some additional status information
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@11101 a95241bf-73f2-0310-859d-f6bbb57e9c96
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Some weirdness encountered so far:
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B_OP_INVERT seems to invert the dest alpha as well,
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some other modes act weird on the dest alpha channel, I guess we should not copy that behaviour
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B_OP_SELECT is originally behaving very strange. For BBitmp drawing, it doesn't seem to do anything, and if it does something for Stroke* and Fill* methods, it doesn't do what the BeBook says it would do. My implementation is more according to the BeBook, though for images, it is worth investigating.
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B_OP_ALPHA (with B_ALPHA_OVERLAY) seems to *assign* the source alpha to the dest alpha, which makes absolutely no sense at all
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The BView pen location appears to be integer coords, which spoils the pen location version of BView::DrawString() for rotated text.
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Dest alpha is actually only interesting when drawing into a BBitmap. When drawing into the frame buffer, dest alpha is logically 255, it wouldn't even need to be assigned. Maybe we could save a few CPU cycles if we adjust the DrawingMode classes accordingly. For now, the modes work as expected when drawing into a BBitmap.
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Test:
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* "composite" alpha blending modes
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* BShape conversion and rendering
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* Bezier curve rendering
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Implement:
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* "escapment_delta" text rendering
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* font shearing
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* handling of other BBitmap colorspaces
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Improve:
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* make special case versions of some functions:
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- horizontal/vertical lines
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- horizonzal text rendering, using scanline cache
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* make special verions of DrawingModes for B_SOLID_* patterns
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* get rid of virtual function use in DrawingMode framework
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