Add OpenGL context to Viewer.
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1978573003
Committed: https://skia.googlesource.com/skia/+/56a11e4d6f3d436a3c2497c9c9e71a117d78a93f
Review-Url: https://codereview.chromium.org/1978573003
diff --git a/tools/viewer/sk_app/WindowContext.cpp b/tools/viewer/sk_app/WindowContext.cpp
new file mode 100755
index 0000000..41bbd14
--- /dev/null
+++ b/tools/viewer/sk_app/WindowContext.cpp
@@ -0,0 +1,74 @@
+
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrContext.h"
+#include "SkSurface.h"
+#include "WindowContext.h"
+
+#include "gl/GrGLDefines.h"
+
+#include "gl/GrGLUtil.h"
+#include "GrRenderTarget.h"
+#include "GrContext.h"
+
+#include "SkCanvas.h"
+#include "SkImage_Base.h"
+
+namespace sk_app {
+
+sk_sp<SkSurface> WindowContext::createRenderSurface(sk_sp<GrRenderTarget> rt, int colorBits) {
+ auto flags = (fSurfaceProps.flags() & ~SkSurfaceProps::kGammaCorrect_Flag) |
+ (GrPixelConfigIsSRGB(fPixelConfig) ? SkSurfaceProps::kGammaCorrect_Flag : 0);
+ SkSurfaceProps props(flags, fSurfaceProps.pixelGeometry());
+
+ if (!this->isGpuContext() || colorBits > 24 ||
+ kRGBA_F16_SkColorType == fDisplayParams.fColorType) {
+ // If we're rendering to F16, we need an off-screen surface - the current render
+ // target is most likely the wrong format.
+ //
+ // If we're rendering raster data or using a deep (10-bit or higher) surface, we probably
+ // need an off-screen surface. 10-bit, in particular, has strange gamma behavior.
+ SkImageInfo info = SkImageInfo::Make(fWidth, fHeight,
+ fDisplayParams.fColorType,
+ kUnknown_SkAlphaType,
+ fDisplayParams.fProfileType);
+ return SkSurface::MakeRenderTarget(fContext, SkBudgeted::kNo, info,
+ fDisplayParams.fMSAASampleCount, &props);
+ } else {
+ return SkSurface::MakeRenderTargetDirect(rt.get(), &props);
+ }
+}
+
+void WindowContext::presentRenderSurface(sk_sp<SkSurface> renderSurface, sk_sp<GrRenderTarget> rt,
+ int colorBits) {
+ if (!this->isGpuContext() || colorBits > 24 ||
+ kRGBA_F16_SkColorType == fDisplayParams.fColorType) {
+ // We made/have an off-screen surface. Get the contents as an SkImage:
+ SkImageInfo info = SkImageInfo::Make(fWidth, fHeight,
+ fDisplayParams.fColorType,
+ kUnknown_SkAlphaType,
+ fDisplayParams.fProfileType);
+ SkBitmap bm;
+ bm.allocPixels(info);
+ renderSurface->getCanvas()->readPixels(&bm, 0, 0);
+ SkPixmap pm;
+ bm.peekPixels(&pm);
+ sk_sp<SkImage> image(SkImage::MakeTextureFromPixmap(fContext, pm,
+ SkBudgeted::kNo));
+ GrTexture* texture = as_IB(image)->peekTexture();
+ SkASSERT(texture);
+
+ // With ten-bit output, we need to manually apply the gamma of the output device
+ // (unless we're in non-gamma correct mode, in which case our data is already
+ // fake-sRGB, like we're expected to put in the 10-bit buffer):
+ bool doGamma = (colorBits == 30) && SkImageInfoIsGammaCorrect(info);
+ fContext->applyGamma(rt.get(), texture, doGamma ? 1.0f / 2.2f : 1.0f);
+ }
+}
+
+} //namespace sk_app