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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "GrContext.h"
// This test exercises Ganesh's drawing of tiled bitmaps. In particular, that the offsets and the
// extents of the tiles don't causes gaps between tiles.
static void draw_tile_bitmap_with_fractional_offset(SkCanvas* canvas, bool vertical) {
GrContext* context = canvas->getGrContext();
if (!context) {
skiagm::GM::DrawGpuOnlyMessage(canvas);
return;
}
// This should match kBmpSmallTileSize in SkGpuDevice.cpp. Note that our canvas size is tuned
// to this constant as well.
const int kTileSize = 1 << 10;
// We're going to draw a section of the bitmap that intersects 3 tiles (3x1 or 1x3).
// We need that to be < 50% of the total image, so our image is 7 tiles (7x1 or 1x7).
const int kBitmapLongEdge = 7 * kTileSize;
const int kBitmapShortEdge = 1 * kTileSize;
// To trigger tiling, we also need the image to be more than 50% of the cache, so we ensure the
// cache is sized to make that true.
const int kBitmapArea = kBitmapLongEdge * kBitmapShortEdge;
const size_t kBitmapBytes = kBitmapArea * sizeof(SkPMColor);
int oldMaxResources;
size_t oldMaxResourceBytes;
context->getResourceCacheLimits(&oldMaxResources, &oldMaxResourceBytes);
const size_t newMaxResourceBytes = kBitmapBytes + (kBitmapBytes / 2);
context->setResourceCacheLimits(oldMaxResources, newMaxResourceBytes);
// Construct our bitmap as either very wide or very tall
SkBitmap bmp;
bmp.allocN32Pixels(vertical ? kBitmapShortEdge : kBitmapLongEdge,
vertical ? kBitmapLongEdge : kBitmapShortEdge, true);
bmp.eraseColor(SK_ColorWHITE);
// Draw ten strips with varying fractional offset to catch any rasterization issues with tiling
for (int i = 0; i < 10; ++i) {
float offset = i * 0.1f;
if (vertical) {
canvas->drawBitmapRect(bmp, SkRect::MakeXYWH(0.0f, (kTileSize - 50) + offset,
32.0f, 1124.0f),
SkRect::MakeXYWH(37.0f * i, 0.0f, 32.0f, 1124.0f), nullptr);
} else {
canvas->drawBitmapRect(bmp, SkRect::MakeXYWH((kTileSize - 50) + offset, 0.0f,
1124.0f, 32.0f),
SkRect::MakeXYWH(0.0f, 37.0f * i, 1124.0f, 32.0f), nullptr);
}
}
// Restore the cache
context->setResourceCacheLimits(oldMaxResources, oldMaxResourceBytes);
}
DEF_SIMPLE_GM_BG(bitmaptiled_fractional_horizontal, canvas, 1124, 365, SK_ColorBLACK) {
draw_tile_bitmap_with_fractional_offset(canvas, false);
}
DEF_SIMPLE_GM_BG(bitmaptiled_fractional_vertical, canvas, 365, 1124, SK_ColorBLACK) {
draw_tile_bitmap_with_fractional_offset(canvas, true);
}
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