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134 lines
3.9 KiB
C
134 lines
3.9 KiB
C
/*
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* Copyright (C) 2009 Alex Ugarte <augarte@vicomtech.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <gst/gst.h>
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#define BLEND_NORMAL(B1,G1,R1,B2,G2,R2,B,G,R,alpha) \
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B = ((B1*(255-alpha))+(B2*alpha))>>8; \
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G = ((G1*(255-alpha))+(G2*alpha))>>8; \
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R = ((R1*(255-alpha))+(R2*alpha))>>8;
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#define BLEND_MODE BLEND_NORMAL
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#define CREATE_FUNCTIONS(name, a, r, g, b) \
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void \
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gst_videomixer_blend_##name##_##name (guint8 * src, gint xpos, gint ypos, \
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gint src_width, gint src_height, gdouble src_alpha, \
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guint8 * dest, gint dest_width, gint dest_height) \
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{ \
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gint alpha, s_alpha; \
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gint i, j; \
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gint src_stride, dest_stride; \
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gint src_add, dest_add; \
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gint B, G, R; \
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\
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src_stride = src_width * 4; \
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dest_stride = dest_width * 4; \
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\
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s_alpha = CLAMP ((gint) (src_alpha * 256), 0, 256); \
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\
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/* adjust src pointers for negative sizes */ \
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if (xpos < 0) { \
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src += -xpos * 4; \
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src_width -= -xpos; \
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xpos = 0; \
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} \
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if (ypos < 0) { \
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src += -ypos * src_stride; \
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src_height -= -ypos; \
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ypos = 0; \
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} \
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/* adjust width/height if the src is bigger than dest */ \
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if (xpos + src_width > dest_width) { \
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src_width = dest_width - xpos; \
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} \
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if (ypos + src_height > dest_height) { \
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src_height = dest_height - ypos; \
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} \
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\
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src_add = src_stride - (4 * src_width); \
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dest_add = dest_stride - (4 * src_width); \
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\
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dest = dest + 4 * xpos + (ypos * dest_stride); \
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\
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for (i = 0; i < src_height; i++) { \
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for (j = 0; j < src_width; j++) { \
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alpha = (src[a] * s_alpha) >> 8; \
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BLEND_MODE (dest[b], dest[g], dest[r], src[b], src[g], src[r], \
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B, G, R, alpha); \
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dest[b] = B; \
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dest[g] = G; \
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dest[r] = R; \
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dest[a] = 0xff; \
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\
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src += 4; \
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dest += 4; \
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} \
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src += src_add; \
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dest += dest_add; \
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} \
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} \
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\
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/* fill a buffer with a checkerboard pattern */ \
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void \
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gst_videomixer_fill_##name##_checker (guint8 * dest, gint width, gint height) \
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{ \
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gint i, j; \
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static const int tab[] = { 80, 160, 80, 160 }; \
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\
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for (i = 0; i < height; i++) { \
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for (j = 0; j < width; j++) { \
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dest[b] = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)]; /* blue */ \
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dest[g] = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)]; /* green */ \
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dest[r] = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)]; /* red */ \
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dest[a] = 0xFF; /* alpha */ \
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dest += 4; \
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} \
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} \
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} \
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\
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void \
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gst_videomixer_fill_##name##_color (guint8 * dest, gint width, gint height, \
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gint colY, gint colU, gint colV) \
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{ \
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gint red, green, blue; \
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gint i, j; \
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\
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red = CLAMP (1.164 * (colY - 16) + 1.596 * (colV - 128), 0, 255); \
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green = \
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CLAMP (1.164 * (colY - 16) - 0.813 * (colV - 128) - 0.391 * (colU - 128), \
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0, 255); \
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blue = CLAMP (1.164 * (colY - 16) + 2.018 * (colU - 128), 0, 255); \
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\
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for (i = 0; i < height; i++) { \
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for (j = 0; j < width; j++) { \
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dest[b] = blue; \
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dest[g] = green; \
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dest[r] = red; \
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dest[a] = 0xff; \
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dest += 4; \
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} \
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} \
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}
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CREATE_FUNCTIONS (argb, 0, 1, 2, 3);
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CREATE_FUNCTIONS (bgra, 3, 2, 1, 0);
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#undef BLEND_MODE
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