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gst/alpha/gstalpha.c: Fix stride issues. Does not completely work for odd heights.

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Original commit message from CVS:
* gst/alpha/gstalpha.c: (gst_alpha_method_get_type),
(gst_alpha_chroma_key), (gst_alpha_chain):
Fix stride issues. Does not completely work for odd
heights.
This commit is contained in:
Wim Taymans 2004-11-03 18:54:50 +00:00
parent 20f699aeef
commit 42b6135b3e
2 changed files with 64 additions and 15 deletions
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7
ChangeLog
View file

@ -1,3 +1,10 @@
2004-11-03 Wim Taymans <wim@fluendo.com>
* gst/alpha/gstalpha.c: (gst_alpha_method_get_type),
(gst_alpha_chroma_key), (gst_alpha_chain):
Fix stride issues. Does not completely work for odd
heights.
2004-11-03 Christophe Fergeau <teuf@gnome.org>
* gst/videoscale/gstvideoscale.c: (gst_videoscale_getcaps):

72
gst/alpha/gstalpha.c
View file

@ -44,6 +44,7 @@ typedef enum
ALPHA_METHOD_ADD,
ALPHA_METHOD_GREEN,
ALPHA_METHOD_BLUE,
ALPHA_METHOD_BLACK,
}
GstAlphaMethod;
@ -143,6 +144,7 @@ gst_alpha_method_get_type (void)
{ALPHA_METHOD_ADD, "0", "Add alpha channel"},
{ALPHA_METHOD_GREEN, "1", "Chroma Key green"},
{ALPHA_METHOD_BLUE, "2", "Chroma Key blue"},
{ALPHA_METHOD_BLACK, "3", "Chroma Key black"},
{0, NULL, NULL},
};
@ -327,6 +329,8 @@ static int yuv_colors_U[] = { 128, 46, 255 };
static int yuv_colors_V[] = { 128, 21, 107 };
*/
#define ROUND_UP_4(x) (((x) + 3) & ~3)
static void
gst_alpha_add (guint8 * src, guint8 * dest, gint width, gint height,
gdouble alpha)
@ -335,15 +339,25 @@ gst_alpha_add (guint8 * src, guint8 * dest, gint width, gint height,
guint8 *srcY;
guint8 *srcU;
guint8 *srcV;
gint size;
gint half_width = width / 2;
gint i, j;
gint w2, h2;
gint size, size2;
gint stride, stride2;
gint wrap, wrap2;
size = width * height;
stride = ROUND_UP_4 (width);
size = stride * height;
w2 = (width + 1) >> 1;
stride2 = ROUND_UP_4 (w2);
h2 = (height + 1) >> 1;
size2 = stride2 * h2;
wrap = stride - 2 * (width / 2);
wrap2 = stride2 - width / 2;
srcY = src;
srcU = srcY + size;
srcV = srcU + size / 4;
srcV = srcU + size2;
for (i = 0; i < height; i++) {
for (j = 0; j < width / 2; j++) {
@ -357,12 +371,19 @@ gst_alpha_add (guint8 * src, guint8 * dest, gint width, gint height,
*dest++ = *srcV++;
}
if (i % 2 == 0) {
srcU -= half_width;
srcV -= half_width;
srcU -= width / 2;
srcV -= width / 2;
} else {
srcU += wrap2;
srcV += wrap2;
}
srcY += wrap;
}
}
#define ROUND_UP_4(x) (((x) + 3) & ~3)
#define ROUND_UP_2(x) (((x) + 1) & ~1)
static void
gst_alpha_chroma_key (gchar * src, gchar * dest, gint width, gint height,
gboolean soft, gint target_u, gint target_v, gfloat edge_factor,
@ -374,18 +395,30 @@ gst_alpha_chroma_key (gchar * src, gchar * dest, gint width, gint height,
guint8 *dest1, *dest2;
gint i, j;
gint x, z, u, v;
gint size;
gint w2, h2;
gint size, size2;
gint stride, stride2;
gint wrap, wrap2, wrap3;
size = width * height;
stride = ROUND_UP_4 (width);
size = stride * height;
w2 = (width + 1) >> 1;
stride2 = ROUND_UP_4 (w2);
h2 = (height + 1) >> 1;
size2 = stride2 * h2;
srcY1 = src;
srcY2 = src + width;
srcY2 = src + stride;
srcU = srcY1 + size;
srcV = srcU + size / 4;
srcV = srcU + size2;
dest1 = dest;
dest2 = dest + width * 4;
wrap = 2 * stride - 2 * (width / 2);
wrap2 = stride2 - width / 2;
wrap3 = 8 * width - 8 * (ROUND_UP_2 (width) / 2);
for (i = 0; i < height / 2; i++) {
for (j = 0; j < width / 2; j++) {
u = *srcU++;
@ -440,10 +473,12 @@ gst_alpha_chroma_key (gchar * src, gchar * dest, gint width, gint height,
*dest2++ = u;
*dest2++ = v;
}
dest1 += width * 4;
dest2 += width * 4;
srcY1 += width;
srcY2 += width;
dest1 += wrap3;
dest2 += wrap3;
srcY1 += wrap;
srcY2 += wrap;
srcU += wrap2;
srcV += wrap2;
}
}
@ -504,13 +539,20 @@ gst_alpha_chain (GstPad * pad, GstData * _data)
gst_alpha_chroma_key (GST_BUFFER_DATA (buffer),
GST_BUFFER_DATA (outbuf),
new_width, new_height,
TRUE, alpha->target_cr, alpha->target_cb, 1.0, alpha->alpha);
FALSE, alpha->target_cr, alpha->target_cb, 1.0, alpha->alpha);
break;
case ALPHA_METHOD_BLUE:
gst_alpha_chroma_key (GST_BUFFER_DATA (buffer),
GST_BUFFER_DATA (outbuf),
new_width, new_height, TRUE, 100, 100, 1.0, alpha->alpha);
break;
case ALPHA_METHOD_BLACK:
gst_alpha_chroma_key (GST_BUFFER_DATA (buffer),
GST_BUFFER_DATA (outbuf),
new_width, new_height, TRUE, 129, 129, 1.0, alpha->alpha);
break;
default:
break;
}
gst_buffer_unref (buffer);