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ector : add path cliping feature in FreeType software backend.

This commit is contained in:
Subhransu Sekhar Mohanty 2015-04-03 16:33:05 +02:00 committed by Cedric BAIL
parent cb1226ad41
commit 10dca9f68e
1 changed files with 84 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

87
src/lib/ector/software/ector_software_rasterizer.c
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@ -147,6 +147,68 @@ SW_FT_Span *_intersect_spans_rect(const Eina_Rectangle *clip, const SW_FT_Span *
return spans;
}
static inline int
_div_255(int x) { return (x + (x>>8) + 0x80) >> 8; }
static const
SW_FT_Span *_intersect_spans_region(const Shape_Rle_Data *clip, int *currentClip,
const SW_FT_Span *spans, const SW_FT_Span *end,
SW_FT_Span **outSpans, int available)
{
SW_FT_Span *out = *outSpans;
const SW_FT_Span *clipSpans = clip->spans + *currentClip;
const SW_FT_Span *clipEnd = clip->spans + clip->size;
while (available && spans < end ) {
if (clipSpans >= clipEnd) {
spans = end;
break;
}
if (clipSpans->y > spans->y) {
++spans;
continue;
}
if (spans->y != clipSpans->y) {
++clipSpans;
continue;
}
//assert(spans->y == clipSpans->y);
int sx1 = spans->x;
int sx2 = sx1 + spans->len;
int cx1 = clipSpans->x;
int cx2 = cx1 + clipSpans->len;
if (cx1 < sx1 && cx2 < sx1) {
++clipSpans;
continue;
} else if (sx1 < cx1 && sx2 < cx1) {
++spans;
continue;
}
int x = MAX(sx1, cx1);
int len = MIN(sx2, cx2) - x;
if (len) {
out->x = MAX(sx1, cx1);
out->len = MIN(sx2, cx2) - out->x;
out->y = spans->y;
out->coverage = _div_255(spans->coverage * clipSpans->coverage);
++out;
--available;
}
if (sx2 < cx2) {
++spans;
} else {
++clipSpans;
}
}
*outSpans = out;
*currentClip = clipSpans - clip->spans;
return spans;
}
static void
_span_fill_clipRect(int spanCount, const SW_FT_Span *spans, void *userData)
{
@ -167,8 +229,6 @@ _span_fill_clipRect(int spanCount, const SW_FT_Span *spans, void *userData)
tmpRect.y = rect->y - fillData->offy;
tmpRect.w = rect->w;
tmpRect.h = rect->h;
//printf("Clip after Offset : %d , %d ,%d , %d\n",tmpRect.x, tmpRect.y, tmpRect.w, tmpRect.h);
//printf("Offset = %d , %d \n", fillData->offx, fillData->offy);
const SW_FT_Span *end = spans + spanCount;
while (spans < end)
@ -181,6 +241,27 @@ _span_fill_clipRect(int spanCount, const SW_FT_Span *spans, void *userData)
}
}
static void
_span_fill_clipPath(int spanCount, const SW_FT_Span *spans, void *userData)
{
const int NSPANS = 256;
int current_clip = 0;
SW_FT_Span cspans[NSPANS];
Span_Data *fillData = (Span_Data *) userData;
Clip_Data clip = fillData->clip;
//TODO take clip path offset into account.
const SW_FT_Span *end = spans + spanCount;
while (spans < end)
{
SW_FT_Span *clipped = cspans;
spans = _intersect_spans_region(clip.path, &current_clip, spans, end, &clipped, NSPANS);
if (clipped - cspans)
fillData->unclipped_blend(clipped - cspans, cspans, fillData);
}
}
static void
_adjust_span_fill_methods(Span_Data *spdata)
{
@ -216,7 +297,7 @@ _adjust_span_fill_methods(Span_Data *spdata)
}
else
{
spdata->blend = &_span_fill_clipRect; //TODO change when do path clipping
spdata->blend = &_span_fill_clipPath;
}
}