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128 lines
3.5 KiB
C
128 lines
3.5 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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void
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gst_videomixer_blend_bgra_bgra (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, b_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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src_stride = src_width * 4;
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dest_stride = dest_width * 4;
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b_alpha = (gint) (src_alpha * 255);
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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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src_add = src_stride - (4 * src_width);
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dest_add = dest_stride - (4 * src_width);
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dest = dest + 4 * xpos + (ypos * dest_stride);
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/* we convert a square of 2x2 samples to generate 4 Luma and 2 chroma samples */
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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[3] * b_alpha) >> 8;
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BLEND_MODE (dest[0], dest[1], dest[2], src[0], src[1], src[2],
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B, G, R, alpha);
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dest[0] = B;
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dest[1] = G;
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dest[2] = R;
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dest[3] = 0xff;
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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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#undef BLEND_MODE
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/* fill a buffer with a checkerboard pattern */
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void
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gst_videomixer_fill_bgra_checker (guint8 * dest, gint width, gint height)
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{
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gint i, j;
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static int tab[] = { 80, 160, 80, 160 };
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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++ = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)]; //blue
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*dest++ = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)]; //green
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*dest++ = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)]; //red
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*dest++ = 0xFF; //alpha
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}
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}
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}
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void
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gst_videomixer_fill_bgra_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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//check this conversion
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red = 1.164 * (colY - 16) + 1.596 * (colV - 128);
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green = 1.164 * (colY - 16) - 0.813 * (colV - 128) - 0.391 * (colU - 128);
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blue = 1.164 * (colY - 16) + 2.018 * (colU - 128);
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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++ = 0xff;
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*dest++ = colY;
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*dest++ = colU;
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*dest++ = colV;
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}
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}
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}
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