static bool check_rect(GrDrawContext* dc, const SkIRect& rect, uint32_t expectedValue,
uint32_t* actualValue, int* failX, int* failY) {
GrRenderTarget* rt = dc->accessRenderTarget();
int w = rect.width();
int h = rect.height();
SkAutoTDeleteArray<uint32_t> pixels(new uint32_t[w * h]);
memset(pixels.get(), ~expectedValue, sizeof(uint32_t) * w * h);
rt->readPixels(rect.fLeft, rect.fTop, w, h, kRGBA_8888_GrPixelConfig, pixels.get());
for (int y = 0; y < h; ++y) {
for (int x = 0; x < w; ++x) {
uint32_t pixel = pixels.get()[y * w + x];
if (pixel != expectedValue) {
*actualValue = pixel;
*failX = x + rect.fLeft;
*failY = y + rect.fTop;
return false;
}
}
}
return true;
}
