Hyperion Entertainment Message Boards

Supplying a friend bitmap or display ID is indeed the only way to force the bitmap to be allocated in VRAM.
I pass Screen->RastPort.BitMap as friend to AllocBitMap().

BMF_DISPLAYABLE to specify that this bitmap data should be allocated in such a manner that it can be displayed.
In fact this ...

PDTM_READPIXELARRAY did the trick. I allocate temporary buffer of size witdh * height * 4. Then I do READPIXELARRAY into it, requesting ARGB format. Then I allocate a bitmap (being screen's bitmap friend) of the same size, depth 32 and blit data to it using BltBitMapTags(). Then I destroy both ...

Are you supplying BLITA_UseSrcAlpha, TRUE to your BltBitMapTags call?
Of course I do. I have read the autodoc of it carefully.


BltBitMapTags(
BLITA_Source, ggfx->Bricks,
BLITA_SrcType, BLITT_BITMAP,
BLITA_SrcX, src_x,
BLITA_SrcY, src_y,
BLITA_Dest, win->RPort,
BLITA_DestType, BLITT ...

Hum, my Os3.x code was really quite the same as the code I showed you,
And it worked with OCS/ECS/AGA? I support them too, just in this case the graphics is 4-color IFF ILBM, of course without any alpha.

Unfortunatelly, I can hardly turn on my 4000T. Are you sure also your PNG datatype support ...

I see both of you use PDTM_READPIXELARRAY method. As my code is based on AmigaOS 3.x one, it works differently. After setting PDTA_Mode to v43 (which is the default anyway, as stated it the autodoc), I perform DTM_PROCLAYOUT and then query PDTA_DestBitmap. Finally I allocate my buffer bitmap with ...

I want to load a PNG image with its alpha channel and then blit fragments of this image into window RastPort using BltBitMapTags(). So far I'm unsuccesfull, images are blitted, but without alpha. The first problem is that PDTA_Depth returns me 24 (instead of 32). Do I need some special tag for ...