SampleClipDrawMatch.cpp 8.4 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/SkPath.h"
  9. #include "include/core/SkRRect.h"
  10. #include "include/core/SkTime.h"
  11. #include "include/utils/SkInterpolator.h"
  12. #include "samplecode/Sample.h"
  13. // This slide tests out the match up between BW clipping and rendering. It can
  14. // draw a large rect through some clip geometry and draw the same geometry
  15. // normally. Which one is drawn first can be toggled. The pair of objects is translated
  16. // fractionally (via an animator) to expose snapping bugs. The key bindings are:
  17. // 1-9: the different geometries
  18. // t: toggle which is drawn first the clip or the normal geometry
  19. // f: flip-flops which corner the bottom AA clip rect occupies in the complex clip cases
  20. // The possible geometric combinations to test
  21. enum Geometry {
  22. kRect_Geometry,
  23. kRRect_Geometry,
  24. kCircle_Geometry,
  25. kConvexPath_Geometry,
  26. kConcavePath_Geometry,
  27. kRectAndRect_Geometry,
  28. kRectAndRRect_Geometry,
  29. kRectAndConvex_Geometry,
  30. kRectAndConcave_Geometry
  31. };
  32. // The basic rect used is [kMin,kMin]..[kMax,kMax]
  33. static const float kMin = 100.5f;
  34. static const float kMid = 200.0f;
  35. static const float kMax = 299.5f;
  36. // The translation applied to the base AA rect in the combination cases
  37. // (i.e., kRectAndRect through kRectAndConcave)
  38. static const float kXlate = 100.0f;
  39. SkRect create_rect(const SkPoint& offset) {
  40. SkRect r = SkRect::MakeLTRB(kMin, kMin, kMax, kMax);
  41. r.offset(offset);
  42. return r;
  43. }
  44. SkRRect create_rrect(const SkPoint& offset) {
  45. SkRRect rrect;
  46. rrect.setRectXY(create_rect(offset), 10, 10);
  47. return rrect;
  48. }
  49. SkRRect create_circle(const SkPoint& offset) {
  50. SkRRect circle;
  51. circle.setOval(create_rect(offset));
  52. return circle;
  53. }
  54. SkPath create_convex_path(const SkPoint& offset) {
  55. SkPath convexPath;
  56. convexPath.moveTo(kMin, kMin);
  57. convexPath.lineTo(kMax, kMax);
  58. convexPath.lineTo(kMin, kMax);
  59. convexPath.close();
  60. convexPath.offset(offset.fX, offset.fY);
  61. return convexPath;
  62. }
  63. SkPath create_concave_path(const SkPoint& offset) {
  64. SkPath concavePath;
  65. concavePath.moveTo(kMin, kMin);
  66. concavePath.lineTo(kMid, 105.0f);
  67. concavePath.lineTo(kMax, kMin);
  68. concavePath.lineTo(295.0f, kMid);
  69. concavePath.lineTo(kMax, kMax);
  70. concavePath.lineTo(kMid, 295.0f);
  71. concavePath.lineTo(kMin, kMax);
  72. concavePath.lineTo(105.0f, kMid);
  73. concavePath.close();
  74. concavePath.offset(offset.fX, offset.fY);
  75. return concavePath;
  76. }
  77. static void draw_normal_geom(SkCanvas* canvas, const SkPoint& offset, int geom, bool useAA) {
  78. SkPaint p;
  79. p.setAntiAlias(useAA);
  80. p.setColor(SK_ColorBLACK);
  81. switch (geom) {
  82. case kRect_Geometry: // fall thru
  83. case kRectAndRect_Geometry:
  84. canvas->drawRect(create_rect(offset), p);
  85. break;
  86. case kRRect_Geometry: // fall thru
  87. case kRectAndRRect_Geometry:
  88. canvas->drawRRect(create_rrect(offset), p);
  89. break;
  90. case kCircle_Geometry:
  91. canvas->drawRRect(create_circle(offset), p);
  92. break;
  93. case kConvexPath_Geometry: // fall thru
  94. case kRectAndConvex_Geometry:
  95. canvas->drawPath(create_convex_path(offset), p);
  96. break;
  97. case kConcavePath_Geometry: // fall thru
  98. case kRectAndConcave_Geometry:
  99. canvas->drawPath(create_concave_path(offset), p);
  100. break;
  101. }
  102. }
  103. class ClipDrawMatchView : public Sample {
  104. SkInterpolator fTrans;
  105. Geometry fGeom;
  106. bool fClipFirst = true;
  107. int fSign = 1;
  108. const double fStart = SkTime::GetMSecs();
  109. public:
  110. ClipDrawMatchView() : fTrans(2, 5), fGeom(kRect_Geometry) {}
  111. private:
  112. void onOnceBeforeDraw() override {
  113. SkScalar values[2];
  114. fTrans.setRepeatCount(999);
  115. values[0] = values[1] = 0;
  116. fTrans.setKeyFrame(0, GetMSecs() + 1000, values);
  117. values[1] = 1;
  118. fTrans.setKeyFrame(1, GetMSecs() + 2000, values);
  119. values[0] = values[1] = 1;
  120. fTrans.setKeyFrame(2, GetMSecs() + 3000, values);
  121. values[1] = 0;
  122. fTrans.setKeyFrame(3, GetMSecs() + 4000, values);
  123. values[0] = 0;
  124. fTrans.setKeyFrame(4, GetMSecs() + 5000, values);
  125. }
  126. SkString name() override { return SkString("ClipDrawMatch"); }
  127. bool onChar(SkUnichar uni) override {
  128. switch (uni) {
  129. case '1': fGeom = kRect_Geometry; return true;
  130. case '2': fGeom = kRRect_Geometry; return true;
  131. case '3': fGeom = kCircle_Geometry; return true;
  132. case '4': fGeom = kConvexPath_Geometry; return true;
  133. case '5': fGeom = kConcavePath_Geometry; return true;
  134. case '6': fGeom = kRectAndRect_Geometry; return true;
  135. case '7': fGeom = kRectAndRRect_Geometry; return true;
  136. case '8': fGeom = kRectAndConvex_Geometry; return true;
  137. case '9': fGeom = kRectAndConcave_Geometry; return true;
  138. case 'f': fSign = -fSign; return true;
  139. case 't': fClipFirst = !fClipFirst; return true;
  140. default: break;
  141. }
  142. return false;
  143. }
  144. void drawClippedGeom(SkCanvas* canvas, const SkPoint& offset, bool useAA) {
  145. int count = canvas->save();
  146. switch (fGeom) {
  147. case kRect_Geometry:
  148. canvas->clipRect(create_rect(offset), useAA);
  149. break;
  150. case kRRect_Geometry:
  151. canvas->clipRRect(create_rrect(offset), useAA);
  152. break;
  153. case kCircle_Geometry:
  154. canvas->clipRRect(create_circle(offset), useAA);
  155. break;
  156. case kConvexPath_Geometry:
  157. canvas->clipPath(create_convex_path(offset), useAA);
  158. break;
  159. case kConcavePath_Geometry:
  160. canvas->clipPath(create_concave_path(offset), useAA);
  161. break;
  162. case kRectAndRect_Geometry: {
  163. SkRect r = create_rect(offset);
  164. r.offset(fSign * kXlate, fSign * kXlate);
  165. canvas->clipRect(r, true); // AA here forces shader clips
  166. canvas->clipRect(create_rect(offset), useAA);
  167. } break;
  168. case kRectAndRRect_Geometry: {
  169. SkRect r = create_rect(offset);
  170. r.offset(fSign * kXlate, fSign * kXlate);
  171. canvas->clipRect(r, true); // AA here forces shader clips
  172. canvas->clipRRect(create_rrect(offset), useAA);
  173. } break;
  174. case kRectAndConvex_Geometry: {
  175. SkRect r = create_rect(offset);
  176. r.offset(fSign * kXlate, fSign * kXlate);
  177. canvas->clipRect(r, true); // AA here forces shader clips
  178. canvas->clipPath(create_convex_path(offset), useAA);
  179. } break;
  180. case kRectAndConcave_Geometry: {
  181. SkRect r = create_rect(offset);
  182. r.offset(fSign * kXlate, fSign * kXlate);
  183. canvas->clipRect(r, true); // AA here forces shader clips
  184. canvas->clipPath(create_concave_path(offset), useAA);
  185. } break;
  186. }
  187. SkISize size = canvas->getBaseLayerSize();
  188. SkRect bigR = SkRect::MakeWH(SkIntToScalar(size.width()), SkIntToScalar(size.height()));
  189. SkPaint p;
  190. p.setColor(SK_ColorRED);
  191. canvas->drawRect(bigR, p);
  192. canvas->restoreToCount(count);
  193. }
  194. // Draw a big red rect through some clip geometry and also draw that same
  195. // geometry in black. The order in which they are drawn can be swapped.
  196. // This tests whether the clip and normally drawn geometry match up.
  197. void drawGeometry(SkCanvas* canvas, const SkPoint& offset, bool useAA) {
  198. if (fClipFirst) {
  199. this->drawClippedGeom(canvas, offset, useAA);
  200. }
  201. draw_normal_geom(canvas, offset, fGeom, useAA);
  202. if (!fClipFirst) {
  203. this->drawClippedGeom(canvas, offset, useAA);
  204. }
  205. }
  206. void onDrawContent(SkCanvas* canvas) override {
  207. SkScalar trans[2];
  208. fTrans.timeToValues(GetMSecs(), trans);
  209. SkPoint offset;
  210. offset.set(trans[0], trans[1]);
  211. int saveCount = canvas->save();
  212. this->drawGeometry(canvas, offset, false);
  213. canvas->restoreToCount(saveCount);
  214. }
  215. SkMSec GetMSecs() const {
  216. return static_cast<SkMSec>(SkTime::GetMSecs() - fStart);
  217. }
  218. };
  219. DEF_SAMPLE( return new ClipDrawMatchView(); )