src/third_party/skia/tests/CanvasStateHelpers.cpp

   1 /*
   2  * Copyright 2014 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
   8 #include "CanvasStateHelpers.h"
   9 #ifdef SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG
  10 #include "SkCanvas.h"
  11 #include "SkCanvasStateUtils.h"
  12 #include "SkPaint.h"
  13 #include "SkRect.h"
  14 #include "SkRegion.h"
  15
  16 void complex_layers_draw(SkCanvas* canvas, float left, float top,
  17                          float right, float bottom, int32_t spacer) {
  18     SkPaint bluePaint;
  19     bluePaint.setColor(SK_ColorBLUE);
  20     bluePaint.setStyle(SkPaint::kFill_Style);
  21
  22     SkRect rect = SkRect::MakeLTRB(left, top, right, bottom);
  23     canvas->drawRect(rect, bluePaint);
  24     canvas->translate(0, rect.height() + spacer);
  25     canvas->drawRect(rect, bluePaint);
  26 }
  27
  28 extern "C" bool complex_layers_draw_from_canvas_state(SkCanvasState* state,
  29         float left, float top, float right, float bottom, int32_t spacer) {
  30     SkCanvas* canvas = SkCanvasStateUtils::CreateFromCanvasState(state);
  31     if (!canvas) {
  32         return false;
  33     }
  34     complex_layers_draw(canvas, left, top, right, bottom, spacer);
  35     canvas->unref();
  36     return true;
  37 }
  38
  39 void complex_clips_draw(SkCanvas* canvas, int32_t left, int32_t top,
  40         int32_t right, int32_t bottom, int32_t clipOp, const SkRegion& localRegion) {
  41     canvas->save();
  42     SkRect clipRect = SkRect::MakeLTRB(SkIntToScalar(left), SkIntToScalar(top),
  43                                        SkIntToScalar(right), SkIntToScalar(bottom));
  44     canvas->clipRect(clipRect, (SkRegion::Op) clipOp);
  45     canvas->drawColor(SK_ColorBLUE);
  46     canvas->restore();
  47
  48     canvas->clipRegion(localRegion, (SkRegion::Op) clipOp);
  49     canvas->drawColor(SK_ColorBLUE);
  50 }
  51
  52 extern "C" bool complex_clips_draw_from_canvas_state(SkCanvasState* state,
  53         int32_t left, int32_t top, int32_t right, int32_t bottom, int32_t clipOp,
  54         int32_t regionRects, int32_t* rectCoords) {
  55     SkCanvas* canvas = SkCanvasStateUtils::CreateFromCanvasState(state);
  56     if (!canvas) {
  57         return false;
  58     }
  59
  60     SkRegion localRegion;
  61     for (int32_t i = 0; i < regionRects; ++i) {
  62         localRegion.op(rectCoords[0], rectCoords[1], rectCoords[2], rectCoords[3],
  63                        SkRegion::kUnion_Op);
  64         rectCoords += 4;
  65     }
  66
  67     complex_clips_draw(canvas, left, top, right, bottom, clipOp, localRegion);
  68     canvas->unref();
  69     return true;
  70 }
  71 #endif // SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG