I'm currently working on enabling full alpha channel support in IBrowse 2.5 for when it is running on MorphOS (well, using CGX V51 as a test to enable it), without a working MorphOS system, and am wondering if anybody can give clarification on the following as I seem to recall there were some discrepancies in CyberGraphX when it came to 24 vs 32-bit depths?
1. For 24-bit bitmaps with an alpha channel, what do BMA_DEPTH and CYBRMATTR_DEPTH return - 24 or 32? Presumably, CYBRMATTR_BPPIX returns 4 (or 3 if there is no alpha). I need a way to detect if a bitmap allocated using a friend bitmap is alpha capable.
2. When using AllocBitMap() to allocated a 24-bit bitmap with alpha, presumably I just need to specify the depth as 32?
3. For 32-bit datatype images, I will be using PDTM_READPIXELARRAY with PBPAFMT_RGBA and writing it into a bitmap with WritePixelArray() RECTFMT_RGBA. Or do I need to use WritePixelArrayAlpha()?
4. When rendering a bitmap with alpha, can I still use BltBitMap[RastPort]() or do I need to use the new BltBitMap*Alpha() equivalent functions in CGX?
I couldn't find any documentation that answered these queries, so hoping somebody more knowledgable can help me [ Edited by Futaura 18.09.2019 - 10:36 ]