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ext/cairo/gsttextoverlay.c: Improvements to actually render text as white on black outline on video, including font s...
Original commit message from CVS: * ext/cairo/gsttextoverlay.c: (gst_textoverlay_render_text), (gst_text_overlay_blit_1), (gst_text_overlay_blit_sub2x2), (gst_textoverlay_video_chain), (gst_textoverlay_loop), (gst_textoverlay_font_init), (gst_textoverlay_init), (gst_textoverlay_set_property): Improvements to actually render text as white on black outline on video, including font selection and horizontal/vertical alignment. (Ronald's christmas present) * ext/cairo/gsttextoverlay.h:
This commit is contained in:
David Schleef
parent
257f1aa294
commit
3065ec53ca
3 changed files with 151 additions and 78 deletions
12
ChangeLog
12
ChangeLog
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@ -1,3 +1,15 @@
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2004-12-27 David Schleef <ds@schleef.org>
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* ext/cairo/gsttextoverlay.c: (gst_textoverlay_render_text),
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(gst_text_overlay_blit_1), (gst_text_overlay_blit_sub2x2),
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(gst_textoverlay_video_chain), (gst_textoverlay_loop),
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(gst_textoverlay_font_init), (gst_textoverlay_init),
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(gst_textoverlay_set_property): Improvements to actually
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render text as white on black outline on video, including
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font selection and horizontal/vertical alignment. (Ronald's
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christmas present)
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* ext/cairo/gsttextoverlay.h:
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2004-12-26 Stephane Loeuillet <stephane.loeuillet@tiscali.fr>
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* ext/ogg/gstogg.c:
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@ -213,18 +213,22 @@ gst_textoverlay_render_text (GstTextOverlay * overlay, gchar * text,
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{
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cairo_text_extents_t extents;
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char *string;
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double x, y;
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string = g_strdup_printf ("%.*s", textlen, text);
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string = g_strndup (text, textlen);
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if (overlay->pixbuf)
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g_free (overlay->pixbuf);
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overlay->pixbuf = g_malloc (4 * overlay->width * overlay->text_height);
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cairo_set_target_image (overlay->cr, overlay->pixbuf, CAIRO_FORMAT_ARGB32,
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overlay->width, overlay->text_height, overlay->width * 4);
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if (overlay->text_fill_image)
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g_free (overlay->text_fill_image);
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overlay->text_fill_image =
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g_malloc (4 * overlay->width * overlay->text_height);
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cairo_set_target_image (overlay->cr, overlay->text_fill_image,
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CAIRO_FORMAT_ARGB32, overlay->width, overlay->text_height,
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overlay->width * 4);
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cairo_save (overlay->cr);
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cairo_rectangle (overlay->cr, 0, 0, overlay->width, overlay->text_height);
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cairo_set_alpha (overlay->cr, 0.0);
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cairo_set_rgb_color (overlay->cr, 0, 0, 0);
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cairo_set_alpha (overlay->cr, 1.0);
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cairo_set_operator (overlay->cr, CAIRO_OPERATOR_SRC);
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cairo_fill (overlay->cr);
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cairo_restore (overlay->cr);
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@ -232,19 +236,51 @@ gst_textoverlay_render_text (GstTextOverlay * overlay, gchar * text,
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cairo_save (overlay->cr);
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cairo_text_extents (overlay->cr, string, &extents);
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cairo_set_rgb_color (overlay->cr, 1, 1, 1);
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cairo_move_to (overlay->cr, 0, overlay->text_height - 2);
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cairo_set_alpha (overlay->cr, 1.0);
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switch (overlay->halign) {
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case GST_TEXT_OVERLAY_HALIGN_LEFT:
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x = overlay->x0;
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break;
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case GST_TEXT_OVERLAY_HALIGN_CENTER:
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x = overlay->x0 - extents.width / 2;
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break;
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case GST_TEXT_OVERLAY_HALIGN_RIGHT:
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x = overlay->x0 - extents.width;
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break;
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default:
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x = 0;
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}
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y = overlay->text_height - 2;
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cairo_move_to (overlay->cr, x, y);
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cairo_show_text (overlay->cr, string);
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cairo_text_path (overlay->cr, string);
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cairo_set_rgb_color (overlay->cr, 0, 0, 0);
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cairo_set_line_width (overlay->cr, 1.0);
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cairo_stroke (overlay->cr);
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g_free (string);
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cairo_restore (overlay->cr);
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overlay->text_width = MIN (extents.width, overlay->width);
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if (overlay->text_outline_image)
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g_free (overlay->text_outline_image);
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overlay->text_outline_image =
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g_malloc (4 * overlay->width * overlay->text_height);
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cairo_set_target_image (overlay->cr, overlay->text_outline_image,
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CAIRO_FORMAT_ARGB32, overlay->width, overlay->text_height,
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overlay->width * 4);
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cairo_save (overlay->cr);
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cairo_rectangle (overlay->cr, 0, 0, overlay->width, overlay->text_height);
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cairo_set_rgb_color (overlay->cr, 0, 0, 0);
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cairo_set_alpha (overlay->cr, 1.0);
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cairo_set_operator (overlay->cr, CAIRO_OPERATOR_SRC);
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cairo_fill (overlay->cr);
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cairo_restore (overlay->cr);
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cairo_save (overlay->cr);
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cairo_move_to (overlay->cr, x, y);
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cairo_set_rgb_color (overlay->cr, 1, 1, 1);
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cairo_set_alpha (overlay->cr, 1.0);
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cairo_set_line_width (overlay->cr, 1.0);
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cairo_text_path (overlay->cr, string);
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cairo_stroke (overlay->cr);
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cairo_restore (overlay->cr);
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g_free (string);
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}
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/* static GstPadLinkReturn */
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@ -272,36 +308,47 @@ gst_textoverlay_video_sinkconnect (GstPad * pad, const GstCaps * caps)
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static void
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gst_text_overlay_blit_yuv420 (GstTextOverlay * overlay, guchar * pixbuf,
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int x0, int y0)
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gst_text_overlay_blit_1 (GstTextOverlay * overlay, guchar * dest,
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guchar * text_image, int val)
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{
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int i;
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int j;
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int x, a, y;
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int y0 = 0;
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if (x0 < 0)
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x0 = 0;
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if (y0 < 0)
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y0 = 0;
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GST_LOG ("%d %d %d %d %d %d %p", overlay->text_width, overlay->text_height,
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overlay->width, overlay->height, x0, y0, pixbuf);
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y = val;
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for (i = 0; i < overlay->text_height; i++) {
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for (j = 0; j < overlay->text_width; j++) {
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#if 0
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x = pixbuf[(i + y0) * overlay->width + (j + x0)];
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a = overlay->pixbuf[4 * (i * overlay->width + j) + 0];
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y = overlay->pixbuf[4 * (i * overlay->width + j) + 1];
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pixbuf[(i + y0) * overlay->width + (j + x0)] =
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(y * a + x * (255 - a)) / 255;
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#endif
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x = a = 0;
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y = overlay->pixbuf[4 * (i * overlay->width + j) + 1];
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pixbuf[(i + y0) * overlay->width + (j + x0)] = y;
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for (j = 0; j < overlay->width; j++) {
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x = dest[(i + y0) * overlay->width + j];
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a = text_image[4 * (i * overlay->width + j) + 1];
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dest[(i + y0) * overlay->width + j] = (y * a + x * (255 - a)) / 255;
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}
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}
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}
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static void
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gst_text_overlay_blit_sub2x2 (GstTextOverlay * overlay, guchar * dest,
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guchar * text_image, int val)
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{
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int i;
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int j;
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int x, a, y;
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int y0 = 0;
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y = val;
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for (i = 0; i < overlay->text_height; i += 2) {
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for (j = 0; j < overlay->width; j += 2) {
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x = dest[(i / 2 + y0) * (overlay->width / 2) + j / 2];
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a = (text_image[4 * (i * overlay->width + j) + 1] +
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text_image[4 * (i * overlay->width + j + 1) + 1] +
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text_image[4 * ((i + 1) * overlay->width + j) + 1] +
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text_image[4 * ((i + 1) * overlay->width + j + 1) + 1] + 2) / 4;
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dest[(i / 2 + y0) * (overlay->width / 2) + j / 2] =
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(y * a + x * (255 - a)) / 255;
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}
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}
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}
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@ -311,7 +358,7 @@ gst_textoverlay_video_chain (GstPad * pad, GstData * _data)
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GstBuffer *buf = GST_BUFFER (_data);
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GstTextOverlay *overlay;
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guchar *pixbuf;
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gint x0, y0;
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gint y;
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g_return_if_fail (pad != NULL);
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g_return_if_fail (GST_IS_PAD (pad));
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@ -325,32 +372,38 @@ gst_textoverlay_video_chain (GstPad * pad, GstData * _data)
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pixbuf = GST_BUFFER_DATA (buf);
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x0 = overlay->x0;
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y0 = overlay->y0;
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y = overlay->y0;
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switch (overlay->valign) {
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case GST_TEXT_OVERLAY_VALIGN_BOTTOM:
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y0 -= overlay->text_height;
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y -= overlay->text_height;
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break;
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case GST_TEXT_OVERLAY_VALIGN_BASELINE:
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#define BASELINE 2
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y0 -= (overlay->text_height - BASELINE);
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y -= (overlay->text_height - BASELINE);
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break;
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case GST_TEXT_OVERLAY_VALIGN_TOP:
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break;
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}
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switch (overlay->halign) {
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case GST_TEXT_OVERLAY_HALIGN_LEFT:
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break;
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case GST_TEXT_OVERLAY_HALIGN_RIGHT:
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x0 -= overlay->text_width;
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break;
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case GST_TEXT_OVERLAY_HALIGN_CENTER:
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x0 -= overlay->text_width;
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break;
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}
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gst_text_overlay_blit_1 (overlay,
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pixbuf + y * overlay->width, overlay->text_outline_image, 0);
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gst_text_overlay_blit_sub2x2 (overlay,
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pixbuf + (overlay->height * overlay->width) +
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(y / 2) * overlay->width / 2, overlay->text_outline_image, 128);
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gst_text_overlay_blit_sub2x2 (overlay, pixbuf +
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(overlay->height * overlay->width) +
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(overlay->height * overlay->width) / 4 + (y / 2) * overlay->width / 2,
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overlay->text_outline_image, 128);
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gst_text_overlay_blit_yuv420 (overlay, pixbuf, x0, y0);
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gst_text_overlay_blit_1 (overlay, pixbuf + y * overlay->width,
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overlay->text_fill_image, 255);
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gst_text_overlay_blit_sub2x2 (overlay,
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pixbuf + (overlay->height * overlay->width) +
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(y / 2) * overlay->width / 2, overlay->text_fill_image, 128);
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gst_text_overlay_blit_sub2x2 (overlay,
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pixbuf + (overlay->height * overlay->width) +
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(overlay->height * overlay->width) / 4 + (y / 2) * overlay->width / 2,
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overlay->text_fill_image, 128);
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gst_pad_push (overlay->srcpad, GST_DATA (buf));
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}
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@ -443,6 +496,22 @@ gst_textoverlay_loop (GstElement * element)
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gst_textoverlay_video_chain (overlay->srcpad, GST_DATA (video_frame));
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}
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static void
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gst_textoverlay_font_init (GstTextOverlay * overlay)
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{
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cairo_font_extents_t font_extents;
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cairo_select_font (overlay->cr, overlay->font, overlay->slant,
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overlay->weight);
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cairo_scale_font (overlay->cr, overlay->scale);
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cairo_current_font_extents (overlay->cr, &font_extents);
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overlay->text_height = font_extents.height;
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if (overlay->text_height & 1)
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overlay->text_height++;
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overlay->need_render = TRUE;
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}
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static GstElementStateReturn
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gst_textoverlay_change_state (GstElement * element)
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@ -480,8 +549,6 @@ gst_textoverlay_finalize (GObject * object)
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static void
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gst_textoverlay_init (GstTextOverlay * overlay)
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{
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cairo_font_extents_t font_extents;
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/* video sink */
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overlay->video_sinkpad =
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gst_pad_new_from_template (gst_static_pad_template_get
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@ -511,16 +578,15 @@ gst_textoverlay_init (GstTextOverlay * overlay)
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overlay->default_text = g_strdup ("");
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overlay->need_render = TRUE;
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cairo_select_font (overlay->cr, "sans", 0, 0);
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cairo_scale_font (overlay->cr, 50);
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cairo_current_font_extents (overlay->cr, &font_extents);
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overlay->text_height = font_extents.height;
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overlay->font = g_strdup ("sans");
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overlay->slant = CAIRO_FONT_SLANT_NORMAL;
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overlay->weight = CAIRO_FONT_WEIGHT_NORMAL;
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overlay->scale = 20;
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gst_textoverlay_font_init (overlay);
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gst_element_set_loop_function (GST_ELEMENT (overlay), gst_textoverlay_loop);
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}
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static void
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gst_textoverlay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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@ -551,6 +617,7 @@ gst_textoverlay_set_property (GObject * object, guint prop_id,
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else
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g_warning ("Invalid 'valign' property value: %s",
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g_value_get_string (value));
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overlay->need_render = TRUE;
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break;
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case ARG_HALIGN:
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@ -563,6 +630,7 @@ gst_textoverlay_set_property (GObject * object, guint prop_id,
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else
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g_warning ("Invalid 'halign' property value: %s",
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g_value_get_string (value));
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overlay->need_render = TRUE;
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break;
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case ARG_X0:
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@ -574,22 +642,11 @@ gst_textoverlay_set_property (GObject * object, guint prop_id,
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break;
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case ARG_FONT_DESC:
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{
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#if 0
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PangoFontDescription *desc;
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desc = pango_font_description_from_string (g_value_get_string (value));
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if (desc) {
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g_message ("font description set: %s", g_value_get_string (value));
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pango_layout_set_font_description (overlay->layout, desc);
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pango_font_description_free (desc);
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render_text (overlay);
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} else
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g_warning ("font description parse failed: %s",
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g_value_get_string (value));
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#endif
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if (overlay->font)
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g_free (overlay->font);
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overlay->font = g_strdup (g_value_get_string (value));
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gst_textoverlay_font_init (overlay);
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break;
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}
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default:
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break;
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@ -54,14 +54,18 @@ struct _GstTextOverlay {
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gchar *default_text;
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cairo_t *cr;
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guchar *pixbuf;
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int text_width;
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guchar *text_fill_image;
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guchar *text_outline_image;
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int text_height;
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GstBuffer *current_buffer;
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GstBuffer *next_buffer;
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gboolean need_render;
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gchar *font;
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int slant;
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int weight;
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double scale;
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};
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struct _GstTextOverlayClass {
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