external/webkit r30707

1 files changed, 166 insertions, 0 deletions

diff --git a/WebCore/platform/win/DragImageCGWin.cpp b/WebCore/platform/win/DragImageCGWin.cpp
new file mode 100644
index 0000000..7788572
--- /dev/null
+++ b/WebCore/platform/win/DragImageCGWin.cpp
@@ -0,0 +1,166 @@
+/*
+ * Copyright (C) 2007, 2008 Apple 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"
+#include "DragImage.h"
+
+#include "CachedImage.h"
+#include "GraphicsContext.h"
+#include "Image.h"
+#include "RetainPtr.h"
+
+#include <CoreGraphics/CoreGraphics.h>
+
+#include <windows.h>
+
+namespace WebCore {
+
+HBITMAP allocImage(HDC dc, IntSize size, CGContextRef *targetRef)
+{
+    HBITMAP hbmp;
+    BITMAPINFO bmpInfo = {0};
+    bmpInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
+    bmpInfo.bmiHeader.biWidth = size.width();
+    bmpInfo.bmiHeader.biHeight = size.height();
+    bmpInfo.bmiHeader.biPlanes = 1;
+    bmpInfo.bmiHeader.biBitCount = 32;
+    bmpInfo.bmiHeader.biCompression = BI_RGB;
+    LPVOID bits;
+    hbmp = CreateDIBSection(dc, &bmpInfo, DIB_RGB_COLORS, &bits, 0, 0);
+
+    if (!targetRef)
+        return hbmp;
+
+    CGColorSpaceRef deviceRGB = CGColorSpaceCreateDeviceRGB();
+    CGContextRef bitmapContext = CGBitmapContextCreate(bits, bmpInfo.bmiHeader.biWidth, bmpInfo.bmiHeader.biHeight, 8,
+                                                       bmpInfo.bmiHeader.biWidth * 4, deviceRGB, 
+                                                       kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipFirst);
+    CGColorSpaceRelease(deviceRGB);
+    if (!bitmapContext) {
+        DeleteObject(hbmp);
+        return 0;
+    }
+
+    *targetRef = bitmapContext;
+    return hbmp;
+}
+
+static CGContextRef createCgContextFromBitmap(HBITMAP bitmap)
+{
+    BITMAP info;
+    GetObject(bitmap, sizeof(info), &info);
+    ASSERT(info.bmBitsPixel == 32);
+
+    CGColorSpaceRef deviceRGB = CGColorSpaceCreateDeviceRGB();
+    CGContextRef bitmapContext = CGBitmapContextCreate(info.bmBits, info.bmWidth, info.bmHeight, 8,
+                                                       info.bmWidthBytes, deviceRGB, kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipFirst);
+    CGColorSpaceRelease(deviceRGB);
+    return bitmapContext;
+}
+
+DragImageRef scaleDragImage(DragImageRef image, FloatSize scale)
+{
+    // FIXME: due to the way drag images are done on windows we need 
+    // to preprocess the alpha channel <rdar://problem/5015946>
+
+    if (!image)
+        return 0;
+    CGContextRef targetContext;
+    CGContextRef srcContext;
+    CGImageRef srcImage;
+    IntSize srcSize = dragImageSize(image);
+    IntSize dstSize(static_cast<int>(srcSize.width() * scale.width()), static_cast<int>(srcSize.height() * scale.height()));
+    HBITMAP hbmp = 0;
+    HDC dc = GetDC(0);
+    HDC dstDC = CreateCompatibleDC(dc);
+    if (!dstDC)
+        goto exit;
+
+    hbmp = allocImage(dstDC, dstSize, &targetContext);
+    if (!hbmp)
+        goto exit;
+
+    srcContext = createCgContextFromBitmap(image);
+    srcImage = CGBitmapContextCreateImage(srcContext);
+    CGRect rect;
+    rect.origin.x = 0;
+    rect.origin.y = 0;
+    rect.size = dstSize;
+    CGContextDrawImage(targetContext, rect, srcImage);
+    CGImageRelease(srcImage);
+    CGContextRelease(srcContext);
+    CGContextRelease(targetContext);
+    ::DeleteObject(image);
+    image = 0;
+
+exit:
+    if (!hbmp)
+        hbmp = image;
+    if (dstDC)
+        DeleteDC(dstDC);
+    ReleaseDC(0, dc);
+    return hbmp;
+}
+    
+DragImageRef createDragImageFromImage(Image* img)
+{
+    HBITMAP hbmp = 0;
+    HDC dc = GetDC(0);
+    HDC workingDC = CreateCompatibleDC(dc);
+    CGContextRef drawContext = 0;
+    if (!workingDC)
+        goto exit;
+
+    hbmp = allocImage(workingDC, img->size(), &drawContext);
+
+    if (!hbmp)
+        goto exit;
+
+    if (!drawContext) {
+        ::DeleteObject(hbmp);
+        hbmp = 0;
+    }
+
+    CGImageRef srcImage = img->getCGImageRef();
+    CGRect rect;
+    rect.size = img->size();
+    rect.origin.x = 0;
+    rect.origin.y = -rect.size.height;
+    static const CGFloat white [] = {1.0, 1.0, 1.0, 1.0};
+    CGContextScaleCTM(drawContext, 1, -1);
+    CGContextSetFillColor(drawContext, white);
+    CGContextFillRect(drawContext, rect);
+    CGContextSetBlendMode(drawContext, kCGBlendModeNormal);
+    CGContextDrawImage(drawContext, rect, srcImage);
+    CGContextRelease(drawContext);
+
+exit:
+    if (workingDC)
+        DeleteDC(workingDC);
+    ReleaseDC(0, dc);
+    return hbmp;
+}
+    
+}