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b=415285, win32 plugin printed is overprinted ; r=stuart

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vladimir@pobox.com 2008-02-13 22:27:51 -08:00
parent 658f5a6467
commit 2f94d8d7c7
1 changed files with 55 additions and 1 deletions
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56
layout/generic/nsObjectFrame.cpp
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@ -126,6 +126,10 @@
#include "gfxContext.h"
#ifdef XP_WIN
#include "gfxWindowsNativeDrawing.h"
#endif
// accessibility support
#ifdef ACCESSIBILITY
#include "nsIAccessibilityService.h"
@ -1168,10 +1172,60 @@ nsObjectFrame::PrintPlugin(nsIRenderingContext& aRenderingContext,
PR_LOG(nsObjectFrameLM, PR_LOG_DEBUG, ("plugin printing done, return code is %lx\n", (long)rv));
#elif defined(XP_WIN)
/* On Windows, we use the win32 printing surface to print. This, in
* turn, uses the Cairo paginated surface, which in turn uses the
* meta surface to record all operations and then play them back.
* This doesn't work too well for plugins, because if plugins render
* directly into the DC, the meta surface won't have any knowledge
* of them, and so at the end when it actually does the replay step,
* it'll fill the background with white and draw over whatever was
* rendered before.
*
* So, to avoid this, we use PushGroup, which creates a new windows
* surface, the plugin renders to that, and then we use normal
* cairo methods to composite that in such that it's recorded using the
* meta surface.
*/
gfxContext *ctx = aRenderingContext.ThebesContext();
ctx->Save();
ctx->NewPath();
ctx->Rectangle(gfxRect(window.x, window.y,
window.width, window.height));
ctx->Clip();
ctx->PushGroup(gfxASurface::CONTENT_COLOR_ALPHA);
gfxWindowsNativeDrawing nativeDraw(ctx,
gfxRect(window.x, window.y,
window.width, window.height));
do {
HDC dc = nativeDraw.BeginNativeDrawing();
if (!dc)
return;
npprint.print.embedPrint.platformPrint = dc;
npprint.print.embedPrint.window = window;
// send off print info to plugin
rv = pi->Print(&npprint);
nativeDraw.EndNativeDrawing();
} while (nativeDraw.ShouldRenderAgain());
nativeDraw.PaintToContext();
ctx->PopGroupToSource();
ctx->Paint();
ctx->Restore();
#else
// we need the native printer device context to pass to plugin
// On Windows, this will be the HDC
// NATIVE_WINDOWS_DC is a misnomer, it's whatever the native platform
// thing is.
void* dc;
dc = aRenderingContext.GetNativeGraphicData(nsIRenderingContext::NATIVE_WINDOWS_DC);
if (!dc)