Add perspective support to GrTextureOp.
Bug: skia:
Change-Id: Idea4ffae37dc2c2f339af60a2b74ded476091758
Reviewed-on: https://skia-review.googlesource.com/127600
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/gm/perspimages.cpp b/gm/perspimages.cpp
new file mode 100644
index 0000000..a4242cf
--- /dev/null
+++ b/gm/perspimages.cpp
@@ -0,0 +1,111 @@
+/*
+ * Copyright 2018 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 "Resources.h"
+#include "SkGradientShader.h"
+#include "SkImage.h"
+#include "SkPath.h"
+#include "SkSurface.h"
+#include "sk_tool_utils.h"
+
+static sk_sp<SkImage> make_image1() { return GetResourceAsImage("images/mandrill_128.png"); }
+
+static sk_sp<SkImage> make_image2() {
+ return GetResourceAsImage("images/brickwork-texture.jpg")->makeSubset({0, 0, 128, 128});
+}
+
+namespace skiagm {
+
+class PerspImages : public GM {
+public:
+ PerspImages() = default;
+
+protected:
+ SkString onShortName() override { return SkString("persp_images"); }
+
+ SkISize onISize() override { return SkISize::Make(1150, 880); }
+
+ void onOnceBeforeDraw() override {
+ fImages.push_back(make_image1());
+ fImages.push_back(make_image2());
+ }
+
+ void onDraw(SkCanvas* canvas) override {
+ SkTDArray<SkMatrix> matrices;
+ matrices.push()->setAll(1.f, 0.f, 0.f,
+ 0.f, 1.f, 0.f,
+ 0.f, 0.005f, 1.f);
+ matrices.push()->setAll(1.f, 0.f, 0.f,
+ 0.f, 1.f, 0.f,
+ 0.007f, -0.005f, 1.f);
+ matrices[1].preSkew(0.2f, -0.1f);
+ matrices[1].preRotate(-65.f);
+ matrices[1].preScale(1.2f, .8f);
+ matrices[1].postTranslate(0.f, 60.f);
+ SkPaint paint;
+ int n = 0;
+ SkRect bounds = SkRect::MakeEmpty();
+ for (const auto& img : fImages) {
+ SkRect imgB = SkRect::MakeWH(img->width(), img->height());
+ for (const auto& m : matrices) {
+ SkRect temp;
+ m.mapRect(&temp, imgB);
+ bounds.join(temp);
+ }
+ }
+ canvas->translate(-bounds.fLeft + 10.f, -bounds.fTop + 10.f);
+ canvas->save();
+ for (auto subrect : {false, true}) {
+ for (const auto& m : matrices) {
+ for (auto aa : {false, true}) {
+ paint.setAntiAlias(aa);
+ for (auto filter : {kNone_SkFilterQuality, kLow_SkFilterQuality,
+ kMedium_SkFilterQuality, kHigh_SkFilterQuality}) {
+ for (const auto& img : fImages) {
+ paint.setFilterQuality(filter);
+ canvas->save();
+ canvas->concat(m);
+ if (subrect) {
+ SkRect src = {img->width() / 4.f, img->height() / 4.f,
+ 3.f * img->width() / 4.f, 3.f * img->height() / 4};
+ SkRect dst = {0, 0,
+ 3.f / 4.f * img->width(), 3.f / 4.f * img->height()};
+ canvas->drawImageRect(img, src, dst, &paint);
+ } else {
+ canvas->drawImage(img, 0, 0, &paint);
+ }
+ canvas->restore();
+ ++n;
+ if (n < 8) {
+ canvas->translate(bounds.width() + 10.f, 0);
+ } else {
+ canvas->restore();
+ canvas->translate(0, bounds.height() + 10.f);
+ canvas->save();
+ n = 0;
+ }
+ }
+ }
+ }
+ }
+ }
+ canvas->restore();
+ }
+
+private:
+ static constexpr int kNumImages = 4;
+ SkTArray<sk_sp<SkImage>> fImages;
+
+ typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+DEF_GM(return new PerspImages();)
+
+} // namespace skiagm