From 94f206c1c75eb8cc4df2225a1c5c9c7b6fc96679 Mon Sep 17 00:00:00 2001
From: "jamesr@chromium.org"
<jamesr@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98>
Date: Sat, 25 Aug 2012 00:09:14 +0000
Subject: Here are gyp targets and stubs for compiling libcc and the
webkit_compositor bindings in chromium. Everything is guarded behind the
off-by-default use_libcc_for_compositor gyp variable. I haven't included the
actual code here, but there are scripts to sync. I plan to land + manually
sync the code into place until we're ready to flip the gyp switch.
Snapshot from r126652
BUG=
Review URL: https://chromiumcodereview.appspot.com/10828381
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@153354 0039d316-1c4b-4281-b951-d872f2087c98
---
cc/LayerTextureSubImage.cpp | 109 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 109 insertions(+)
create mode 100644 cc/LayerTextureSubImage.cpp
(limited to 'cc/LayerTextureSubImage.cpp')
diff --git a/cc/LayerTextureSubImage.cpp b/cc/LayerTextureSubImage.cpp
new file mode 100644
index 0000000..f555fa1
--- /dev/null
+++ b/cc/LayerTextureSubImage.cpp
@@ -0,0 +1,109 @@
+// Copyright 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+
+#if USE(ACCELERATED_COMPOSITING)
+
+#include "LayerTextureSubImage.h"
+
+#include "CCRendererGL.h" // For the GLC() macro.
+#include "Extensions3DChromium.h"
+#include "TraceEvent.h"
+#include <public/WebGraphicsContext3D.h>
+
+using WebKit::WebGraphicsContext3D;
+
+namespace WebCore {
+
+LayerTextureSubImage::LayerTextureSubImage(bool useMapTexSubImage)
+ : m_useMapTexSubImage(useMapTexSubImage)
+ , m_subImageSize(0)
+{
+}
+
+LayerTextureSubImage::~LayerTextureSubImage()
+{
+}
+
+void LayerTextureSubImage::upload(const uint8_t* image, const IntRect& imageRect,
+ const IntRect& sourceRect, const IntSize& destOffset,
+ GC3Denum format, WebGraphicsContext3D* context)
+{
+ if (m_useMapTexSubImage)
+ uploadWithMapTexSubImage(image, imageRect, sourceRect, destOffset, format, context);
+ else
+ uploadWithTexSubImage(image, imageRect, sourceRect, destOffset, format, context);
+}
+
+void LayerTextureSubImage::uploadWithTexSubImage(const uint8_t* image, const IntRect& imageRect,
+ const IntRect& sourceRect, const IntSize& destOffset,
+ GC3Denum format, WebGraphicsContext3D* context)
+{
+ TRACE_EVENT0("cc", "LayerTextureSubImage::uploadWithTexSubImage");
+
+ // Offset from image-rect to source-rect.
+ IntPoint offset(sourceRect.x() - imageRect.x(), sourceRect.y() - imageRect.y());
+
+ const uint8_t* pixelSource;
+ if (imageRect.width() == sourceRect.width() && !offset.x())
+ pixelSource = &image[4 * offset.y() * imageRect.width()];
+ else {
+ size_t neededSize = 4 * sourceRect.width() * sourceRect.height();
+ if (m_subImageSize < neededSize) {
+ m_subImage = adoptArrayPtr(new uint8_t[neededSize]);
+ m_subImageSize = neededSize;
+ }
+ // Strides not equal, so do a row-by-row memcpy from the
+ // paint results into a temp buffer for uploading.
+ for (int row = 0; row < sourceRect.height(); ++row)
+ memcpy(&m_subImage[sourceRect.width() * 4 * row],
+ &image[4 * (offset.x() + (offset.y() + row) * imageRect.width())],
+ sourceRect.width() * 4);
+
+ pixelSource = &m_subImage[0];
+ }
+
+ GLC(context, context->texSubImage2D(GraphicsContext3D::TEXTURE_2D, 0, destOffset.width(), destOffset.height(), sourceRect.width(), sourceRect.height(), format, GraphicsContext3D::UNSIGNED_BYTE, pixelSource));
+}
+
+void LayerTextureSubImage::uploadWithMapTexSubImage(const uint8_t* image, const IntRect& imageRect,
+ const IntRect& sourceRect, const IntSize& destOffset,
+ GC3Denum format, WebGraphicsContext3D* context)
+{
+ TRACE_EVENT0("cc", "LayerTextureSubImage::uploadWithMapTexSubImage");
+ // Offset from image-rect to source-rect.
+ IntPoint offset(sourceRect.x() - imageRect.x(), sourceRect.y() - imageRect.y());
+
+ // Upload tile data via a mapped transfer buffer
+ uint8_t* pixelDest = static_cast<uint8_t*>(context->mapTexSubImage2DCHROMIUM(GraphicsContext3D::TEXTURE_2D, 0, destOffset.width(), destOffset.height(), sourceRect.width(), sourceRect.height(), format, GraphicsContext3D::UNSIGNED_BYTE, Extensions3DChromium::WRITE_ONLY));
+
+ if (!pixelDest) {
+ uploadWithTexSubImage(image, imageRect, sourceRect, destOffset, format, context);
+ return;
+ }
+
+ unsigned int componentsPerPixel;
+ unsigned int bytesPerComponent;
+ if (!GraphicsContext3D::computeFormatAndTypeParameters(format, GraphicsContext3D::UNSIGNED_BYTE, &componentsPerPixel, &bytesPerComponent)) {
+ ASSERT_NOT_REACHED();
+ return;
+ }
+
+ if (imageRect.width() == sourceRect.width() && !offset.x())
+ memcpy(pixelDest, &image[offset.y() * imageRect.width() * componentsPerPixel * bytesPerComponent], imageRect.width() * sourceRect.height() * componentsPerPixel * bytesPerComponent);
+ else {
+ // Strides not equal, so do a row-by-row memcpy from the
+ // paint results into the pixelDest
+ for (int row = 0; row < sourceRect.height(); ++row)
+ memcpy(&pixelDest[sourceRect.width() * row * componentsPerPixel * bytesPerComponent],
+ &image[4 * (offset.x() + (offset.y() + row) * imageRect.width())],
+ sourceRect.width() * componentsPerPixel * bytesPerComponent);
+ }
+ GLC(context, context->unmapTexSubImage2DCHROMIUM(pixelDest));
+}
+
+} // namespace WebCore
+
+#endif // USE(ACCELERATED_COMPOSITING)
--
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