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ttmlrender: add facility to stitch images in both directions

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https://bugzilla.gnome.org/show_bug.cgi?id=780402
This commit is contained in:
Chris Bass 2017-03-21 15:05:18 +00:00 committed by Sebastian Dröge
parent ce532ddcfd
commit 2a4a18b2ab
1 changed files with 66 additions and 23 deletions
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89
ext/ttml/gstttmlrender.c
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@ -94,6 +94,13 @@ GST_STATIC_PAD_TEMPLATE ("text_sink",
#define GST_TTML_RENDER_BROADCAST(ov)(g_cond_broadcast (GST_TTML_RENDER_GET_COND (ov)))
typedef enum
{
GST_TTML_DIRECTION_INLINE,
GST_TTML_DIRECTION_BLOCK
} GstTtmlDirection;
typedef struct
{
guint height;
@ -149,6 +156,8 @@ static GstTtmlRenderRenderedImage *gst_ttml_render_rendered_image_copy
(GstTtmlRenderRenderedImage * image);
static void gst_ttml_render_rendered_image_free
(GstTtmlRenderRenderedImage * image);
static GstTtmlRenderRenderedImage *gst_ttml_render_stitch_images (GPtrArray *
images, GstTtmlDirection direction);
GType
gst_ttml_render_get_type (void)
@ -2044,30 +2053,61 @@ gst_ttml_render_get_alignment (GstSubtitleStyleSet * style_set)
}
/*
* Overlays a set of rendered images to return a single image. Order is
* significant: later entries in @images are rendered on top of earlier
* entries.
*/
static GstTtmlRenderRenderedImage *
gst_ttml_render_stitch_blocks (GList * blocks)
gst_ttml_render_overlay_images (GPtrArray * images)
{
guint vert_offset = 0;
GList *block_entry;
GstTtmlRenderRenderedImage *ret = NULL;
gint i;
for (block_entry = g_list_first (blocks); block_entry;
block_entry = block_entry->next) {
GstTtmlRenderRenderedImage *block, *tmp;
block = (GstTtmlRenderRenderedImage *) block_entry->data;
tmp = ret;
block->y += vert_offset;
GST_CAT_LOG (ttmlrender_debug, "Rendering block at vertical offset %u",
vert_offset);
vert_offset = block->y + block->height;
ret = gst_ttml_render_rendered_image_combine (ret, block);
if (tmp)
gst_ttml_render_rendered_image_free (tmp);
for (i = 0; i < images->len; ++i) {
GstTtmlRenderRenderedImage *tmp = ret;
ret = gst_ttml_render_rendered_image_combine (ret,
g_ptr_array_index (images, i));
gst_ttml_render_rendered_image_free (tmp);
}
return ret;
}
/*
* Takes a set of images and renders them as a single image, where all the
* images are arranged contiguously in the direction given by @direction. Note
* that the positions of the images in @images will be altered.
*/
static GstTtmlRenderRenderedImage *
gst_ttml_render_stitch_images (GPtrArray * images, GstTtmlDirection direction)
{
guint cur_offset = 0;
GstTtmlRenderRenderedImage *ret = NULL;
gint i;
for (i = 0; i < images->len; ++i) {
GstTtmlRenderRenderedImage *block;
block = g_ptr_array_index (images, i);
if (direction == GST_TTML_DIRECTION_BLOCK) {
block->y += cur_offset;
cur_offset = block->y + block->height;
} else {
block->x += cur_offset;
cur_offset = block->x + block->width;
}
}
ret = gst_ttml_render_overlay_images (images);
if (ret) {
GST_CAT_LOG (ttmlrender_debug, "Height of stitched image: %u", ret->height);
if (direction == GST_TTML_DIRECTION_BLOCK)
GST_CAT_LOG (ttmlrender_debug, "Height of stitched image: %u",
ret->height);
else
GST_CAT_LOG (ttmlrender_debug, "Width of stitched image: %u", ret->width);
ret->image = gst_buffer_make_writable (ret->image);
}
return ret;
@ -2194,10 +2234,12 @@ static GstVideoOverlayComposition *
gst_ttml_render_render_text_region (GstTtmlRender * render,
GstSubtitleRegion * region, GstBuffer * text_buf)
{
GList *blocks = NULL;
guint region_x, region_y, region_width, region_height;
guint window_x, window_y, window_width, window_height;
guint padding_start, padding_end, padding_before, padding_after;
GPtrArray *rendered_blocks =
g_ptr_array_new_with_free_func (
(GDestroyNotify) gst_ttml_render_rendered_image_free);
GstTtmlRenderRenderedImage *region_image = NULL;
GstTtmlRenderRenderedImage *blocks_image;
GstVideoOverlayComposition *ret = NULL;
@ -2249,15 +2291,14 @@ gst_ttml_render_render_text_region (GstTtmlRender * render,
rendered_block = gst_ttml_render_render_text_block (render, block, text_buf,
window_width, TRUE);
blocks = g_list_append (blocks, rendered_block);
g_ptr_array_add (rendered_blocks, rendered_block);
}
if (blocks) {
if (rendered_blocks->len > 0) {
GstTtmlRenderRenderedImage *tmp;
blocks_image = gst_ttml_render_stitch_blocks (blocks);
g_list_free_full (blocks,
(GDestroyNotify) gst_ttml_render_rendered_image_free);
blocks_image = gst_ttml_render_stitch_images (rendered_blocks,
GST_TTML_DIRECTION_BLOCK);
blocks_image->x += window_x;
switch (region->style_set->display_align) {
@ -2303,6 +2344,8 @@ gst_ttml_render_render_text_region (GstTtmlRender * render,
ret = gst_ttml_render_compose_overlay (region_image);
gst_ttml_render_rendered_image_free (region_image);
}
g_ptr_array_unref (rendered_blocks);
return ret;
}