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textoverlay: Only use a single cairo surface for drawing

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... and comment/optimize what is going on here a bit better.
This commit is contained in:
Sebastian Dröge 2009-10-22 09:08:04 +02:00
parent bdfb4b46d7
commit eccd28d7b0
1 changed files with 29 additions and 47 deletions
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76
ext/pango/gsttextoverlay.c
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@ -1158,8 +1158,6 @@ gst_text_overlay_render_pangocairo (GstTextOverlay * overlay,
{
cairo_t *cr;
cairo_surface_t *surface;
cairo_t *cr_shadow;
cairo_surface_t *surface_shadow;
PangoRectangle ink_rect, logical_rect;
cairo_matrix_t cairo_matrix;
int width, height;
@ -1227,67 +1225,51 @@ gst_text_overlay_render_pangocairo (GstTextOverlay * overlay,
} else {
cairo_matrix_init_scale (&cairo_matrix, scalef, scalef);
}
/* clear shadow surface */
surface_shadow = cairo_image_surface_create (CAIRO_FORMAT_A8, width, height);
cr_shadow = cairo_create (surface_shadow);
cairo_set_operator (cr_shadow, CAIRO_OPERATOR_CLEAR);
cairo_paint (cr_shadow);
cairo_set_operator (cr_shadow, CAIRO_OPERATOR_OVER);
cairo_save (cr_shadow);
cairo_set_matrix (cr_shadow, &cairo_matrix);
cairo_save (cr_shadow);
/* draw shadow text */
cairo_set_source_rgba (cr_shadow, 0.0, 0.0, 0.0, 0.5);
cairo_translate (cr_shadow, overlay->shadow_offset, overlay->shadow_offset);
pango_cairo_show_layout (cr_shadow, overlay->layout);
cairo_restore (cr_shadow);
/* draw outline text */
cairo_save (cr_shadow);
cairo_set_source_rgb (cr_shadow, 0.0, 0.0, 0.0);
cairo_set_line_width (cr_shadow, overlay->outline_offset);
pango_cairo_layout_path (cr_shadow, overlay->layout);
cairo_stroke (cr_shadow);
cairo_restore (cr_shadow);
if (overlay->want_shading) {
cairo_paint_with_alpha (cr_shadow, overlay->shading_value);
}
cairo_restore (cr_shadow);
cairo_destroy (cr_shadow);
/* clear image surface */
/* reallocate surface */
overlay->text_image = g_realloc (overlay->text_image, 4 * width * height);
surface = cairo_image_surface_create_for_data (overlay->text_image,
CAIRO_FORMAT_ARGB32, width, height, width * 4);
cr = cairo_create (surface);
/* clear surface */
cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
cairo_paint (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
/* set default color */
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
/* apply transformations */
cairo_set_matrix (cr, &cairo_matrix);
/* draw text to cairo path */
pango_cairo_layout_path (cr, overlay->layout);
/* draw shadow text */
cairo_save (cr);
cairo_set_matrix (cr, &cairo_matrix);
/* draw text */
cairo_set_matrix (cr, &cairo_matrix);
/* draw text */
pango_cairo_show_layout (cr, overlay->layout);
cairo_translate (cr, overlay->shadow_offset, overlay->shadow_offset);
cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.5);
cairo_fill_preserve (cr);
cairo_restore (cr);
/* composite outline, shadow, and text */
cairo_set_operator (cr, CAIRO_OPERATOR_DEST_OVER);
cairo_set_source_surface (cr, surface_shadow, 0.0, 0.0);
cairo_paint (cr);
/* draw outline text */
cairo_save (cr);
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
cairo_set_line_width (cr, overlay->outline_offset);
cairo_stroke_preserve (cr);
cairo_restore (cr);
if (overlay->want_shading) {
cairo_paint_with_alpha (cr, overlay->shading_value);
}
/* draw text */
cairo_save (cr);
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
cairo_fill (cr);
cairo_restore (cr);
cairo_destroy (cr);
cairo_surface_destroy (surface_shadow);
cairo_surface_destroy (surface);
overlay->image_width = width;
overlay->image_height = height;