imgconvert.c

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.7平台上编译为嵌入式图形界面操作系统。

/*
 * Misc image convertion routines
 * Copyright (c) 2001, 2002 Fabrice Bellard.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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 "avcodec.h"
#include "dsputil.h"

#ifdef USE_FASTMEMCPY
#include "fastmemcpy.h"
#endif

#ifdef HAVE_MMX
#include "i386/mmx.h"
#endif
/* XXX: totally non optimized */

static void yuv422_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
                              UINT8 *src, int width, int height)
{
    int x, y;
    UINT8 *p = src;

    for(y=0;y<height;y+=2) {
        for(x=0;x<width;x+=2) {
            lum[0] = p[0];
            cb[0] = p[1];
            lum[1] = p[2];
            cr[0] = p[3];
            p += 4;
            lum += 2;
            cb++;
            cr++;
        }
        for(x=0;x<width;x+=2) {
            lum[0] = p[0];
            lum[1] = p[2];
            p += 4;
            lum += 2;
        }
    }
}

#define SCALEBITS 8
#define ONE_HALF  (1 << (SCALEBITS - 1))
#define FIX(x)		((int) ((x) * (1L<<SCALEBITS) + 0.5))

static void rgb24_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
                              UINT8 *src, int width, int height)
{
    int wrap, wrap3, x, y;
    int r, g, b, r1, g1, b1;
    UINT8 *p;

    wrap = width;
    wrap3 = width * 3;
    p = src;
    for(y=0;y<height;y+=2) {
        for(x=0;x<width;x+=2) {
            r = p[0];
            g = p[1];
            b = p[2];
            r1 = r;
            g1 = g;
            b1 = b;
            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            r = p[3];
            g = p[4];
            b = p[5];
            r1 += r;
            g1 += g;
            b1 += b;
            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            p += wrap3;
            lum += wrap;

            r = p[0];
            g = p[1];
            b = p[2];
            r1 += r;
            g1 += g;
            b1 += b;
            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            r = p[3];
            g = p[4];
            b = p[5];
            r1 += r;
            g1 += g;
            b1 += b;
            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            
            cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 + 
                      FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
            cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 - 
                     FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;

            cb++;
            cr++;
            p += -wrap3 + 2 * 3;
            lum += -wrap + 2;
        }
        p += wrap3;
        lum += wrap;
    }
}

static void rgba32_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
                              UINT8 *src, int width, int height)
{
    int wrap, wrap4, x, y;
    int r, g, b, r1, g1, b1;
    UINT8 *p;

    wrap = width;
    wrap4 = width * 4;
    p = src;
    for(y=0;y<height;y+=2) {
        for(x=0;x<width;x+=2) {
            r = p[0];
            g = p[1];
            b = p[2];
            r1 = r;
            g1 = g;
            b1 = b;
            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            r = p[4];
            g = p[5];
            b = p[6];
            r1 += r;
            g1 += g;
            b1 += b;
            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            p += wrap4;
            lum += wrap;

            r = p[0];
            g = p[1];
            b = p[2];
            r1 += r;
            g1 += g;
            b1 += b;
            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            r = p[4];
            g = p[5];
            b = p[6];
            r1 += r;
            g1 += g;
            b1 += b;
            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            
            cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 + 
                      FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
            cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 - 
                     FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;

            cb++;
            cr++;
            p += -wrap4 + 2 * 4;
            lum += -wrap + 2;
        }
        p += wrap4;
        lum += wrap;
    }
}

#define rgb565_to_yuv420p(lum,cb,cr,src,width,height) rgbmisc_to_yuv420p((lum),(cb),(cr),(src),(width),(height),0x0800,31, 0x0020,63,0x0001,31)
#define rgb555_to_yuv420p(lum,cb,cr,src,width,height) rgbmisc_to_yuv420p((lum),(cb),(cr),(src),(width),(height),0x0400,31, 0x0020,31,0x0001,31)
#define rgb5551_to_yuv420p(lum,cb,cr,src,width,height) rgbmisc_to_yuv420p((lum),(cb),(cr),(src),(width),(height),0x0800,31, 0x0040,31,0x0002,31)
#define bgr565_to_yuv420p(lum,cb,cr,src,width,height) rgbmisc_to_yuv420p((lum),(cb),(cr),(src),(width),(height),0x0001,31, 0x0020,63,0x0800,31)
#define bgr555_to_yuv420p(lum,cb,cr,src,width,height) rgbmisc_to_yuv420p((lum),(cb),(cr),(src),(width),(height),0x0001,31, 0x0020,31,0x0400,31)
#define gbr565_to_yuv420p(lum,cb,cr,src,width,height) rgbmisc_to_yuv420p((lum),(cb),(cr),(src),(width),(height),0x0001,31, 0x0800,31,0x0040,63)
#define gbr555_to_yuv420p(lum,cb,cr,src,width,height) rgbmisc_to_yuv420p((lum),(cb),(cr),(src),(width),(height),0x0001,31, 0x0400,31,0x0020,31)

static void rgbmisc_to_yuv420p
  (UINT8 *lum, UINT8 *cb, UINT8 *cr,
   UINT8 *src, int width, int height,
   
   UINT16 R_LOWMASK, UINT16 R_MAX,
   UINT16 G_LOWMASK, UINT16 G_MAX,
   UINT16 B_LOWMASK, UINT16 B_MAX
  )
{
    int wrap, wrap2, x, y;
    int r, g, b, r1, g1, b1;
    UINT8 *p;
    UINT16 pixel;

    wrap = width;
    wrap2 = width * 2;
    p = src;
    for(y=0;y<height;y+=2) {
        for(x=0;x<width;x+=2) {
            pixel = p[0] | (p[1]<<8);
            r = (((pixel/R_LOWMASK) & R_MAX) * (0x100 / (R_MAX+1)));
            g = (((pixel/G_LOWMASK) & G_MAX) * (0x100 / (G_MAX+1)));
            b = (((pixel/B_LOWMASK) & B_MAX) * (0x100 / (B_MAX+1)));
            r1 = r;
            g1 = g;
            b1 = b;
            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;

            pixel = p[2] | (p[3]<<8);
            r = (((pixel/R_LOWMASK) & R_MAX) * (0x100 / (R_MAX+1)));
            g = (((pixel/G_LOWMASK) & G_MAX) * (0x100 / (G_MAX+1)));
            b = (((pixel/B_LOWMASK) & B_MAX) * (0x100 / (B_MAX+1)));
            r1 += r;
            g1 += g;
            b1 += b;
            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            p += wrap2;
            lum += wrap;

            pixel = p[0] | (p[1]<<8);
            r = (((pixel/R_LOWMASK) & R_MAX) * (0x100 / (R_MAX+1)));
            g = (((pixel/G_LOWMASK) & G_MAX) * (0x100 / (G_MAX+1)));
            b = (((pixel/B_LOWMASK) & B_MAX) * (0x100 / (B_MAX+1)));
            r1 += r;
            g1 += g;
            b1 += b;
            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            pixel = p[2] | (p[3]<<8);
            r = (((pixel/R_LOWMASK) & R_MAX) * (0x100 / (R_MAX+1)));
            g = (((pixel/G_LOWMASK) & G_MAX) * (0x100 / (G_MAX+1)));
            b = (((pixel/B_LOWMASK) & B_MAX) * (0x100 / (B_MAX+1)));
            r1 += r;
            g1 += g;
            b1 += b;
            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            
            cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 + 
                      FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
            cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 - 
                     FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;

            cb++;
            cr++;
            p += -wrap2 + 2 * 2;
            lum += -wrap + 2;
        }
        p += wrap2;
        lum += wrap;
    }
}


static void bgr24_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
                              UINT8 *src, int width, int height)
{
    int wrap, wrap3, x, y;
    int r, g, b, r1, g1, b1;
    UINT8 *p;

    wrap = width;
    wrap3 = width * 3;
    p = src;
    for(y=0;y<height;y+=2) {
        for(x=0;x<width;x+=2) {
            b = p[0];
            g = p[1];
            r = p[2];
            r1 = r;
            g1 = g;
            b1 = b;
            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            b = p[3];
            g = p[4];
            r = p[5];
            r1 += r;
            g1 += g;
            b1 += b;
            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            p += wrap3;
            lum += wrap;

            b = p[0];
            g = p[1];
            r = p[2];
            r1 += r;
            g1 += g;
            b1 += b;
            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            b = p[3];
            g = p[4];
            r = p[5];
            r1 += r;
            g1 += g;
            b1 += b;
            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            
            cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 + 
                      FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
            cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 - 
                     FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;

            cb++;
            cr++;
            p += -wrap3 + 2 * 3;
            lum += -wrap + 2;
        }
        p += wrap3;
        lum += wrap;
    }
}

static void bgra32_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
                              UINT8 *src, int width, int height)
{
    int wrap, wrap4, x, y;
    int r, g, b, r1, g1, b1;
    UINT8 *p;

    wrap = width;
    wrap4 = width * 4;
    p = src;
    for(y=0;y<height;y+=2) {
        for(x=0;x<width;x+=2) {
            b = p[0];
            g = p[1];
            r = p[2];
            r1 = r;
            g1 = g;
            b1 = b;
            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            b = p[4];
            g = p[5];
            r = p[6];
            r1 += r;
            g1 += g;
            b1 += b;
            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 
                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            p += wrap4;
            lum += wrap;

            b = p[0];
            g = p[1];
            r = p[2];
            r1 += r;
            g1 += g;
            b1 += b;
            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +