(x, y + 28, 70, 2);
  103. x += 80;
  104. }
  105. }
  106. public:
  107. XferDemo() {
  108. const SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorBLACK };
  109. for (int i = 0; i < N; ++i) {
  110. fDrs[i].reset(new CircDrawable(200, colors[i]));
  111. fDrs[i]->fLoc.set(100.f + i * 100, 100.f + i * 100);
  112. fDrs[i]->fMode = SkBlendMode::kSrcOver;
  113. }
  114. fSelected = nullptr;
  115. this->addButtons();
  116. }
  117. protected:
  118. SkString name() override { return SkString("XferDemo"); }
  119. void onDrawContent(SkCanvas* canvas) override {
  120. for (int i = 0; i < N_Modes; ++i) {
  121. fModeButtons[i].draw(canvas);
  122. }
  123. SkPaint paint;
  124. if (fSelected) {
  125. for (int i = 0; i < N_Modes; ++i) {
  126. if (fSelected->fMode == gModes[i]) {
  127. canvas->drawRect(fModeRect[i], paint);
  128. break;
  129. }
  130. }
  131. }
  132. canvas->saveLayer(nullptr, nullptr);
  133. for (int i = 0; i < N; ++i) {
  134. fDrs[i]->draw(canvas);
  135. }
  136. canvas->restore();
  137. }
  138. Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, ModifierKey) override {
  139. // Check mode buttons first
  140. for (int i = 0; i < N_Modes; ++i) {
  141. if (fModeButtons[i].hitTest(x, y)) {
  142. Click* click = new Click();
  143. click->fMeta.setS32("mode", i);
  144. return click;
  145. }
  146. }
  147. fSelected = nullptr;
  148. for (int i = N - 1; i >= 0; --i) {
  149. if (fDrs[i]->hitTest(x, y)) {
  150. fSelected = fDrs[i].get();
  151. break;
  152. }
  153. }
  154. return fSelected ? new Click() : nullptr;
  155. }
  156. bool onClick(Click* click) override {
  157. int32_t mode;
  158. if (click->fMeta.findS32("mode", &mode)) {
  159. if (fSelected && InputState::kUp == click->fState) {
  160. fSelected->fMode = gModes[mode];
  161. }
  162. } else {
  163. fSelected->fLoc.fX += click->fCurr.fX - click->fPrev.fX;
  164. fSelected->fLoc.fY += click->fCurr.fY - click->fPrev.fY;
  165. }
  166. return true;
  167. }
  168. private:
  169. typedef Sample INHERITED;
  170. };
  171. //////////////////////////////////////////////////////////////////////////////
  172. DEF_SAMPLE( return new XferDemo; )