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      1 /*
      2  * Copyright 2017 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 "gm.h"
      9 
     10 #if SK_SUPPORT_GPU
     11 #include "GrContext.h"
     12 
     13 // This test exercises Ganesh's drawing of tiled bitmaps. In particular, that the offsets and the
     14 // extents of the tiles don't causes gaps between tiles.
     15 static void draw_tile_bitmap_with_fractional_offset(SkCanvas* canvas, bool vertical) {
     16     GrContext* context = canvas->getGrContext();
     17     if (!context) {
     18         skiagm::GM::DrawGpuOnlyMessage(canvas);
     19         return;
     20     }
     21 
     22     // This should match kBmpSmallTileSize in SkGpuDevice.cpp. Note that our canvas size is tuned
     23     // to this constant as well.
     24     const int kTileSize = 1 << 10;
     25 
     26     // We're going to draw a section of the bitmap that intersects 3 tiles (3x1 or 1x3).
     27     // We need that to be < 50% of the total image, so our image is 7 tiles (7x1 or 1x7).
     28     const int kBitmapLongEdge = 7 * kTileSize;
     29     const int kBitmapShortEdge = 1 * kTileSize;
     30 
     31     // To trigger tiling, we also need the image to be more than 50% of the cache, so we ensure the
     32     // cache is sized to make that true.
     33     const int kBitmapArea = kBitmapLongEdge * kBitmapShortEdge;
     34     const size_t kBitmapBytes = kBitmapArea * sizeof(SkPMColor);
     35 
     36     int oldMaxResources;
     37     size_t oldMaxResourceBytes;
     38     context->getResourceCacheLimits(&oldMaxResources, &oldMaxResourceBytes);
     39 
     40     const size_t newMaxResourceBytes = kBitmapBytes + (kBitmapBytes / 2);
     41     context->setResourceCacheLimits(oldMaxResources, newMaxResourceBytes);
     42 
     43     // Construct our bitmap as either very wide or very tall
     44     SkBitmap bmp;
     45     bmp.allocN32Pixels(vertical ? kBitmapShortEdge : kBitmapLongEdge,
     46                        vertical ? kBitmapLongEdge : kBitmapShortEdge, true);
     47     bmp.eraseColor(SK_ColorWHITE);
     48 
     49     // Draw ten strips with varying fractional offset to catch any rasterization issues with tiling
     50     for (int i = 0; i < 10; ++i) {
     51         float offset = i * 0.1f;
     52         if (vertical) {
     53             canvas->drawBitmapRect(bmp, SkRect::MakeXYWH(0.0f, (kTileSize - 50) + offset,
     54                                                          32.0f, 1124.0f),
     55                                    SkRect::MakeXYWH(37.0f * i, 0.0f, 32.0f, 1124.0f), nullptr);
     56         } else {
     57             canvas->drawBitmapRect(bmp, SkRect::MakeXYWH((kTileSize - 50) + offset, 0.0f,
     58                                                          1124.0f, 32.0f),
     59                                    SkRect::MakeXYWH(0.0f, 37.0f * i, 1124.0f, 32.0f), nullptr);
     60         }
     61     }
     62 
     63     // Restore the cache
     64     context->setResourceCacheLimits(oldMaxResources, oldMaxResourceBytes);
     65 }
     66 
     67 DEF_SIMPLE_GM_BG(bitmaptiled_fractional_horizontal, canvas, 1124, 365, SK_ColorBLACK) {
     68     draw_tile_bitmap_with_fractional_offset(canvas, false);
     69 }
     70 
     71 DEF_SIMPLE_GM_BG(bitmaptiled_fractional_vertical, canvas, 365, 1124, SK_ColorBLACK) {
     72     draw_tile_bitmap_with_fractional_offset(canvas, true);
     73 }
     74 
     75 #endif
     76