diff options
Diffstat (limited to 'gst/videomixer/blend_ayuv.c')
-rw-r--r-- | gst/videomixer/blend_ayuv.c | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/gst/videomixer/blend_ayuv.c b/gst/videomixer/blend_ayuv.c new file mode 100644 index 00000000..a3c212db --- /dev/null +++ b/gst/videomixer/blend_ayuv.c @@ -0,0 +1,270 @@ +/* + * Copyright (C) 2004 Wim Taymans <wim@fluendo.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. + */ + + +#include <gst/gst.h> + +#define BLEND_NORMAL(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ + Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \ + U = ((U1*(255-alpha))+(U2*alpha))>>8; \ + V = ((V1*(255-alpha))+(V2*alpha))>>8; + +#define BLEND_ADD(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ + Y = Y1+((Y2*alpha)>>8); \ + U = U1+(((127*(255-alpha)+(U2*alpha)))>>8)-127; \ + V = V1+(((127*(255-alpha)+(V2*alpha)))>>8)-127; \ + if (Y>255) { \ + gint mult = MAX (0, 288-Y); \ + U = ((U*mult) + (127*(32-mult)))>>5; \ + V = ((V*mult) + (127*(32-mult)))>>5; \ + Y = 255; \ + } \ + U = MIN (U,255); \ + V = MIN (V,255); + +#define BLEND_SUBTRACT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ + Y = Y1-((Y2*alpha)>>8); \ + U = U1+(((127*(255-alpha)+(U2*alpha)))>>8)-127; \ + V = V1+(((127*(255-alpha)+(V2*alpha)))>>8)-127; \ + if (Y<0) { \ + gint mult = MIN (32, -Y); \ + U = ((U*(32-mult)) + (127*mult))>>5; \ + V = ((V*(32-mult)) + (127*mult))>>5; \ + Y = 0; \ + } + +#define BLEND_DARKEN(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ + if (Y1 < Y2) { \ + Y = Y1; U = U1; V = V1; \ + } \ + else { \ + Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \ + U = ((U1*(255-alpha))+(U2*alpha))>>8; \ + V = ((V1*(255-alpha))+(V2*alpha))>>8; \ + } + +#define BLEND_LIGHTEN(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ + if (Y1 > Y2) { \ + Y = Y1; U = U1; V = V1; \ + } \ + else { \ + Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \ + U = ((U1*(255-alpha))+(U2*alpha))>>8; \ + V = ((V1*(255-alpha))+(V2*alpha))>>8; \ + } + +#define BLEND_MULTIPLY(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ + Y = (Y1*(256*(255-alpha) +(Y2*alpha)))>>16; \ + U = ((U1*(255-alpha)*256)+(alpha*(U1*Y2+128*(256-Y2))))>>16; \ + V = ((V1*(255-alpha)*256)+(alpha*(V1*Y2+128*(256-Y2))))>>16; + +#define BLEND_DIFFERENCE(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ + Y = ABS((gint)Y1-(gint)Y2)+127; \ + U = ABS((gint)U1-(gint)U2)+127; \ + V = ABS((gint)V1-(gint)V2)+127; \ + Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \ + U = ((U*alpha)+(U1*(255-alpha)))>>8; \ + V = ((V*alpha)+(V1*(255-alpha)))>>8; \ + if (Y>255) { \ + gint mult = MAX (0, 288-Y); \ + U = ((U*mult) + (127*(32-mult)))>>5; \ + V = ((V*mult) + (127*(32-mult)))>>5; \ + Y = 255; \ + } else if (Y<0) { \ + gint mult = MIN (32, -Y); \ + U = ((U*(32-mult)) + (127*mult))>>5; \ + V = ((V*(32-mult)) + (127*mult))>>5; \ + Y = 0; \ + } \ + U = CLAMP(U, 0, 255); \ + V = CLAMP(V, 0, 255); + +#define BLEND_EXCLUSION(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ + Y = ((gint)(Y1^0xff)*Y2+(gint)(Y2^0xff)*Y1)>>8; \ + U = ((gint)(U1^0xff)*Y2+(gint)(Y2^0xff)*U1)>>8; \ + V = ((gint)(V1^0xff)*Y2+(gint)(Y2^0xff)*V1)>>8; \ + Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \ + U = ((U*alpha)+(U1*(255-alpha)))>>8; \ + V = ((V*alpha)+(V1*(255-alpha)))>>8; \ + if (Y>255) { \ + gint mult = MAX (0, 288-Y); \ + U = ((U*mult) + (127*(32-mult)))>>5; \ + V = ((V*mult) + (127*(32-mult)))>>5; \ + Y = 255; \ + } else if (Y<0) { \ + gint mult = MIN (32, -Y); \ + U = ((U*(32-mult)) + (127*mult))>>5; \ + V = ((V*(32-mult)) + (127*mult))>>5; \ + Y = 0; \ + } \ + U = CLAMP(U, 0, 255); \ + V = CLAMP(V, 0, 255); + +#define BLEND_SOFTLIGHT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ + Y = (gint)Y1+(gint)Y2 - 127; \ + U = (gint)U1+(gint)U2 - 127; \ + V = (gint)V1+(gint)V2 - 127; \ + Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \ + U = ((U*alpha)+(U1*(255-alpha)))>>8; \ + V = ((V*alpha)+(V1*(255-alpha)))>>8; \ + if (Y>255) { \ + gint mult = MAX (0, 288-Y); \ + U = ((U*mult) + (127*(32-mult)))>>5; \ + V = ((V*mult) + (127*(32-mult)))>>5; \ + Y = 255; \ + } else if (Y<0) { \ + gint mult = MIN (32, -Y); \ + U = ((U*(32-mult)) + (127*mult))>>5; \ + V = ((V*(32-mult)) + (127*mult))>>5; \ + Y = 0; \ + } \ + +#define BLEND_HARDLIGHT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ + Y = (gint)Y1+(gint)Y2*2 - 255; \ + U = (gint)U1+(gint)U2 - 127; \ + V = (gint)V1+(gint)V2 - 127; \ + Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \ + U = ((U*alpha)+(U1*(255-alpha)))>>8; \ + V = ((V*alpha)+(V1*(255-alpha)))>>8; \ + if (Y>255) { \ + gint mult = MAX (0, 288-Y); \ + U = ((U*mult) + (127*(32-mult)))>>5; \ + V = ((V*mult) + (127*(32-mult)))>>5; \ + Y = 255; \ + } else if (Y<0) { \ + gint mult = MIN (32, -Y); \ + U = ((U*(32-mult)) + (127*mult))>>5; \ + V = ((V*(32-mult)) + (127*mult))>>5; \ + Y = 0; \ + } \ + +#define BLEND_MODE BLEND_NORMAL +#if 0 +#define BLEND_MODE BLEND_NORMAL +#define BLEND_MODE BLEND_ADD +#define BLEND_MODE BLEND_SUBTRACT +#define BLEND_MODE BLEND_LIGHTEN +#define BLEND_MODE BLEND_DARKEN +#define BLEND_MODE BLEND_MULTIPLY +#define BLEND_MODE BLEND_DIFFERENCE +#define BLEND_MODE BLEND_EXCLUSION +#define BLEND_MODE BLEND_SOFTLIGHT +#define BLEND_MODE BLEND_HARDLIGHT +#endif + +/* note that this function does packing conversion and blending at the + * same time */ +void +gst_videomixer_blend_ayuv_ayuv (guint8 * src, gint xpos, gint ypos, + gint src_width, gint src_height, gdouble src_alpha, + guint8 * dest, gint dest_width, gint dest_height) +{ + gint alpha, b_alpha; + + gint i, j; + + gint src_stride, dest_stride; + + gint src_add, dest_add; + + gint Y, U, V; + + src_stride = src_width * 4; + dest_stride = dest_width * 4; + + b_alpha = (gint) (src_alpha * 255); + + /* adjust src pointers for negative sizes */ + if (xpos < 0) { + src += -xpos * 4; + 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 - (4 * src_width); + dest_add = dest_stride - (4 * src_width); + + dest = dest + 4 * xpos + (ypos * dest_stride); + + /* 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++) { + alpha = (src[0] * b_alpha) >> 8; + BLEND_MODE (dest[1], dest[2], dest[3], src[1], src[2], src[3], + alpha, Y, U, V); + dest[0] = 0xff; + dest[1] = Y; + dest[2] = U; + dest[3] = V; + + src += 4; + dest += 4; + } + src += src_add; + dest += dest_add; + } +} + +#undef BLEND_MODE + + +/* fill a buffer with a checkerboard pattern */ +void +gst_videomixer_fill_ayuv_checker (guint8 * dest, gint width, gint height) +{ + gint i, j; + static int tab[] = { 80, 160, 80, 160 }; + + for (i = 0; i < height; i++) { + for (j = 0; j < width; j++) { + *dest++ = 0xff; + *dest++ = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)]; + *dest++ = 128; + *dest++ = 128; + } + } +} + +void +gst_videomixer_fill_ayuv_color (guint8 * dest, gint width, gint height, + gint colY, gint colU, gint colV) +{ + gint i, j; + + for (i = 0; i < height; i++) { + for (j = 0; j < width; j++) { + *dest++ = 0xff; + *dest++ = colY; + *dest++ = colU; + *dest++ = colV; + } + } +} |