Add imagemasksubset GM
(GM for non-N32 SkImage subsetting)
BUG=skia:5687
R=bsalomon@google.com,robertphillips@google.com,reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2286733002
Review-Url: https://codereview.chromium.org/2286733002
diff --git a/gm/imagemasksubset.cpp b/gm/imagemasksubset.cpp
new file mode 100644
index 0000000..80e63f6
--- /dev/null
+++ b/gm/imagemasksubset.cpp
@@ -0,0 +1,84 @@
+/*
+ * Copyright 2016 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 "SkCanvas.h"
+#include "SkImage.h"
+#include "SkImageGenerator.h"
+#include "SkSurface.h"
+#include "sk_tool_utils.h"
+
+namespace {
+
+const SkISize kSize = SkISize::Make(100, 100);
+const SkIRect kSubset = SkIRect::MakeLTRB(25, 25, 75, 75);
+const SkRect kDest = SkRect::MakeXYWH(10, 10, 100, 100);
+
+sk_sp<SkImage> make_mask(const sk_sp<SkSurface>& surface) {
+ sk_tool_utils::draw_checkerboard(surface->getCanvas(), 0x80808080, 0x00000000, 5);
+ return surface->makeImageSnapshot();
+}
+
+class MaskGenerator final : public SkImageGenerator {
+public:
+ MaskGenerator(const SkImageInfo& info) : INHERITED(info) {}
+
+ bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes, SkPMColor*,
+ int*) override {
+ if (info.colorType() == kIndex_8_SkColorType) {
+ return false;
+ }
+
+ make_mask(SkSurface::MakeRasterDirect(info, pixels, rowBytes));
+ return true;
+ }
+
+private:
+ typedef SkImageGenerator INHERITED;
+};
+
+using MakerT = sk_sp<SkImage>(*)(SkCanvas*, const SkImageInfo&);
+const MakerT makers[] = {
+ // SkImage_Raster
+ [](SkCanvas*, const SkImageInfo& info) -> sk_sp<SkImage> {
+ return make_mask(SkSurface::MakeRaster(info));
+ },
+
+ // SkImage_Gpu
+ [](SkCanvas* c, const SkImageInfo& info) -> sk_sp<SkImage> {
+ sk_sp<SkSurface> surface;
+#if SK_SUPPORT_GPU
+ surface = SkSurface::MakeRenderTarget(c->getGrContext(), SkBudgeted::kNo, info);
+#endif
+ return make_mask(surface ? surface : SkSurface::MakeRaster(info));
+ },
+
+ // SkImage_Generator
+ [](SkCanvas*, const SkImageInfo& info) -> sk_sp<SkImage> {
+ return SkImage::MakeFromGenerator(new MaskGenerator(info));
+ },
+};
+
+} // anonymous ns
+
+// Checks whether subset SkImages preserve the original color type (A8 in this case).
+DEF_SIMPLE_GM(imagemasksubset, canvas, 480, 480) {
+ SkPaint paint;
+ paint.setColor(0xff00ff00);
+
+ const SkImageInfo info = SkImageInfo::MakeA8(kSize.width(), kSize.height());
+
+ for (size_t i = 0; i < SK_ARRAY_COUNT(makers); ++i) {
+ sk_sp<SkImage> image = makers[i](canvas, info);
+ if (image) {
+ canvas->drawImageRect(image, SkRect::Make(kSubset), kDest, &paint);
+ sk_sp<SkImage> subset = image->makeSubset(kSubset);
+ canvas->drawImageRect(subset, kDest.makeOffset(kSize.width() * 1.5f, 0), &paint);
+ }
+ canvas->translate(0, kSize.height() * 1.5f);
+ }
+}