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textrender: Add bound checks to not write outside the image area

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Jindrich Makovicka 2011-05-26 10:43:51 +02:00 committed by Sebastian Dröge
parent fe533c9995
commit c186d400e5
1 changed files with 10 additions and 8 deletions
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18
ext/pango/gsttextrender.c
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@ -380,8 +380,10 @@ gst_text_render_fixate_caps (GstPad * pad, GstCaps * caps)
GstStructure *s = gst_caps_get_structure (caps, 0); GstStructure *s = gst_caps_get_structure (caps, 0);
GST_DEBUG ("Fixating caps %" GST_PTR_FORMAT, caps); GST_DEBUG ("Fixating caps %" GST_PTR_FORMAT, caps);
gst_structure_fixate_field_nearest_int (s, "width", render->image_width); gst_structure_fixate_field_nearest_int (s, "width", MAX (render->image_width,
gst_structure_fixate_field_nearest_int (s, "height", render->image_height); DEFAULT_RENDER_WIDTH));
gst_structure_fixate_field_nearest_int (s, "height",
MAX (render->image_height + render->ypad, DEFAULT_RENDER_HEIGHT));
GST_DEBUG ("Fixated to %" GST_PTR_FORMAT, caps); GST_DEBUG ("Fixated to %" GST_PTR_FORMAT, caps);
gst_object_unref (render); gst_object_unref (render);
@ -404,12 +406,12 @@ gst_text_renderer_image_to_ayuv (GstTextRender * render, guchar * pixbuf,
width = render->image_width; width = render->image_width;
height = render->image_height; height = render->image_height;
bitp = render->text_image;
for (y = 0; y < height; y++) { for (y = 0; y < height && ypos + y < render->height; y++) {
int n; int n;
p = pixbuf + (ypos + y) * stride + xpos * 4; p = pixbuf + (ypos + y) * stride + xpos * 4;
for (n = 0; n < width; n++) { bitp = render->text_image + y * width * 4;
for (n = 0; n < width && n < render->width; n++) {
b = bitp[CAIRO_ARGB_B]; b = bitp[CAIRO_ARGB_B];
g = bitp[CAIRO_ARGB_G]; g = bitp[CAIRO_ARGB_G];
r = bitp[CAIRO_ARGB_R]; r = bitp[CAIRO_ARGB_R];
@ -440,11 +442,11 @@ gst_text_renderer_image_to_argb (GstTextRender * render, guchar * pixbuf,
width = render->image_width; width = render->image_width;
height = render->image_height; height = render->image_height;
bitp = render->text_image;
for (i = 0; i < height; i++) { for (i = 0; i < height && ypos + i < render->height; i++) {
p = pixbuf + (ypos + i) * stride + xpos * 4; p = pixbuf + (ypos + i) * stride + xpos * 4;
for (j = 0; j < width; j++) { bitp = render->text_image + i * width * 4;
for (j = 0; j < width && j < render->width; j++) {
p[0] = bitp[CAIRO_ARGB_A]; p[0] = bitp[CAIRO_ARGB_A];
p[1] = bitp[CAIRO_ARGB_R]; p[1] = bitp[CAIRO_ARGB_R];
p[2] = bitp[CAIRO_ARGB_G]; p[2] = bitp[CAIRO_ARGB_G];