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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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video-blend: Add support for blending on top of 16 bit per component formats
With this we can support every currently supported video format for blending.
This commit is contained in:
Sebastian Dröge
GStreamer Merge Bot
parent
7f59cefafb
commit
0e74e190ad
2 changed files with 68 additions and 38 deletions
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@ -269,10 +269,10 @@ gst_video_blend_scale_linear_RGBA (GstVideoInfo * src, GstBuffer * src_buffer,
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#define OVER11(alphaG, alphaA, colorA, alphaB, colorB, alphaD) \
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((colorA * alphaG + colorB * (255 - alphaA)) / 255)
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#define BLENDC(op, global_alpha, aa, ca, ab, cb, dest_alpha) \
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#define BLENDC(op, max, global_alpha, aa, ca, ab, cb, dest_alpha) \
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G_STMT_START { \
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int c = op(global_alpha, aa, ca, ab, cb, dest_alpha); \
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cb = MIN(c, 255); \
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int c = op((global_alpha), (aa), (ca), (ab), (cb), (dest_alpha)); \
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cb = MIN(c, (max)); \
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} G_STMT_END
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@ -295,6 +295,7 @@ gst_video_blend (GstVideoFrame * dest,
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gint src_xoff = 0, src_yoff = 0;
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guint8 *tmpdestline = NULL, *tmpsrcline = NULL;
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gboolean src_premultiplied_alpha, dest_premultiplied_alpha;
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gint bpp;
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void (*matrix) (guint8 * tmpline, guint width);
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const GstVideoFormatInfo *sinfo, *dinfo, *dunpackinfo, *sunpackinfo;
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@ -339,11 +340,12 @@ gst_video_blend (GstVideoFrame * dest,
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g_assert (GST_VIDEO_FORMAT_INFO_BITS (sunpackinfo) == 8);
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if (GST_VIDEO_FORMAT_INFO_BITS (dunpackinfo) != 8)
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if (GST_VIDEO_FORMAT_INFO_BITS (dunpackinfo) != 8
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&& GST_VIDEO_FORMAT_INFO_BITS (dunpackinfo) != 16)
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goto unpack_format_not_supported;
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tmpdestline = g_malloc (sizeof (guint8) * (dest_width + 8) * 4);
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tmpsrcline = g_malloc (sizeof (guint8) * (src_width + 8) * 4);
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/* Source is always 8 bit but destination might be 8 or 16 bit */
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bpp = 4 * (GST_VIDEO_FORMAT_INFO_BITS (dunpackinfo) / 8);
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matrix = matrix_identity;
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if (GST_VIDEO_INFO_IS_RGB (&src->info) != GST_VIDEO_INFO_IS_RGB (&dest->info)) {
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@ -383,6 +385,9 @@ gst_video_blend (GstVideoFrame * dest,
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if (y + src_height > dest_height)
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src_height = dest_height - y;
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tmpsrcline = g_malloc (sizeof (guint8) * (src_width + 8) * 4);
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tmpdestline = g_malloc (sizeof (guint8) * (dest_width + 8) * bpp);
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/* Mainloop doing the needed conversions, and blending */
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for (i = y; i < y + src_height; i++, src_yoff++) {
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@ -392,58 +397,86 @@ gst_video_blend (GstVideoFrame * dest,
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src_xoff, src_yoff, src_width);
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/* FIXME: use the x parameter of the unpack func once implemented */
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tmpdestline += 4 * x;
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tmpdestline += bpp * x;
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matrix (tmpsrcline, src_width);
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#define BLENDLOOP(op, alpha_val) \
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#define BLENDLOOP(op, dest_type, max, shift, alpha_val) \
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G_STMT_START { \
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for (j = 0; j < src_width * 4; j += 4) { \
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guint8 asrc, adst; \
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gint final_alpha; \
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guint asrc, adst; \
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guint final_alpha; \
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dest_type * dest = (dest_type *) tmpdestline; \
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\
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asrc = tmpsrcline[j] * alpha_val / 255; \
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if (!asrc) \
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asrc = ((guint) tmpsrcline[j]) * alpha_val / 255; \
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asrc = asrc << shift; \
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if (asrc == 0) \
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continue; \
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\
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adst = tmpdestline[j]; \
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final_alpha = asrc + adst * (255 - asrc) / 255; \
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tmpdestline[j] = final_alpha; \
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adst = dest[j]; \
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final_alpha = asrc + adst * (max - asrc) / max; \
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dest[j] = final_alpha; \
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if (final_alpha == 0) \
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final_alpha = 1; \
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\
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BLENDC (op, alpha_val, asrc, tmpsrcline[j + 1], adst, tmpdestline[j + 1], final_alpha); \
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BLENDC (op, alpha_val, asrc, tmpsrcline[j + 2], adst, tmpdestline[j + 2], final_alpha); \
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BLENDC (op, alpha_val, asrc, tmpsrcline[j + 3], adst, tmpdestline[j + 3], final_alpha); \
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BLENDC (op, max, alpha_val, asrc, tmpsrcline[j + 1] << shift, adst, dest[j + 1], final_alpha); \
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BLENDC (op, max, alpha_val, asrc, tmpsrcline[j + 2] << shift, adst, dest[j + 2], final_alpha); \
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BLENDC (op, max, alpha_val, asrc, tmpsrcline[j + 3] << shift, adst, dest[j + 3], final_alpha); \
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} \
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} G_STMT_END
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if (G_LIKELY (global_alpha == 1.0)) {
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if (src_premultiplied_alpha && dest_premultiplied_alpha) {
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BLENDLOOP (OVER11, 255);
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} else if (!src_premultiplied_alpha && dest_premultiplied_alpha) {
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BLENDLOOP (OVER01, 255);
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} else if (src_premultiplied_alpha && !dest_premultiplied_alpha) {
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BLENDLOOP (OVER10, 255);
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if (bpp == 4) {
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if (G_LIKELY (global_alpha_val == 255)) {
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if (src_premultiplied_alpha && dest_premultiplied_alpha) {
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BLENDLOOP (OVER11, guint8, 255, 0, 255);
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} else if (!src_premultiplied_alpha && dest_premultiplied_alpha) {
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BLENDLOOP (OVER01, guint8, 255, 0, 255);
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} else if (src_premultiplied_alpha && !dest_premultiplied_alpha) {
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BLENDLOOP (OVER10, guint8, 255, 0, 255);
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} else {
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BLENDLOOP (OVER00, guint8, 255, 0, 255);
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}
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} else {
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BLENDLOOP (OVER00, 255);
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if (src_premultiplied_alpha && dest_premultiplied_alpha) {
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BLENDLOOP (OVER11, guint8, 255, 0, global_alpha_val);
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} else if (!src_premultiplied_alpha && dest_premultiplied_alpha) {
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BLENDLOOP (OVER01, guint8, 255, 0, global_alpha_val);
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} else if (src_premultiplied_alpha && !dest_premultiplied_alpha) {
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BLENDLOOP (OVER10, guint8, 255, 0, global_alpha_val);
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} else {
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BLENDLOOP (OVER00, guint8, 255, 0, global_alpha_val);
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}
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}
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} else {
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if (src_premultiplied_alpha && dest_premultiplied_alpha) {
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BLENDLOOP (OVER11, global_alpha_val);
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} else if (!src_premultiplied_alpha && dest_premultiplied_alpha) {
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BLENDLOOP (OVER01, global_alpha_val);
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} else if (src_premultiplied_alpha && !dest_premultiplied_alpha) {
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BLENDLOOP (OVER10, global_alpha_val);
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g_assert (bpp == 8);
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if (G_LIKELY (global_alpha_val == 255)) {
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if (src_premultiplied_alpha && dest_premultiplied_alpha) {
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BLENDLOOP (OVER11, guint16, 65535, 8, 255);
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} else if (!src_premultiplied_alpha && dest_premultiplied_alpha) {
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BLENDLOOP (OVER01, guint16, 65535, 8, 255);
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} else if (src_premultiplied_alpha && !dest_premultiplied_alpha) {
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BLENDLOOP (OVER10, guint16, 65535, 8, 255);
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} else {
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BLENDLOOP (OVER00, guint16, 65535, 8, 255);
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}
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} else {
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BLENDLOOP (OVER00, global_alpha_val);
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if (src_premultiplied_alpha && dest_premultiplied_alpha) {
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BLENDLOOP (OVER11, guint16, 65535, 8, global_alpha_val);
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} else if (!src_premultiplied_alpha && dest_premultiplied_alpha) {
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BLENDLOOP (OVER01, guint16, 65535, 8, global_alpha_val);
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} else if (src_premultiplied_alpha && !dest_premultiplied_alpha) {
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BLENDLOOP (OVER10, guint16, 65535, 8, global_alpha_val);
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} else {
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BLENDLOOP (OVER00, guint16, 65535, 8, global_alpha_val);
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}
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}
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}
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#undef BLENDLOOP
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/* undo previous pointer adjustments to pass right pointer to g_free */
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tmpdestline -= 4 * x;
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tmpdestline -= bpp * x;
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/* FIXME
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* #if G_BYTE_ORDER == LITTLE_ENDIAN
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@ -119,10 +119,7 @@ typedef enum {
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*
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* Since: 1.2
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*/
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#define GST_VIDEO_OVERLAY_COMPOSITION_BLEND_FORMATS \
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"{ BGRx, RGBx, xRGB, xBGR, RGBA, BGRA, ARGB, ABGR, RGB, BGR," \
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" I420, YV12, AYUV, YUY2, UYVY, v308, Y41B, Y42B, Y444," \
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" NV12, NV21, A420, YUV9, YVU9, IYU1, GRAY8 }"
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#define GST_VIDEO_OVERLAY_COMPOSITION_BLEND_FORMATS GST_VIDEO_FORMATS_ALL
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GST_VIDEO_API
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GType gst_video_overlay_rectangle_get_type (void);
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