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Bug 603885, part 5: Move the code for getting a gfxContext for a quadrant update into its own method. r=roc

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This commit is contained in:
Chris Jones
2010-11-05 02:17:07 -05:00
parent 183a42f92e
commit cc7dba2516
2 changed files with 30 additions and 11 deletions
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33
gfx/layers/ThebesLayerBuffer.cpp
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@@ -148,6 +148,26 @@ ThebesLayerBuffer::DrawBufferWithRotation(gfxContext* aTarget, float aOpacity,
DrawBufferQuadrant(aTarget, RIGHT, BOTTOM, aOpacity, aXRes, aYRes);
}
already_AddRefed<gfxContext>
ThebesLayerBuffer::GetContextForQuadrantUpdate(const nsIntRect& aBounds,
float aXResolution,
float aYResolution)
{
nsRefPtr<gfxContext> ctx = new gfxContext(mBuffer);
// Figure out which quadrant to draw in
PRInt32 xBoundary = mBufferRect.XMost() - mBufferRotation.x;
PRInt32 yBoundary = mBufferRect.YMost() - mBufferRotation.y;
XSide sideX = aBounds.XMost() <= xBoundary ? RIGHT : LEFT;
YSide sideY = aBounds.YMost() <= yBoundary ? BOTTOM : TOP;
nsIntRect quadrantRect = GetQuadrantRectangle(sideX, sideY);
NS_ASSERTION(quadrantRect.Contains(aBounds), "Messed up quadrants");
ctx->Scale(aXResolution, aYResolution);
ctx->Translate(-gfxPoint(quadrantRect.x, quadrantRect.y));
return ctx.forget();
}
static void
WrapRotationAxis(PRInt32* aRotationPoint, PRInt32 aSize)
{
@@ -290,17 +310,8 @@ ThebesLayerBuffer::BeginPaint(ThebesLayer* aLayer, ContentType aContentType,
invalidate.Sub(aLayer->GetValidRegion(), destBufferRect);
result.mRegionToInvalidate.Or(result.mRegionToInvalidate, invalidate);
result.mContext = new gfxContext(mBuffer);
// Figure out which quadrant to draw in
PRInt32 xBoundary = mBufferRect.XMost() - mBufferRotation.x;
PRInt32 yBoundary = mBufferRect.YMost() - mBufferRotation.y;
XSide sideX = drawBounds.XMost() <= xBoundary ? RIGHT : LEFT;
YSide sideY = drawBounds.YMost() <= yBoundary ? BOTTOM : TOP;
nsIntRect quadrantRect = GetQuadrantRectangle(sideX, sideY);
NS_ASSERTION(quadrantRect.Contains(drawBounds), "Messed up quadrants");
result.mContext->Scale(aXResolution, aYResolution);
result.mContext->Translate(-gfxPoint(quadrantRect.x, quadrantRect.y));
result.mContext = GetContextForQuadrantUpdate(drawBounds,
aXResolution, aYResolution);
gfxUtils::ClipToRegion(result.mContext, result.mRegionToDraw);
if (aContentType == gfxASurface::CONTENT_COLOR_ALPHA && !isClear) {