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Custom apha-supporting backfill hook for tiled bitmaps that require it.

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svn path=/trunk/netsurf/; revision=7553
This commit is contained in:
Chris Young 2009-05-26 22:39:23 +00:00
parent 772bbec9e8
commit 0e880815f7
1 changed files with 70 additions and 2 deletions
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72
amiga/plotters.c
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@ -34,6 +34,17 @@
#include <math.h>
#include <assert.h>
static void ami_bitmap_tile_hook(struct Hook *hook,struct RastPort *rp,struct BackFillMessage *bfmsg);
struct bfbitmap {
struct BitMap *bm;
ULONG width;
ULONG height;
int offsetx;
int offsety;
};
#ifndef M_PI /* For some reason we don't always get this from math.h */
#define M_PI 3.14159265358979323846
#endif
@ -413,6 +424,7 @@ bool ami_bitmap_tile(int x, int y, int width, int height,
int xf,yf,xm,ym,oy,ox;
struct BitMap *tbm = NULL;
struct Hook *bfh = NULL;
struct bfbitmap bfbm;
if(!(repeat_x || repeat_y))
return ami_bitmap(x, y, width, height, bitmap, bg, content);
@ -457,19 +469,35 @@ bool ami_bitmap_tile(int x, int y, int width, int height,
ym = y;
}
bfh = CreateBackFillHook(BFHA_BitMap,tbm,
if(bitmap->opaque)
{
bfh = CreateBackFillHook(BFHA_BitMap,tbm,
BFHA_Width,width,
BFHA_Height,height,
BFHA_OffsetX,ox,
BFHA_OffsetY,oy,
TAG_DONE);
}
else
{
bfbm.bm = tbm;
bfbm.width = width;
bfbm.height = height;
bfbm.offsetx = ox;
bfbm.offsety = oy;
bfh = AllocVec(sizeof(struct Hook),MEMF_CLEAR);
bfh->h_Entry = (HOOKFUNC)ami_bitmap_tile_hook;
bfh->h_SubEntry = 0;
bfh->h_Data = &bfbm;
}
InstallLayerHook(currp->Layer,bfh);
EraseRect(currp,xm,ym,xf,yf);
InstallLayerHook(currp->Layer,LAYERS_NOBACKFILL);
DeleteBackFillHook(bfh);
if(bitmap->opaque) DeleteBackFillHook(bfh);
else FreeVec(bfh);
if(tbm != bitmap->nativebm)
{
@ -479,6 +507,46 @@ bool ami_bitmap_tile(int x, int y, int width, int height,
return true;
}
static void ami_bitmap_tile_hook(struct Hook *hook,struct RastPort *rp,struct BackFillMessage *bfmsg)
{
int xf,yf;
struct bfbitmap *bfbm = (struct bfbitmap *)hook->h_Data;
/* tile down and across to extents (bfmsg->Bounds.MinX)*/
for (xf = -bfbm->offsetx; xf < bfmsg->Bounds.MaxX; xf += bfbm->width) {
for (yf = -bfbm->offsety; yf < bfmsg->Bounds.MaxY; yf += bfbm->height) {
if(GfxBase->lib_Version >= 53) // AutoDoc says v52, but this function isn't in OS4.0, so checking for v53 (OS4.1)
{
CompositeTags(COMPOSITE_Src_Over_Dest,bfbm->bm,rp->BitMap,
COMPTAG_Flags,COMPFLAG_IgnoreDestAlpha,
COMPTAG_DestX,bfmsg->Bounds.MinX,
COMPTAG_DestY,bfmsg->Bounds.MinY,
COMPTAG_DestWidth,bfmsg->Bounds.MaxX - bfmsg->Bounds.MinX + 1,
COMPTAG_DestHeight,bfmsg->Bounds.MaxY - bfmsg->Bounds.MinY + 1,
COMPTAG_SrcWidth,bfbm->width,
COMPTAG_SrcHeight,bfbm->height,
COMPTAG_OffsetX,xf,
COMPTAG_OffsetY,yf,
TAG_DONE);
}
else
{
BltBitMapTags(BLITA_Width,bfbm->width,
BLITA_Height,bfbm->height,
BLITA_Source,bfbm->bm,
BLITA_Dest,rp,
BLITA_DestX,xf,
BLITA_DestY,yf,
BLITA_SrcType,BLITT_BITMAP,
BLITA_DestType,BLITT_RASTPORT,
BLITA_UseSrcAlpha,TRUE,
TAG_DONE);
}
}
}
}
bool ami_group_start(const char *name)
{
/** optional */