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Diffstat (limited to 'gst/videomixer/blend_rgb.c')
| -rw-r--r-- | gst/videomixer/blend_rgb.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/gst/videomixer/blend_rgb.c b/gst/videomixer/blend_rgb.c new file mode 100644 index 000000000..b580081f9 --- /dev/null +++ b/gst/videomixer/blend_rgb.c @@ -0,0 +1,156 @@ +/* + * Copyright (C) 2009 Alex Ugarte <augarte@vicomtech.org> + * Copyright (C) 2009 Sebastian Dröge <sebastian.droege@collabora.co.uk> + * + * 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. + */ + + +#include <gst/gst.h> +#include <string.h> +#include "videomixer.h" + +#define BLEND_NORMAL(R1,G1,B1,R2,G2,B2,alpha,R,G,B) \ + R = ((R1*(255-alpha))+(R2*alpha))>>8; \ + G = ((G1*(255-alpha))+(G2*alpha))>>8; \ + B = ((B1*(255-alpha))+(B2*alpha))>>8; + +#define BLEND_MODE BLEND_NORMAL + +#define CREATE_FUNCTIONS(name, bpp, r, g, b) \ +void \ +gst_videomixer_blend_##name##_##name (guint8 * src, gint xpos, gint ypos, \ + gint src_width, gint src_height, gdouble src_alpha, \ + guint8 * dest, gint dest_width, gint dest_height) \ +{ \ + gint b_alpha; \ + gint i, j; \ + gint src_stride, dest_stride; \ + gint src_add, dest_add; \ + gint R, G, B; \ + \ + src_stride = GST_ROUND_UP_4 (src_width * bpp); \ + dest_stride = GST_ROUND_UP_4 (dest_width * bpp); \ + \ + b_alpha = (gint) (src_alpha * 255); \ + \ + /* adjust src pointers for negative sizes */ \ + if (xpos < 0) { \ + src += -xpos * bpp; \ + src_width -= -xpos; \ + xpos = 0; \ + } \ + if (ypos < 0) { \ + src += -ypos * src_stride; \ + src_height -= -ypos; \ + ypos = 0; \ + } \ + /* adjust width/height if the src is bigger than dest */ \ + if (xpos + src_width > dest_width) { \ + src_width = dest_width - xpos; \ + } \ + if (ypos + src_height > dest_height) { \ + src_height = dest_height - ypos; \ + } \ + \ + src_add = src_stride - (bpp * src_width); \ + dest_add = dest_stride - (bpp * src_width); \ + \ + dest = dest + bpp * xpos + (ypos * dest_stride); \ + /* If it's completely transparent... we just return */ \ + if (G_UNLIKELY (src_alpha == 0.0)) { \ + GST_INFO ("Fast copy (alpha == 0.0)"); \ + return; \ + } \ + \ + /* If it's completely opaque, we do a fast copy */ \ + if (G_UNLIKELY (src_alpha == 1.0)) { \ + GST_INFO ("Fast copy (alpha == 1.0)"); \ + for (i = 0; i < src_height; i++) { \ + memcpy (dest, src, bpp * src_width); \ + src += src_stride; \ + dest += dest_stride; \ + } \ + return; \ + } \ + \ + /* we convert a square of 2x2 samples to generate 4 Luma and 2 chroma samples */ \ + for (i = 0; i < src_height; i++) { \ + for (j = 0; j < src_width; j++) { \ + BLEND_MODE (dest[r], dest[g], dest[b], src[r], src[g], src[b], \ + b_alpha, R, G, B); \ + dest[r] = R; \ + dest[g] = G; \ + dest[b] = B; \ + \ + src += bpp; \ + dest += bpp; \ + } \ + src += src_add; \ + dest += dest_add; \ + } \ +} \ +\ +/* fill a buffer with a checkerboard pattern */ \ +void \ +gst_videomixer_fill_##name##_checker (guint8 * dest, gint width, gint height) \ +{ \ + gint i, j; \ + static const int tab[] = { 80, 160, 80, 160 }; \ + gint dest_add = GST_ROUND_UP_4 (width * bpp) - width * bpp; \ + \ + for (i = 0; i < height; i++) { \ + for (j = 0; j < width; j++) { \ + dest[r] = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)]; /* red */ \ + dest[g] = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)]; /* green */ \ + dest[b] = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)]; /* blue */ \ + dest += bpp; \ + } \ + dest += dest_add; \ + } \ +} \ +\ +void \ +gst_videomixer_fill_##name##_color (guint8 * dest, gint width, gint height, \ + gint colY, gint colU, gint colV) \ +{ \ + gint red, green, blue; \ + gint i, j; \ + gint dest_add = GST_ROUND_UP_4 (width * bpp) - width * bpp; \ + \ + red = CLAMP (1.164 * (colY - 16) + 1.596 * (colV - 128), 0, 255); \ + green = \ + CLAMP (1.164 * (colY - 16) - 0.813 * (colV - 128) - 0.391 * (colU - 128), \ + 0, 255); \ + blue = CLAMP (1.164 * (colY - 16) + 2.018 * (colU - 128), 0, 255); \ + \ + for (i = 0; i < height; i++) { \ + for (j = 0; j < width; j++) { \ + dest[r] = red; \ + dest[g] = green; \ + dest[b] = blue; \ + dest += bpp; \ + } \ + dest += dest_add; \ + } \ +} + +CREATE_FUNCTIONS (rgb, 3, 0, 1, 2); +CREATE_FUNCTIONS (bgr, 3, 2, 1, 0); +CREATE_FUNCTIONS (xrgb, 4, 1, 2, 3); +CREATE_FUNCTIONS (xbgr, 4, 3, 2, 1); +CREATE_FUNCTIONS (rgbx, 4, 0, 1, 2); +CREATE_FUNCTIONS (bgrx, 4, 2, 1, 0); |