src/third_party/skia/samplecode/SampleTextureDomain.cpp

   1 /*
   2  * Copyright 2011 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 "SampleCode.h"
   9 #include "SkBlurMask.h"
  10 #include "SkBlurMaskFilter.h"
  11 #include "SkCanvas.h"
  12 #include "SkSurface.h"
  13
  14 static SkBitmap make_bitmap() {
  15     SkBitmap bm;
  16     bm.allocN32Pixels(5, 5);
  17
  18     for (int y = 0; y < bm.height(); y++) {
  19         uint32_t* p = bm.getAddr32(0, y);
  20         for (int x = 0; x < bm.width(); x++) {
  21             p[x] = ((x + y) & 1) ? SK_ColorWHITE : SK_ColorBLACK;
  22         }
  23     }
  24     bm.unlockPixels();
  25     return bm;
  26 }
  27
  28 class TextureDomainView : public SampleView {
  29     SkBitmap    fBM;
  30
  31 public:
  32     TextureDomainView(){
  33         fBM = make_bitmap();
  34     }
  35
  36 protected:
  37     // overrides from SkEventSink
  38     virtual bool onQuery(SkEvent* evt) {
  39         if (SampleCode::TitleQ(*evt)) {
  40             SampleCode::TitleR(evt, "Texture Domain");
  41             return true;
  42         }
  43         return this->INHERITED::onQuery(evt);
  44     }
  45
  46     virtual void onDrawContent(SkCanvas* canvas) {
  47         SkRect srcRect;
  48         SkRect dstRect;
  49         SkPaint paint;
  50         paint.setFilterLevel(SkPaint::kLow_FilterLevel);
  51
  52         // Test that bitmap draws from malloc-backed bitmaps respect
  53         // the constrained texture domain.
  54         srcRect.setXYWH(1, 1, 3, 3);
  55         dstRect.setXYWH(5, 5, 305, 305);
  56         canvas->drawBitmapRectToRect(fBM, &srcRect, dstRect, &paint);
  57
  58         // Test that bitmap draws across separate devices also respect
  59         // the constrainted texture domain.
  60         // Note:  GPU-backed bitmaps follow a different rendering path
  61         // when copying from one GPU device to another.
  62         SkImageInfo info = SkImageInfo::MakeN32(5, 5, kOpaque_SkAlphaType);
  63         SkAutoTUnref<SkSurface> surface(canvas->newSurface(info));
  64
  65         srcRect.setXYWH(1, 1, 3, 3);
  66         dstRect.setXYWH(1, 1, 3, 3);
  67         surface->getCanvas()->drawBitmapRectToRect(fBM, &srcRect, dstRect,
  68                                                    &paint);
  69
  70         SkAutoTUnref<SkImage> image(surface->newImageSnapshot());
  71
  72         srcRect.setXYWH(1, 1, 3, 3);
  73         dstRect.setXYWH(405, 5, 305, 305);
  74         image->draw(canvas, &srcRect, dstRect, &paint);
  75
  76         // Test that bitmap blurring using a subrect
  77         // renders correctly
  78         srcRect.setXYWH(1, 1, 3, 3);
  79         dstRect.setXYWH(5, 405, 305, 305);
  80         SkMaskFilter* mf = SkBlurMaskFilter::Create(
  81             kNormal_SkBlurStyle,
  82             SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(5)),
  83             SkBlurMaskFilter::kHighQuality_BlurFlag |
  84             SkBlurMaskFilter::kIgnoreTransform_BlurFlag);
  85         paint.setMaskFilter(mf)->unref();
  86         image->draw(canvas, &srcRect, dstRect, &paint);
  87
  88         // Blur and a rotation + NULL src rect
  89         // This should not trigger the texture domain code
  90         // but it will test a code path in SkGpuDevice::drawBitmap
  91         // that handles blurs with rects transformed to non-
  92         // orthogonal rects. It also tests the NULL src rect handling
  93         mf = SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
  94                                       SkBlurMask::ConvertRadiusToSigma(5),
  95                                       SkBlurMaskFilter::kHighQuality_BlurFlag);
  96         paint.setMaskFilter(mf)->unref();
  97
  98         dstRect.setXYWH(-150, -150, 300, 300);
  99         canvas->translate(550, 550);
 100         canvas->rotate(45);
 101         canvas->drawBitmapRectToRect(fBM, NULL, dstRect, &paint);
 102     }
 103 private:
 104     typedef SkView INHERITED;
 105 };
 106
 107 //////////////////////////////////////////////////////////////////////////////
 108
 109 static SkView* MyFactory() { return new TextureDomainView; }
 110 static SkViewRegister reg(MyFactory);