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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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45
gdk/gdkpixbuf-render.c
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@ -57,8 +57,7 @@ gdk_pixbuf_render_threshold_alpha (GdkPixbuf *pixbuf,
int height,
int alpha_threshold)
{
GdkGC *gc;
GdkColor color;
cairo_t *cr;
int x, y;
guchar *p;
int start, start_status;
@ -84,22 +83,31 @@ gdk_pixbuf_render_threshold_alpha (GdkPixbuf *pixbuf,
if (width == 0 || height == 0)
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))
{
color.pixel = (alpha_threshold == 255) ? 0 : 1;
gdk_gc_set_foreground (gc, &color);
gdk_draw_rectangle (bitmap, gc, TRUE, dest_x, dest_y, width, height);
cairo_set_source_rgba (cr, 0, 0, 0, alpha_threshold == 255 ? 0 : 1);
cairo_paint (cr);
cairo_destroy (cr);
return;
}
color.pixel = 0;
gdk_gc_set_foreground (gc, &color);
gdk_draw_rectangle (bitmap, gc, TRUE, dest_x, dest_y, width, height);
cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
cairo_paint (cr);
color.pixel = 1;
gdk_gc_set_foreground (gc, &color);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
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++)
{
@ -116,9 +124,9 @@ gdk_pixbuf_render_threshold_alpha (GdkPixbuf *pixbuf,
if (status != start_status)
{
if (!start_status)
gdk_draw_line (bitmap, gc,
start + dest_x, y + dest_y,
x - 1 + dest_x, y + dest_y);
cairo_rectangle (cr,
start + dest_x, y + dest_y,
x + dest_x, y + dest_y + 1);
start = x;
start_status = status;
@ -128,10 +136,13 @@ gdk_pixbuf_render_threshold_alpha (GdkPixbuf *pixbuf,
}
if (!start_status)
gdk_draw_line (bitmap, gc,
start + dest_x, y + dest_y,
x - 1 + dest_x, y + dest_y);
cairo_rectangle (cr,
start + dest_x, y + dest_y,
x + dest_x, y + dest_y + 1);
}
cairo_fill (cr);
cairo_destroy (cr);
}
/**