Merge webkit.org at r55033 : Initial merge by git

Change-Id: I98a4af828067cc243ec3dc5e5826154dd88074b5

1 files changed, 130 insertions, 0 deletions

diff --git a/WebCore/platform/graphics/GraphicsContext3D.cpp b/WebCore/platform/graphics/GraphicsContext3D.cpp
new file mode 100644
index 0000000..3eb9818
--- /dev/null
+++ b/WebCore/platform/graphics/GraphicsContext3D.cpp
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2010 Apple Inc. All rights reserved.
+ * Copyright (C) 2010 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+
+#if ENABLE(3D_CANVAS)
+
+#include "GraphicsContext3D.h"
+
+#include "Image.h"
+
+namespace WebCore {
+
+bool GraphicsContext3D::extractImageData(Image* image,
+                                         bool flipY,
+                                         bool premultiplyAlpha,
+                                         Vector<uint8_t>& imageData,
+                                         unsigned int* format,
+                                         unsigned int* internalFormat)
+{
+    if (!image)
+        return false;
+    AlphaOp alphaOp = kAlphaDoNothing;
+    bool hasAlphaChannel = true;
+    if (!getImageData(image, imageData, premultiplyAlpha,
+                      &hasAlphaChannel, &alphaOp, format))
+        return false;
+    processImageData(imageData.data(),
+                     image->width(),
+                     image->height(),
+                     flipY,
+                     alphaOp);
+    *internalFormat = (hasAlphaChannel ? RGBA : RGB);
+    return true;
+}
+
+void GraphicsContext3D::processImageData(uint8_t* imageData,
+                                         unsigned width,
+                                         unsigned height,
+                                         bool flipVertically,
+                                         AlphaOp alphaOp)
+{
+    switch (alphaOp) {
+    case kAlphaDoPremultiply:
+        premultiplyAlpha(imageData, width * height);
+        break;
+    case kAlphaDoUnmultiply:
+        unmultiplyAlpha(imageData, width * height);
+        break;
+    default:
+        break;
+    }
+
+    if (flipVertically && width && height) {
+        int rowBytes = width * 4;
+        uint8_t* tempRow = new uint8_t[rowBytes];
+        for (unsigned i = 0; i < height / 2; i++) {
+            uint8_t* lowRow = imageData + (rowBytes * i);
+            uint8_t* highRow = imageData + (rowBytes * (height - i - 1));
+            memcpy(tempRow, lowRow, rowBytes);
+            memcpy(lowRow, highRow, rowBytes);
+            memcpy(highRow, tempRow, rowBytes);
+        }
+        delete[] tempRow;
+    }
+}
+
+// Premultiply alpha into color channels.
+void GraphicsContext3D::premultiplyAlpha(unsigned char* rgbaData, int numPixels)
+{
+    for (int j = 0; j < numPixels; j++) {
+        float r = rgbaData[4*j+0] / 255.0f;
+        float g = rgbaData[4*j+1] / 255.0f;
+        float b = rgbaData[4*j+2] / 255.0f;
+        float a = rgbaData[4*j+3] / 255.0f;
+        rgbaData[4*j+0] = (unsigned char) (r * a * 255.0f);
+        rgbaData[4*j+1] = (unsigned char) (g * a * 255.0f);
+        rgbaData[4*j+2] = (unsigned char) (b * a * 255.0f);
+    }
+}
+
+// Remove premultiplied alpha from color channels.
+// FIXME: this is lossy. Must retrieve original values from HTMLImageElement.
+void GraphicsContext3D::unmultiplyAlpha(unsigned char* rgbaData, int numPixels)
+{
+    for (int j = 0; j < numPixels; j++) {
+        float r = rgbaData[4*j+0] / 255.0f;
+        float g = rgbaData[4*j+1] / 255.0f;
+        float b = rgbaData[4*j+2] / 255.0f;
+        float a = rgbaData[4*j+3] / 255.0f;
+        if (a > 0.0f) {
+            r /= a;
+            g /= a;
+            b /= a;
+            r = (r > 1.0f) ? 1.0f : r;
+            g = (g > 1.0f) ? 1.0f : g;
+            b = (b > 1.0f) ? 1.0f : b;
+            rgbaData[4*j+0] = (unsigned char) (r * 255.0f);
+            rgbaData[4*j+1] = (unsigned char) (g * 255.0f);
+            rgbaData[4*j+2] = (unsigned char) (b * 255.0f);
+        }
+    }
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(3D_CANVAS)