--- /dev/null
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ * Copyright (C) <2003> David Schleef <ds@schleef.org>
+ * Copyright (C) <2009> Young-Ho Cha <ganadist@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+
+/**
+ * SECTION:element-textrender
+ * @see_also: #GstTextOverlay
+ *
+ * This plugin renders text received on the text sink pad to a video
+ * buffer (retaining the alpha channel), so it can later be overlayed
+ * on top of video streams using other elements.
+ *
+ * The text can contain newline characters. (FIXME: What about text
+ * wrapping? It does not make sense in this context)
+ *
+ * <refsect2>
+ * <title>Example launch lines</title>
+ * |[
+ * gst-launch -v filesrc location=subtitles.srt ! subparse ! textrender ! xvimagesink
+ * ]|
+ * </refsect2>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <gst/gst.h>
+#include <gst/video/video.h>
+
+#include "gsttextrender.h"
+#include <string.h>
+
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+# define CAIRO_ARGB_A 3
+# define CAIRO_ARGB_R 2
+# define CAIRO_ARGB_G 1
+# define CAIRO_ARGB_B 0
+#else
+# define CAIRO_ARGB_A 0
+# define CAIRO_ARGB_R 1
+# define CAIRO_ARGB_G 2
+# define CAIRO_ARGB_B 3
+#endif
+
+GST_DEBUG_CATEGORY_EXTERN (pango_debug);
+#define GST_CAT_DEFAULT pango_debug
+
+#define MINIMUM_OUTLINE_OFFSET 1.0
+
+#define DEFAULT_PROP_VALIGNMENT GST_TEXT_RENDER_VALIGN_BASELINE
+#define DEFAULT_PROP_HALIGNMENT GST_TEXT_RENDER_HALIGN_CENTER
+#define DEFAULT_PROP_LINE_ALIGNMENT GST_TEXT_RENDER_LINE_ALIGN_CENTER
+#define DEFAULT_PROP_XPAD 25
+#define DEFAULT_PROP_YPAD 25
+
+#define DEFAULT_RENDER_WIDTH 720
+#define DEFAULT_RENDER_HEIGHT 576
+
+enum
+{
+ PROP_0,
+ PROP_HALIGNMENT,
+ PROP_VALIGNMENT,
+ PROP_LINE_ALIGNMENT,
+ PROP_XPAD,
+ PROP_YPAD,
+ PROP_FONT_DESC
+};
+
+
+static GstStaticPadTemplate src_template_factory =
+ GST_STATIC_PAD_TEMPLATE ("src",
+ GST_PAD_SRC,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV") ";" GST_VIDEO_CAPS_ARGB)
+ );
+
+static GstStaticPadTemplate sink_template_factory =
+ GST_STATIC_PAD_TEMPLATE ("sink",
+ GST_PAD_SINK,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS ("text/x-pango-markup; text/plain")
+ );
+
+#define GST_TYPE_TEXT_RENDER_VALIGN (gst_text_render_valign_get_type())
+static GType
+gst_text_render_valign_get_type (void)
+{
+ static GType text_render_valign_type = 0;
+ static const GEnumValue text_render_valign[] = {
+ {GST_TEXT_RENDER_VALIGN_BASELINE, "baseline", "baseline"},
+ {GST_TEXT_RENDER_VALIGN_BOTTOM, "bottom", "bottom"},
+ {GST_TEXT_RENDER_VALIGN_TOP, "top", "top"},
+ {0, NULL, NULL},
+ };
+
+ if (!text_render_valign_type) {
+ text_render_valign_type =
+ g_enum_register_static ("GstTextRenderVAlign", text_render_valign);
+ }
+ return text_render_valign_type;
+}
+
+#define GST_TYPE_TEXT_RENDER_HALIGN (gst_text_render_halign_get_type())
+static GType
+gst_text_render_halign_get_type (void)
+{
+ static GType text_render_halign_type = 0;
+ static const GEnumValue text_render_halign[] = {
+ {GST_TEXT_RENDER_HALIGN_LEFT, "left", "left"},
+ {GST_TEXT_RENDER_HALIGN_CENTER, "center", "center"},
+ {GST_TEXT_RENDER_HALIGN_RIGHT, "right", "right"},
+ {0, NULL, NULL},
+ };
+
+ if (!text_render_halign_type) {
+ text_render_halign_type =
+ g_enum_register_static ("GstTextRenderHAlign", text_render_halign);
+ }
+ return text_render_halign_type;
+}
+
+#define GST_TYPE_TEXT_RENDER_LINE_ALIGN (gst_text_render_line_align_get_type())
+static GType
+gst_text_render_line_align_get_type (void)
+{
+ static GType text_render_line_align_type = 0;
+ static const GEnumValue text_render_line_align[] = {
+ {GST_TEXT_RENDER_LINE_ALIGN_LEFT, "left", "left"},
+ {GST_TEXT_RENDER_LINE_ALIGN_CENTER, "center", "center"},
+ {GST_TEXT_RENDER_LINE_ALIGN_RIGHT, "right", "right"},
+ {0, NULL, NULL}
+ };
+
+ if (!text_render_line_align_type) {
+ text_render_line_align_type =
+ g_enum_register_static ("GstTextRenderLineAlign",
+ text_render_line_align);
+ }
+ return text_render_line_align_type;
+}
+
+static void gst_text_render_adjust_values_with_fontdesc (GstTextRender *
+ render, PangoFontDescription * desc);
+
+GST_BOILERPLATE (GstTextRender, gst_text_render, GstElement, GST_TYPE_ELEMENT);
+
+static void gst_text_render_finalize (GObject * object);
+static void gst_text_render_set_property (GObject * object,
+ guint prop_id, const GValue * value, GParamSpec * pspec);
+static void gst_text_render_get_property (GObject * object,
+ guint prop_id, GValue * value, GParamSpec * pspec);
+
+static void
+gst_text_render_base_init (gpointer g_class)
+{
+ GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&src_template_factory));
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&sink_template_factory));
+
+ gst_element_class_set_details_simple (element_class, "Text renderer",
+ "Filter/Editor/Video",
+ "Renders a text string to an image bitmap",
+ "David Schleef <ds@schleef.org>, "
+ "GStreamer maintainers <gstreamer-devel@lists.sourceforge.net>");
+}
+
+static void
+gst_text_render_class_init (GstTextRenderClass * klass)
+{
+ GObjectClass *gobject_class;
+ PangoFontMap *fontmap;
+
+ gobject_class = (GObjectClass *) klass;
+
+ parent_class = g_type_class_peek_parent (klass);
+
+ gobject_class->finalize = gst_text_render_finalize;
+ gobject_class->set_property = gst_text_render_set_property;
+ gobject_class->get_property = gst_text_render_get_property;
+
+ fontmap = pango_cairo_font_map_get_default ();
+ klass->pango_context =
+ pango_cairo_font_map_create_context (PANGO_CAIRO_FONT_MAP (fontmap));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_FONT_DESC,
+ g_param_spec_string ("font-desc", "font description",
+ "Pango font description of font "
+ "to be used for rendering. "
+ "See documentation of "
+ "pango_font_description_from_string"
+ " for syntax.", "", G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_VALIGNMENT,
+ g_param_spec_enum ("valignment", "vertical alignment",
+ "Vertical alignment of the text", GST_TYPE_TEXT_RENDER_VALIGN,
+ DEFAULT_PROP_VALIGNMENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_HALIGNMENT,
+ g_param_spec_enum ("halignment", "horizontal alignment",
+ "Horizontal alignment of the text", GST_TYPE_TEXT_RENDER_HALIGN,
+ DEFAULT_PROP_HALIGNMENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_XPAD,
+ g_param_spec_int ("xpad", "horizontal paddding",
+ "Horizontal paddding when using left/right alignment", 0, G_MAXINT,
+ DEFAULT_PROP_XPAD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_YPAD,
+ g_param_spec_int ("ypad", "vertical padding",
+ "Vertical padding when using top/bottom alignment", 0, G_MAXINT,
+ DEFAULT_PROP_YPAD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_LINE_ALIGNMENT,
+ g_param_spec_enum ("line-alignment", "line alignment",
+ "Alignment of text lines relative to each other.",
+ GST_TYPE_TEXT_RENDER_LINE_ALIGN, DEFAULT_PROP_LINE_ALIGNMENT,
+ G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+}
+
+static void
+gst_text_render_adjust_values_with_fontdesc (GstTextRender * render,
+ PangoFontDescription * desc)
+{
+ gint font_size = pango_font_description_get_size (desc) / PANGO_SCALE;
+
+ render->shadow_offset = (double) (font_size) / 13.0;
+ render->outline_offset = (double) (font_size) / 15.0;
+ if (render->outline_offset < MINIMUM_OUTLINE_OFFSET)
+ render->outline_offset = MINIMUM_OUTLINE_OFFSET;
+}
+
+static void
+gst_text_render_render_pangocairo (GstTextRender * render)
+{
+ cairo_t *cr;
+ cairo_surface_t *surface;
+ cairo_t *cr_shadow;
+ cairo_surface_t *surface_shadow;
+ PangoRectangle ink_rect, logical_rect;
+ gint width, height;
+
+ pango_layout_get_pixel_extents (render->layout, &ink_rect, &logical_rect);
+
+ width = logical_rect.width + render->shadow_offset;
+ height = logical_rect.height + logical_rect.y + render->shadow_offset;
+
+ surface_shadow = cairo_image_surface_create (CAIRO_FORMAT_A8, width, height);
+ cr_shadow = cairo_create (surface_shadow);
+
+ /* clear shadow surface */
+ cairo_set_operator (cr_shadow, CAIRO_OPERATOR_CLEAR);
+ cairo_paint (cr_shadow);
+ cairo_set_operator (cr_shadow, CAIRO_OPERATOR_OVER);
+
+ /* draw shadow text */
+ cairo_save (cr_shadow);
+ cairo_set_source_rgba (cr_shadow, 0.0, 0.0, 0.0, 0.5);
+ cairo_translate (cr_shadow, render->shadow_offset, render->shadow_offset);
+ pango_cairo_show_layout (cr_shadow, render->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, render->outline_offset);
+ pango_cairo_layout_path (cr_shadow, render->layout);
+ cairo_stroke (cr_shadow);
+ cairo_restore (cr_shadow);
+
+ cairo_destroy (cr_shadow);
+
+ render->text_image = g_realloc (render->text_image, 4 * width * height);
+
+ surface = cairo_image_surface_create_for_data (render->text_image,
+ CAIRO_FORMAT_ARGB32, width, height, width * 4);
+ cr = cairo_create (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);
+
+ cairo_save (cr);
+ /* draw text */
+ pango_cairo_show_layout (cr, render->layout);
+ cairo_restore (cr);
+
+ /* composite shadow with offset */
+ cairo_set_operator (cr, CAIRO_OPERATOR_DEST_OVER);
+ cairo_set_source_surface (cr, surface_shadow, 0.0, 0.0);
+ cairo_paint (cr);
+
+ cairo_destroy (cr);
+ cairo_surface_destroy (surface_shadow);
+ cairo_surface_destroy (surface);
+ render->image_width = width;
+ render->image_height = height;
+}
+
+static void
+gst_text_render_check_argb (GstTextRender * render)
+{
+ GstCaps *peer_caps;
+ peer_caps = gst_pad_get_allowed_caps (render->srcpad);
+ if (G_LIKELY (peer_caps)) {
+ guint i = 0, n = 0;
+
+ n = gst_caps_get_size (peer_caps);
+ GST_DEBUG_OBJECT (render, "peer allowed caps (%u structure(s)) are %"
+ GST_PTR_FORMAT, n, peer_caps);
+
+ /* Check if AYUV or ARGB is first */
+ for (i = 0; i < n; i++) {
+ GstStructure *s = gst_caps_get_structure (peer_caps, i);
+ if (gst_structure_has_name (s, "video/x-raw-rgb") &&
+ gst_structure_has_field (s, "alpha_mask")) {
+ render->use_ARGB = TRUE;
+ break;
+ } else if (gst_structure_has_name (s, "video/x-raw-yuv")) {
+ guint fourcc;
+ if (gst_structure_get_fourcc (s, "format", &fourcc) &&
+ fourcc == GST_MAKE_FOURCC ('A', 'Y', 'U', 'V')) {
+ render->use_ARGB = FALSE;
+ break;
+ }
+ }
+ }
+ gst_caps_unref (peer_caps);
+ }
+}
+
+static gboolean
+gst_text_render_setcaps (GstPad * pad, GstCaps * caps)
+{
+ GstTextRender *render = GST_TEXT_RENDER (gst_pad_get_parent (pad));
+ GstStructure *structure;
+ gboolean ret = FALSE;
+ gint width = 0, height = 0;
+
+ structure = gst_caps_get_structure (caps, 0);
+ gst_structure_get_int (structure, "width", &width);
+ gst_structure_get_int (structure, "height", &height);
+
+ GST_DEBUG ("Got caps %" GST_PTR_FORMAT, caps);
+
+ if (width >= render->image_width && height >= render->image_height) {
+ render->width = width;
+ render->height = height;
+ ret = TRUE;
+ }
+
+ gst_text_render_check_argb (render);
+
+ gst_object_unref (render);
+ return ret;
+}
+
+static void
+gst_text_render_fixate_caps (GstPad * pad, GstCaps * caps)
+{
+ GstTextRender *render = GST_TEXT_RENDER (gst_pad_get_parent (pad));
+ GstStructure *s = gst_caps_get_structure (caps, 0);
+
+ 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, "height", render->image_height);
+ GST_DEBUG ("Fixated to %" GST_PTR_FORMAT, caps);
+
+ gst_object_unref (render);
+}
+
+#define CAIRO_UNPREMULTIPLY(a,r,g,b) G_STMT_START { \
+ b = (a > 0) ? MIN ((b * 255 + a / 2) / a, 255) : 0; \
+ g = (a > 0) ? MIN ((g * 255 + a / 2) / a, 255) : 0; \
+ r = (a > 0) ? MIN ((r * 255 + a / 2) / a, 255) : 0; \
+} G_STMT_END
+
+static void
+gst_text_renderer_image_to_ayuv (GstTextRender * render, guchar * pixbuf,
+ int xpos, int ypos, int stride)
+{
+ int y; /* text bitmap coordinates */
+ guchar *p, *bitp;
+ guchar a, r, g, b;
+ int width, height;
+
+ width = render->image_width;
+ height = render->image_height;
+ bitp = render->text_image;
+
+ for (y = 0; y < height; y++) {
+ int n;
+ p = pixbuf + (ypos + y) * stride + xpos * 4;
+ for (n = 0; n < width; n++) {
+ b = bitp[CAIRO_ARGB_B];
+ g = bitp[CAIRO_ARGB_G];
+ r = bitp[CAIRO_ARGB_R];
+ a = bitp[CAIRO_ARGB_A];
+ bitp += 4;
+
+ /* Cairo uses pre-multiplied ARGB, unpremultiply it */
+ CAIRO_UNPREMULTIPLY (a, r, g, b);
+
+ *p++ = a;
+ *p++ = CLAMP ((int) (((19595 * r) >> 16) + ((38470 * g) >> 16) +
+ ((7471 * b) >> 16)), 0, 255);
+ *p++ = CLAMP ((int) (-((11059 * r) >> 16) - ((21709 * g) >> 16) +
+ ((32768 * b) >> 16) + 128), 0, 255);
+ *p++ = CLAMP ((int) (((32768 * r) >> 16) - ((27439 * g) >> 16) -
+ ((5329 * b) >> 16) + 128), 0, 255);
+ }
+ }
+}
+
+static void
+gst_text_renderer_image_to_argb (GstTextRender * render, guchar * pixbuf,
+ int xpos, int ypos, int stride)
+{
+ int i, j;
+ guchar *p, *bitp;
+ int width, height;
+
+ width = render->image_width;
+ height = render->image_height;
+ bitp = render->text_image;
+
+ for (i = 0; i < height; i++) {
+ p = pixbuf + (ypos + i) * stride + xpos * 4;
+ for (j = 0; j < width; j++) {
+ p[0] = bitp[CAIRO_ARGB_A];
+ p[1] = bitp[CAIRO_ARGB_R];
+ p[2] = bitp[CAIRO_ARGB_G];
+ p[3] = bitp[CAIRO_ARGB_B];
+
+ /* Cairo uses pre-multiplied ARGB, unpremultiply it */
+ CAIRO_UNPREMULTIPLY (p[0], p[1], p[2], p[3]);
+
+ bitp += 4;
+ p += 4;
+ }
+ }
+}
+
+static GstFlowReturn
+gst_text_render_chain (GstPad * pad, GstBuffer * inbuf)
+{
+ GstTextRender *render;
+ GstFlowReturn ret;
+ GstBuffer *outbuf;
+ GstCaps *caps = NULL;
+ guint8 *data = GST_BUFFER_DATA (inbuf);
+ guint size = GST_BUFFER_SIZE (inbuf);
+ gint n;
+ gint xpos, ypos;
+
+ render = GST_TEXT_RENDER (gst_pad_get_parent (pad));
+
+ /* somehow pango barfs over "\0" buffers... */
+ while (size > 0 &&
+ (data[size - 1] == '\r' ||
+ data[size - 1] == '\n' || data[size - 1] == '\0')) {
+ size--;
+ }
+
+ /* render text */
+ GST_DEBUG ("rendering '%*s'", size, data);
+ pango_layout_set_markup (render->layout, (gchar *) data, size);
+ gst_text_render_render_pangocairo (render);
+
+ gst_text_render_check_argb (render);
+
+ if (!render->use_ARGB) {
+ caps =
+ gst_video_format_new_caps (GST_VIDEO_FORMAT_AYUV, render->width,
+ render->height, 1, 1, 1, 1);
+ } else {
+ caps =
+ gst_video_format_new_caps (GST_VIDEO_FORMAT_ARGB, render->width,
+ render->height, 1, 1, 1, 1);
+ }
+
+ if (!gst_pad_set_caps (render->srcpad, caps)) {
+ gst_caps_unref (caps);
+ GST_ELEMENT_ERROR (render, CORE, NEGOTIATION, (NULL), (NULL));
+ ret = GST_FLOW_ERROR;
+ goto done;
+ }
+
+ GST_DEBUG ("Allocating buffer WxH = %dx%d", render->width, render->height);
+ ret =
+ gst_pad_alloc_buffer_and_set_caps (render->srcpad, GST_BUFFER_OFFSET_NONE,
+ render->width * render->height * 4, caps, &outbuf);
+
+ if (ret != GST_FLOW_OK)
+ goto done;
+
+ gst_buffer_copy_metadata (outbuf, inbuf, GST_BUFFER_COPY_TIMESTAMPS);
+ data = GST_BUFFER_DATA (outbuf);
+
+ if (render->use_ARGB) {
+ memset (data, 0, render->width * render->height * 4);
+ } else {
+ for (n = 0; n < render->width * render->height; n++) {
+ data[n * 4] = data[n * 4 + 1] = 0;
+ data[n * 4 + 2] = data[n * 4 + 3] = 128;
+ }
+ }
+
+ switch (render->halign) {
+ case GST_TEXT_RENDER_HALIGN_LEFT:
+ xpos = render->xpad;
+ break;
+ case GST_TEXT_RENDER_HALIGN_CENTER:
+ xpos = (render->width - render->image_width) / 2;
+ break;
+ case GST_TEXT_RENDER_HALIGN_RIGHT:
+ xpos = render->width - render->image_width - render->xpad;
+ break;
+ default:
+ xpos = 0;
+ }
+
+ switch (render->valign) {
+ case GST_TEXT_RENDER_VALIGN_BOTTOM:
+ ypos = render->height - render->image_height - render->ypad;
+ break;
+ case GST_TEXT_RENDER_VALIGN_BASELINE:
+ ypos = render->height - (render->image_height + render->ypad);
+ break;
+ case GST_TEXT_RENDER_VALIGN_TOP:
+ ypos = render->ypad;
+ break;
+ default:
+ ypos = render->ypad;
+ break;
+ }
+
+ if (render->text_image) {
+ if (render->use_ARGB) {
+ gst_text_renderer_image_to_argb (render, data, xpos, ypos,
+ render->width * 4);
+ } else {
+ gst_text_renderer_image_to_ayuv (render, data, xpos, ypos,
+ render->width * 4);
+ }
+ }
+
+ ret = gst_pad_push (render->srcpad, outbuf);
+
+done:
+ if (caps)
+ gst_caps_unref (caps);
+ gst_buffer_unref (inbuf);
+ gst_object_unref (render);
+ return ret;
+}
+
+static void
+gst_text_render_finalize (GObject * object)
+{
+ GstTextRender *render = GST_TEXT_RENDER (object);
+
+ g_free (render->text_image);
+
+ if (render->layout)
+ g_object_unref (render->layout);
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gst_text_render_init (GstTextRender * render, GstTextRenderClass * klass)
+{
+ GstPadTemplate *template;
+
+ /* sink */
+ template = gst_static_pad_template_get (&sink_template_factory);
+ render->sinkpad = gst_pad_new_from_template (template, "sink");
+ gst_object_unref (template);
+ gst_pad_set_chain_function (render->sinkpad,
+ GST_DEBUG_FUNCPTR (gst_text_render_chain));
+ gst_element_add_pad (GST_ELEMENT (render), render->sinkpad);
+
+ /* source */
+ template = gst_static_pad_template_get (&src_template_factory);
+ render->srcpad = gst_pad_new_from_template (template, "src");
+ gst_object_unref (template);
+ gst_pad_set_fixatecaps_function (render->srcpad,
+ GST_DEBUG_FUNCPTR (gst_text_render_fixate_caps));
+ gst_pad_set_setcaps_function (render->srcpad,
+ GST_DEBUG_FUNCPTR (gst_text_render_setcaps));
+
+ gst_element_add_pad (GST_ELEMENT (render), render->srcpad);
+
+ render->line_align = DEFAULT_PROP_LINE_ALIGNMENT;
+ render->layout =
+ pango_layout_new (GST_TEXT_RENDER_GET_CLASS (render)->pango_context);
+ pango_layout_set_alignment (render->layout,
+ (PangoAlignment) render->line_align);
+
+ render->halign = DEFAULT_PROP_HALIGNMENT;
+ render->valign = DEFAULT_PROP_VALIGNMENT;
+ render->xpad = DEFAULT_PROP_XPAD;
+ render->ypad = DEFAULT_PROP_YPAD;
+
+ render->width = DEFAULT_RENDER_WIDTH;
+ render->height = DEFAULT_RENDER_HEIGHT;
+
+ render->use_ARGB = FALSE;
+}
+
+static void
+gst_text_render_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * pspec)
+{
+ GstTextRender *render = GST_TEXT_RENDER (object);
+
+ switch (prop_id) {
+ case PROP_VALIGNMENT:
+ render->valign = g_value_get_enum (value);
+ break;
+ case PROP_HALIGNMENT:
+ render->halign = g_value_get_enum (value);
+ break;
+ case PROP_LINE_ALIGNMENT:
+ render->line_align = g_value_get_enum (value);
+ pango_layout_set_alignment (render->layout,
+ (PangoAlignment) render->line_align);
+ break;
+ case PROP_XPAD:
+ render->xpad = g_value_get_int (value);
+ break;
+ case PROP_YPAD:
+ render->ypad = g_value_get_int (value);
+ break;
+ case PROP_FONT_DESC:
+ {
+ PangoFontDescription *desc;
+
+ desc = pango_font_description_from_string (g_value_get_string (value));
+ if (desc) {
+ GST_LOG ("font description set: %s", g_value_get_string (value));
+ GST_OBJECT_LOCK (render);
+ pango_layout_set_font_description (render->layout, desc);
+ gst_text_render_adjust_values_with_fontdesc (render, desc);
+ pango_font_description_free (desc);
+ gst_text_render_render_pangocairo (render);
+ GST_OBJECT_UNLOCK (render);
+ } else {
+ GST_WARNING ("font description parse failed: %s",
+ g_value_get_string (value));
+ }
+ break;
+ }
+
+ default:
+ break;
+ }
+}
+
+static void
+gst_text_render_get_property (GObject * object, guint prop_id,
+ GValue * value, GParamSpec * pspec)
+{
+ GstTextRender *render = GST_TEXT_RENDER (object);
+
+ switch (prop_id) {
+ case PROP_VALIGNMENT:
+ g_value_set_enum (value, render->valign);
+ break;
+ case PROP_HALIGNMENT:
+ g_value_set_enum (value, render->halign);
+ break;
+ case PROP_LINE_ALIGNMENT:
+ g_value_set_enum (value, render->line_align);
+ break;
+ case PROP_XPAD:
+ g_value_set_int (value, render->xpad);
+ break;
+ case PROP_YPAD:
+ g_value_set_int (value, render->ypad);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
projects / mafwsubrenderer / blobdiff