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