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gdkpixbuf: Implement gdk_pixbuf_render_threshold_alpha() with Cairo

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This commit is contained in:
Benjamin Otte
2010-07-15 17:49:08 +02:00
parent 5649431acb
commit 37c502eae3
1 changed files with 28 additions and 17 deletions
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41
gdk/gdkpixbuf-render.c
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@ -57,8 +57,7 @@ gdk_pixbuf_render_threshold_alpha (GdkPixbuf *pixbuf,
int height, int height,
int alpha_threshold) int alpha_threshold)
{ {
GdkGC *gc; cairo_t *cr;
GdkColor color;
int x, y; int x, y;
guchar *p; guchar *p;
int start, start_status; int start, start_status;
@ -84,22 +83,31 @@ gdk_pixbuf_render_threshold_alpha (GdkPixbuf *pixbuf,
if (width == 0 || height == 0) if (width == 0 || height == 0)
return; return;
gc = _gdk_drawable_get_scratch_gc (bitmap, FALSE); cr = gdk_cairo_create (bitmap);
cairo_rectangle (cr, dest_x, dest_y, width, height);
cairo_clip (cr);
if (!gdk_pixbuf_get_has_alpha (pixbuf)) if (!gdk_pixbuf_get_has_alpha (pixbuf))
{ {
color.pixel = (alpha_threshold == 255) ? 0 : 1; cairo_set_source_rgba (cr, 0, 0, 0, alpha_threshold == 255 ? 0 : 1);
gdk_gc_set_foreground (gc, &color); cairo_paint (cr);
gdk_draw_rectangle (bitmap, gc, TRUE, dest_x, dest_y, width, height); cairo_destroy (cr);
return; return;
} }
color.pixel = 0; cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
gdk_gc_set_foreground (gc, &color); cairo_paint (cr);
gdk_draw_rectangle (bitmap, gc, TRUE, dest_x, dest_y, width, height);
color.pixel = 1; cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
gdk_gc_set_foreground (gc, &color); if (alpha_threshold == 128)
{
gdk_cairo_set_source_pixbuf (cr, pixbuf, src_x - dest_x, src_y - dest_y);
cairo_paint (cr);
cairo_destroy (cr);
return;
}
cairo_set_source_rgb (cr, 0, 0, 0);
for (y = 0; y < height; y++) for (y = 0; y < height; y++)
{ {
@ -116,9 +124,9 @@ gdk_pixbuf_render_threshold_alpha (GdkPixbuf *pixbuf,
if (status != start_status) if (status != start_status)
{ {
if (!start_status) if (!start_status)
gdk_draw_line (bitmap, gc, cairo_rectangle (cr,
start + dest_x, y + dest_y, start + dest_x, y + dest_y,
x - 1 + dest_x, y + dest_y); x + dest_x, y + dest_y + 1);
start = x; start = x;
start_status = status; start_status = status;
@ -128,10 +136,13 @@ gdk_pixbuf_render_threshold_alpha (GdkPixbuf *pixbuf,
} }
if (!start_status) if (!start_status)
gdk_draw_line (bitmap, gc, cairo_rectangle (cr,
start + dest_x, y + dest_y, start + dest_x, y + dest_y,
x - 1 + dest_x, y + dest_y); x + dest_x, y + dest_y + 1);
} }
cairo_fill (cr);
cairo_destroy (cr);
} }
/** /**