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      1 /*
      2  * Copyright 2016 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 "SkBitmap.h"
      9 #include "SkCanvas.h"
     10 #include "SkImage.h"
     11 #include "SkSpecialImage.h"
     12 #include "SkSpecialSurface.h"
     13 #include "Test.h"
     14 
     15 #if SK_SUPPORT_GPU
     16 #include "GrContext.h"
     17 #endif
     18 
     19 class TestingSpecialImageAccess {
     20 public:
     21     static const SkIRect& Subset(const SkSpecialImage* img) {
     22         return img->subset();
     23     }
     24 
     25     static bool PeekPixels(const SkSpecialImage* img, SkPixmap* pixmap) {
     26         return img->peekPixels(pixmap);
     27     }
     28 
     29     static GrTexture* PeekTexture(const SkSpecialImage* img) {
     30         return img->peekTexture();
     31     }
     32 };
     33 
     34 // This test creates backing resources exactly sized to [kFullSize x kFullSize].
     35 // It then wraps them in an SkSpecialImage with only the center (red) region being active.
     36 // It then draws the SkSpecialImage to a full sized (all blue) canvas and checks that none
     37 // of the inactive (green) region leaked out.
     38 
     39 static const int kSmallerSize = 10;
     40 static const int kPad = 3;
     41 static const int kFullSize = kSmallerSize + 2 * kPad;
     42 
     43 // Create a bitmap with red in the center and green around it
     44 static SkBitmap create_bm() {
     45     SkBitmap bm;
     46     bm.allocN32Pixels(kFullSize, kFullSize, true);
     47 
     48     SkCanvas temp(bm);
     49 
     50     temp.clear(SK_ColorGREEN);
     51     SkPaint p;
     52     p.setColor(SK_ColorRED);
     53     p.setAntiAlias(false);
     54 
     55     temp.drawRect(SkRect::MakeXYWH(SkIntToScalar(kPad), SkIntToScalar(kPad),
     56                                    SkIntToScalar(kSmallerSize), SkIntToScalar(kSmallerSize)),
     57                   p);
     58 
     59     return bm;
     60 }
     61 
     62 // Basic test of the SkSpecialImage public API (e.g., peekTexture, peekPixels & draw)
     63 static void test_image(SkSpecialImage* img, skiatest::Reporter* reporter,
     64                        bool peekPixelsSucceeds, bool peekTextureSucceeds) {
     65     const SkIRect subset = TestingSpecialImageAccess::Subset(img);
     66     REPORTER_ASSERT(reporter, kPad == subset.left());
     67     REPORTER_ASSERT(reporter, kPad == subset.top());
     68     REPORTER_ASSERT(reporter, kSmallerSize == subset.width());
     69     REPORTER_ASSERT(reporter, kSmallerSize == subset.height());
     70 
     71     //--------------
     72     REPORTER_ASSERT(reporter, peekTextureSucceeds == !!TestingSpecialImageAccess::PeekTexture(img));
     73 
     74     //--------------
     75     SkPixmap pixmap;
     76     REPORTER_ASSERT(reporter, peekPixelsSucceeds ==
     77                               !!TestingSpecialImageAccess::PeekPixels(img, &pixmap));
     78     if (peekPixelsSucceeds) {
     79         REPORTER_ASSERT(reporter, kFullSize == pixmap.width());
     80         REPORTER_ASSERT(reporter, kFullSize == pixmap.height());
     81     }
     82 
     83     //--------------
     84     SkImageInfo info = SkImageInfo::MakeN32(kFullSize, kFullSize, kOpaque_SkAlphaType);
     85 
     86     SkAutoTUnref<SkSpecialSurface> surf(img->newSurface(info));
     87 
     88     SkCanvas* canvas = surf->getCanvas();
     89 
     90     canvas->clear(SK_ColorBLUE);
     91     img->draw(canvas, SkIntToScalar(kPad), SkIntToScalar(kPad), nullptr);
     92 
     93     SkBitmap bm;
     94     bm.allocN32Pixels(kFullSize, kFullSize, true);
     95 
     96     bool result = canvas->readPixels(bm.info(), bm.getPixels(), bm.rowBytes(), 0, 0);
     97     SkASSERT_RELEASE(result);
     98 
     99     // Only the center (red) portion should've been drawn into the canvas
    100     REPORTER_ASSERT(reporter, SK_ColorBLUE == bm.getColor(kPad-1, kPad-1));
    101     REPORTER_ASSERT(reporter, SK_ColorRED  == bm.getColor(kPad, kPad));
    102     REPORTER_ASSERT(reporter, SK_ColorRED  == bm.getColor(kSmallerSize+kPad-1,
    103                                                           kSmallerSize+kPad-1));
    104     REPORTER_ASSERT(reporter, SK_ColorBLUE == bm.getColor(kSmallerSize+kPad,
    105                                                           kSmallerSize+kPad));
    106 }
    107 
    108 DEF_TEST(SpecialImage_Raster, reporter) {
    109     SkBitmap bm = create_bm();
    110 
    111     const SkIRect& subset = SkIRect::MakeXYWH(kPad, kPad, kSmallerSize, kSmallerSize);
    112 
    113     SkAutoTUnref<SkSpecialImage> img(SkSpecialImage::NewFromRaster(nullptr, subset, bm));
    114     test_image(img, reporter, true, false);
    115 }
    116 
    117 DEF_TEST(SpecialImage_Image, reporter) {
    118     SkBitmap bm = create_bm();
    119 
    120     SkAutoTUnref<SkImage> fullImage(SkImage::NewFromBitmap(bm));
    121 
    122     const SkIRect& subset = SkIRect::MakeXYWH(kPad, kPad, kSmallerSize, kSmallerSize);
    123 
    124     SkAutoTUnref<SkSpecialImage> img(SkSpecialImage::NewFromImage(subset, fullImage));
    125     test_image(img, reporter, true, false);
    126 }
    127 
    128 #if SK_SUPPORT_GPU
    129 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialImage_Gpu, reporter, context) {
    130     SkBitmap bm = create_bm();
    131 
    132     GrSurfaceDesc desc;
    133     desc.fConfig = kSkia8888_GrPixelConfig;
    134     desc.fFlags  = kNone_GrSurfaceFlags;
    135     desc.fWidth  = kFullSize;
    136     desc.fHeight = kFullSize;
    137 
    138     SkAutoTUnref<GrTexture> texture(context->textureProvider()->createTexture(desc, SkBudgeted::kNo,
    139                                                                               bm.getPixels(), 0));
    140     if (!texture) {
    141         return;
    142     }
    143 
    144     const SkIRect& subset = SkIRect::MakeXYWH(kPad, kPad, kSmallerSize, kSmallerSize);
    145 
    146     SkAutoTUnref<SkSpecialImage> img(SkSpecialImage::NewFromGpu(nullptr, subset,
    147                                                                 kNeedNewImageUniqueID_SpecialImage,
    148                                                                 texture));
    149     test_image(img, reporter, false, true);
    150 }
    151 
    152 #endif
    153