mirror of
https://github.com/mpv-player/mpv
synced 2024-12-25 16:33:02 +00:00
6dd4fcd209
prowess; also added link to algorithm description in Roberto's RPZA decoder git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@4648 b3059339-0415-0410-9bf9-f77b7e298cf2
265 lines
6.9 KiB
C
265 lines
6.9 KiB
C
/*
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*
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* Apple Video (rpza) QuickTime Decoder for Mplayer
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* (c) 2002 Roberto Togni
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*
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* Fourcc: rpza, azpr
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*
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* Some code comes from qtsmc.c by Mike Melanson
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*
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* A description of the decoding algorithm can be found here:
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* http://www.pcisys.net/~melanson/codecs/
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*/
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#include "config.h"
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#include "bswap.h"
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#include "mp_msg.h"
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#define BE_16(x) (be2me_16(*(unsigned short *)(x)))
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#define BE_32(x) (be2me_32(*(unsigned int *)(x)))
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#define ADVANCE_BLOCK() \
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{ \
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pixel_ptr += block_x_inc; \
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if (pixel_ptr >= (width * bytes_per_pixel)) \
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{ \
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pixel_ptr = 0; \
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row_ptr += block_y_inc * 4; \
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} \
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total_blocks--; \
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if (total_blocks < 0) \
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{ \
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mp_msg(MSGT_DECVIDEO, MSGL_WARN, "block counter just went negative (this should not happen)\n"); \
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return; \
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} \
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}
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#define PAINT_CURRENT_PIXEL(r, g, b, color) \
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{ \
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if (bytes_per_pixel == 2) { \
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(*(unsigned short*)(&decoded[block_ptr])) = color & 0x7fff; \
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block_ptr += 2; \
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} else { \
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decoded[block_ptr++] = (b); \
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decoded[block_ptr++] = (g); \
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decoded[block_ptr++] = (r); \
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if (bytes_per_pixel == 4) /* 32bpp */ \
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block_ptr++; \
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} \
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}
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#define COLOR_FIX(col_out, col_in) (col_out) = ((col_in) << 3) | ((col_in) >> 2)
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#define COLOR_TO_RGB(r, g, b, color) \
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{ \
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if (bytes_per_pixel != 2) { \
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unsigned short tmp; \
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tmp = (color >> 10) & 0x1f; \
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COLOR_FIX (r, tmp); \
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tmp = (color >> 5) & 0x1f; \
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COLOR_FIX (g, tmp); \
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tmp = color & 0x1f; \
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COLOR_FIX (b, tmp); \
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} \
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}
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#define COLORAB_TO_RGB4(rgb4, color4, colorA, colorB) \
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{ \
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unsigned short ta, tb, tt; \
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if (bytes_per_pixel != 2) { \
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ta = (colorA >> 10) & 0x1f; \
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tb = (colorB >> 10) & 0x1f; \
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COLOR_FIX (rgb4[3][0], ta); \
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COLOR_FIX (rgb4[0][0], tb); \
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tt = (11 * ta + 21 * tb) >> 5; \
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COLOR_FIX (rgb4[1][0], tt); \
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tt = (21 * ta + 11 * tb) >> 5; \
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COLOR_FIX (rgb4[2][0], tt); \
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ta = (colorA >> 5) & 0x1f; \
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tb = (colorB >> 5) & 0x1f; \
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COLOR_FIX (rgb4[3][1], ta); \
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COLOR_FIX (rgb4[0][1], tb); \
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tt = (11 * ta + 21 * tb) >> 5; \
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COLOR_FIX (rgb4[1][1], tt); \
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tt = (21 * ta + 11 * tb) >> 5; \
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COLOR_FIX (rgb4[2][1], tt); \
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ta = colorA & 0x1f; \
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tb = colorB & 0x1f; \
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COLOR_FIX (rgb4[3][2], ta); \
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COLOR_FIX (rgb4[0][2], tb); \
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tt = (11 * ta + 21 * tb) >> 5; \
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COLOR_FIX (rgb4[1][2], tt); \
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tt = (21 * ta + 11 * tb) >> 5; \
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COLOR_FIX (rgb4[2][2], tt); \
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} else { \
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color4[3] = colorA; \
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color4[0] = colorB; \
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ta = (colorA >> 10) & 0x1f; \
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tb = (colorB >> 10) & 0x1f; \
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color4[1] = ((11 * ta + 21 * tb) << 5) & 0x7c00; \
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color4[2] = ((21 * ta + 11 * tb) << 5) & 0x7c00; \
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ta = (colorA >> 5) & 0x1f; \
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tb = (colorB >> 5) & 0x1f; \
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color4[1] |= (11 * ta + 21 * tb) & 0x3e0; \
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color4[2] |= (21 * ta + 11 * tb) & 0x3e0; \
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ta = colorA & 0x1f; \
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tb = colorB & 0x1f; \
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color4[1] |= (11 * ta + 21 * tb) >> 5; \
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color4[2] |= (21 * ta + 11 * tb) >> 5; \
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} \
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}
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/*
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* rpza frame decoder
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*
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* Input values:
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*
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* *encoded: buffer of encoded data (chunk)
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* encoded_size: length of encoded buffer
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* *decoded: buffer where decoded data is written (image buffer)
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* width: width of decoded frame in pixels
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* height: height of decoded frame in pixels
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* bytes_per_pixel: bytes/pixel in output image (color depth)
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*
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*/
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void qt_decode_rpza(char *encoded, int encoded_size, char *decoded, int width,
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int height, int bytes_per_pixel)
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{
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int i;
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int stream_ptr = 0;
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int chunk_size;
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unsigned char opcode;
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int n_blocks;
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unsigned short colorA, colorB;
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unsigned char r, g, b;
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unsigned char rgb4[4][3];
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unsigned short color4[4];
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unsigned char index, idx;
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int row_ptr = 0;
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int pixel_ptr = 0;
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int pixel_x, pixel_y;
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int row_inc = bytes_per_pixel * (width - 4);
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int max_height = row_inc * height;
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int block_x_inc = bytes_per_pixel * 4;
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int block_y_inc = bytes_per_pixel * width;
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int block_ptr;
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int total_blocks;
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/* First byte is always 0xe1. Warn if it's different */
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if ((unsigned char)encoded[stream_ptr] != 0xe1)
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mp_msg(MSGT_DECVIDEO, MSGL_WARN,
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"First chunk byte is 0x%02x instead of 0x1e\n",
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(unsigned char)encoded[stream_ptr]);
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/* Get chunk size, ingnoring first byte */
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chunk_size = BE_32(&encoded[stream_ptr]) & 0x00FFFFFF;
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stream_ptr += 4;
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/* If length mismatch use size from MOV file and try to decode anyway */
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if (chunk_size != encoded_size)
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mp_msg(MSGT_DECVIDEO, MSGL_WARN, "MOV chunk size != encoded chunk size; using MOV chunk size\n");
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chunk_size = encoded_size;
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/* Number of 4x4 blocks in frame. */
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total_blocks = (width * height) / (4 * 4);
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/* Process chunk data */
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while (stream_ptr < chunk_size) {
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opcode = encoded[stream_ptr++]; /* Get opcode */
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n_blocks = (opcode & 0x1f) +1; /* Extract block counter from opcode */
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/* If opcode MSbit is 0, we need more data to decide what to do */
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if ((opcode & 0x80) == 0) {
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colorA = (opcode << 8) | ((unsigned char)encoded[stream_ptr++]);
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opcode = 0;
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if ((encoded[stream_ptr] & 0x80) != 0) {
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/* Must behave as opcode 110xxxxx, using colorA computed above.*/
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/* Use fake opcode 0x20 to enter switch block at the right place */
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opcode = 0x20;
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n_blocks = 1;
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}
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}
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switch (opcode & 0xe0) {
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/* Skip blocks */
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case 0x80:
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while (n_blocks--)
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ADVANCE_BLOCK();
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break;
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/* Fill blocks with one color */
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case 0xa0:
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colorA = BE_16 (&encoded[stream_ptr]);
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stream_ptr += 2;
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COLOR_TO_RGB (r, g, b, colorA);
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while (n_blocks--) {
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block_ptr = row_ptr + pixel_ptr;
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for (pixel_y = 0; pixel_y < 4; pixel_y++) {
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for (pixel_x = 0; pixel_x < 4; pixel_x++){
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PAINT_CURRENT_PIXEL(r, g, b, colorA);
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}
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block_ptr += row_inc;
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}
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ADVANCE_BLOCK();
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}
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break;
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/* Fill blocks with 4 colors */
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case 0xc0:
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colorA = BE_16 (&encoded[stream_ptr]);
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stream_ptr += 2;
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case 0x20:
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colorB = BE_16 (&encoded[stream_ptr]);
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stream_ptr += 2;
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COLORAB_TO_RGB4 (rgb4, color4, colorA, colorB);
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while (n_blocks--) {
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block_ptr = row_ptr + pixel_ptr;
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for (pixel_y = 0; pixel_y < 4; pixel_y++) {
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index = encoded[stream_ptr++];
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for (pixel_x = 0; pixel_x < 4; pixel_x++){
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idx = (index >> (2 * (3 - pixel_x))) & 0x03;
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PAINT_CURRENT_PIXEL(rgb4[idx][0], rgb4[idx][1], rgb4[idx][2], color4[idx]);
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}
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block_ptr += row_inc;
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}
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ADVANCE_BLOCK();
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}
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break;
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/* Fill block with 16 colors */
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case 0x00:
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block_ptr = row_ptr + pixel_ptr;
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for (pixel_y = 0; pixel_y < 4; pixel_y++) {
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for (pixel_x = 0; pixel_x < 4; pixel_x++){
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/* We already have color of upper left pixel */
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if ((pixel_y != 0) || (pixel_x !=0)) {
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colorA = BE_16 (&encoded[stream_ptr]);
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stream_ptr += 2;
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}
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COLOR_TO_RGB (r, g, b, colorA);
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PAINT_CURRENT_PIXEL(r, g, b, colorA);
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}
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block_ptr += row_inc;
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}
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ADVANCE_BLOCK();
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break;
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/* Unknown opcode */
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default:
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mp_msg(MSGT_DECVIDEO, MSGL_HINT, "Unknown opcode %d in rpza chunk."
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" Skip remaining %lu bytes of chunk data.\n", opcode,
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chunk_size - stream_ptr);
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return;
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} /* Opcode switch */
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}
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}
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