some additional status information

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@11101 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/servers/app/server/Painter/NOTES

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+Some weirdness encountered so far:
+
+B_OP_INVERT seems to invert the dest alpha as well,
+some other modes act weird on the dest alpha channel, I guess we should not copy that behaviour
+
+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.
+
+B_OP_ALPHA (with B_ALPHA_OVERLAY) seems to *assign* the source alpha to the dest alpha, which makes absolutely no sense at all
+
+The BView pen location appears to be integer coords, which spoils the pen location version of BView::DrawString() for rotated text.
+
+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.

src/servers/app/server/Painter/TODO

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+Test:
+
+* "composite" alpha blending modes
+
+* BShape conversion and rendering
+
+* Bezier curve rendering
+
+
+
+Implement:
+
+* "escapment_delta" text rendering
+
+* font shearing
+
+* handling of other BBitmap colorspaces
+
+
+
+Improve:
+
+* make special case versions of some functions:
+
+- horizontal/vertical lines
+- horizonzal text rendering, using scanline cache
+
+* make special verions of DrawingModes for B_SOLID_* patterns
+
+* get rid of virtual function use in DrawingMode framework
+