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Calculate text bounding box in a way that does not depend on actual glyph 

bitmaps. Each glyph is considered to be bounded by (origin, origin + advance)
horizontally, and (max font ascender, max font descender) vertically.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@20734 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
eugeni 2006-11-06 02:47:57 +00:00
parent 1ddae89697
commit c8b995cf2f
1 changed files with 15 additions and 36 deletions
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51
libass/ass_render.c
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@ -492,43 +492,24 @@ static int y2scr_sub(int y) {
return y * frame_context.orig_height / frame_context.track->PlayResY + global_settings->top_margin;
}
static void vmirror_bbox(FT_BBox* orig, FT_BBox* pbbox) {
pbbox->xMin = orig->xMin;
pbbox->xMax = orig->xMax;
pbbox->yMin = - orig->yMax;
pbbox->yMax = - orig->yMin;
}
static void compute_string_bbox( text_info_t* info, FT_BBox *abbox ) {
FT_BBox bbox;
int n;
int i;
/* initialize string bbox to "empty" values */
bbox.xMin = bbox.yMin = 32000;
bbox.xMax = bbox.yMax = -32000;
/* for each glyph image, compute its bounding box, */
/* translate it, and grow the string bbox */
for ( n = 0; n < info->length; n++ ) {
FT_BBox glyph_bbox;
vmirror_bbox( &(info->glyphs[n].bbox), &glyph_bbox );
glyph_bbox.xMin += info->glyphs[n].pos.x;
glyph_bbox.xMax += info->glyphs[n].pos.x;
glyph_bbox.yMin += info->glyphs[n].pos.y;
glyph_bbox.yMax += info->glyphs[n].pos.y;
if ( glyph_bbox.xMin < bbox.xMin ) bbox.xMin = glyph_bbox.xMin;
if ( glyph_bbox.yMin < bbox.yMin ) bbox.yMin = glyph_bbox.yMin;
if ( glyph_bbox.xMax > bbox.xMax ) bbox.xMax = glyph_bbox.xMax;
if ( glyph_bbox.yMax > bbox.yMax ) bbox.yMax = glyph_bbox.yMax;
}
/* check that we really grew the string bbox */
if ( bbox.xMin > bbox.xMax ) {
bbox.xMin = 0;
bbox.yMin = 0;
bbox.xMax = 0;
bbox.yMax = 0;
}
if (text_info.length > 0) {
bbox.xMin = 32000;
bbox.xMax = -32000;
bbox.yMin = - (text_info.lines[0].asc >> 6) + text_info.glyphs[0].pos.y;
bbox.yMax = ((text_info.height - text_info.lines[0].asc) >> 6) + text_info.glyphs[0].pos.y;
for (i = 0; i < text_info.length; ++i) {
int s = text_info.glyphs[i].pos.x;
int e = s + (text_info.glyphs[i].advance.x >> 6);
bbox.xMin = FFMIN(bbox.xMin, s);
bbox.xMax = FFMAX(bbox.xMax, e);
}
} else
bbox.xMin = bbox.xMax = bbox.yMin = bbox.yMax = 0;
/* return string bbox */
*abbox = bbox;
@ -1774,8 +1755,6 @@ static int ass_render_event(ass_event_t* event, event_images_t* event_images)
// determing text bounding box
compute_string_bbox(&text_info, &bbox);
bbox.yMin = - (text_info.lines[0].asc >> 6);
bbox.yMax = (text_info.height - text_info.lines[0].asc) >> 6;
// determine device coordinates for text