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      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
     72