swscale: partially move the arch specific code left

PPC and x86 code is split off from swscale_template.c. Lots of code is
still duplicated and should be removed later.

Again uniformize the init system to be more similar to the dsputil one.

Unset h*scale_fast in the x86 init in order to make the output
consistent with the previous status. Thanks to Josh for spotting it.

1 files changed, 903 insertions, 0 deletions

diff --git a/libswscale/ppc/swscale_template.c b/libswscale/ppc/swscale_template.c
new file mode 100644
index 0000000000..71daf116d8
--- /dev/null
+++ b/libswscale/ppc/swscale_template.c
@@ -0,0 +1,903 @@
+/*
+ * Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+#if COMPILE_TEMPLATE_ALTIVEC
+#include "ppc/swscale_altivec_template.c"
+#endif
+
+static inline void RENAME(yuv2yuvX)(SwsContext *c, const int16_t *lumFilter, const int16_t **lumSrc, int lumFilterSize,
+                                    const int16_t *chrFilter, const int16_t **chrSrc, int chrFilterSize, const int16_t **alpSrc,
+                                    uint8_t *dest, uint8_t *uDest, uint8_t *vDest, uint8_t *aDest, long dstW, long chrDstW)
+{
+#if COMPILE_TEMPLATE_ALTIVEC
+    yuv2yuvX_altivec_real(lumFilter, lumSrc, lumFilterSize,
+                          chrFilter, chrSrc, chrFilterSize,
+                          dest, uDest, vDest, dstW, chrDstW);
+#else //COMPILE_TEMPLATE_ALTIVEC
+    yuv2yuvXinC(lumFilter, lumSrc, lumFilterSize,
+                chrFilter, chrSrc, chrFilterSize,
+                alpSrc, dest, uDest, vDest, aDest, dstW, chrDstW);
+#endif //!COMPILE_TEMPLATE_ALTIVEC
+}
+
+static inline void RENAME(yuv2nv12X)(SwsContext *c, const int16_t *lumFilter, const int16_t **lumSrc, int lumFilterSize,
+                                     const int16_t *chrFilter, const int16_t **chrSrc, int chrFilterSize,
+                                     uint8_t *dest, uint8_t *uDest, int dstW, int chrDstW, enum PixelFormat dstFormat)
+{
+    yuv2nv12XinC(lumFilter, lumSrc, lumFilterSize,
+                 chrFilter, chrSrc, chrFilterSize,
+                 dest, uDest, dstW, chrDstW, dstFormat);
+}
+
+static inline void RENAME(yuv2yuv1)(SwsContext *c, const int16_t *lumSrc, const int16_t *chrSrc, const int16_t *alpSrc,
+                                    uint8_t *dest, uint8_t *uDest, uint8_t *vDest, uint8_t *aDest, long dstW, long chrDstW)
+{
+    int i;
+    for (i=0; i<dstW; i++) {
+        int val= (lumSrc[i]+64)>>7;
+
+        if (val&256) {
+            if (val<0) val=0;
+            else       val=255;
+        }
+
+        dest[i]= val;
+    }
+
+    if (uDest)
+        for (i=0; i<chrDstW; i++) {
+            int u=(chrSrc[i       ]+64)>>7;
+            int v=(chrSrc[i + VOFW]+64)>>7;
+
+            if ((u|v)&256) {
+                if (u<0)        u=0;
+                else if (u>255) u=255;
+                if (v<0)        v=0;
+                else if (v>255) v=255;
+            }
+
+            uDest[i]= u;
+            vDest[i]= v;
+        }
+
+    if (CONFIG_SWSCALE_ALPHA && aDest)
+        for (i=0; i<dstW; i++) {
+            int val= (alpSrc[i]+64)>>7;
+            aDest[i]= av_clip_uint8(val);
+        }
+}
+
+
+/**
+ * vertical scale YV12 to RGB
+ */
+static inline void RENAME(yuv2packedX)(SwsContext *c, const int16_t *lumFilter, const int16_t **lumSrc, int lumFilterSize,
+                                       const int16_t *chrFilter, const int16_t **chrSrc, int chrFilterSize,
+                                       const int16_t **alpSrc, uint8_t *dest, long dstW, long dstY)
+{
+#if COMPILE_TEMPLATE_ALTIVEC
+    /* The following list of supported dstFormat values should
+       match what's found in the body of ff_yuv2packedX_altivec() */
+    if (!(c->flags & SWS_BITEXACT) && !c->alpPixBuf &&
+         (c->dstFormat==PIX_FMT_ABGR  || c->dstFormat==PIX_FMT_BGRA  ||
+          c->dstFormat==PIX_FMT_BGR24 || c->dstFormat==PIX_FMT_RGB24 ||
+          c->dstFormat==PIX_FMT_RGBA  || c->dstFormat==PIX_FMT_ARGB))
+            ff_yuv2packedX_altivec(c, lumFilter, lumSrc, lumFilterSize,
+                                   chrFilter, chrSrc, chrFilterSize,
+                                   dest, dstW, dstY);
+    else
+#endif
+        yuv2packedXinC(c, lumFilter, lumSrc, lumFilterSize,
+                       chrFilter, chrSrc, chrFilterSize,
+                       alpSrc, dest, dstW, dstY);
+}
+
+/**
+ * vertical bilinear scale YV12 to RGB
+ */
+static inline void RENAME(yuv2packed2)(SwsContext *c, const uint16_t *buf0, const uint16_t *buf1, const uint16_t *uvbuf0, const uint16_t *uvbuf1,
+                          const uint16_t *abuf0, const uint16_t *abuf1, uint8_t *dest, int dstW, int yalpha, int uvalpha, int y)
+{
+    int  yalpha1=4095- yalpha;
+    int uvalpha1=4095-uvalpha;
+    int i;
+
+    YSCALE_YUV_2_ANYRGB_C(YSCALE_YUV_2_RGB2_C, YSCALE_YUV_2_PACKED2_C(void,0), YSCALE_YUV_2_GRAY16_2_C, YSCALE_YUV_2_MONO2_C)
+}
+
+/**
+ * YV12 to RGB without scaling or interpolating
+ */
+static inline void RENAME(yuv2packed1)(SwsContext *c, const uint16_t *buf0, const uint16_t *uvbuf0, const uint16_t *uvbuf1,
+                          const uint16_t *abuf0, uint8_t *dest, int dstW, int uvalpha, enum PixelFormat dstFormat, int flags, int y)
+{
+    const int yalpha1=0;
+    int i;
+
+    const uint16_t *buf1= buf0; //FIXME needed for RGB1/BGR1
+    const int yalpha= 4096; //FIXME ...
+
+    if (flags&SWS_FULL_CHR_H_INT) {
+        c->yuv2packed2(c, buf0, buf0, uvbuf0, uvbuf1, abuf0, abuf0, dest, dstW, 0, uvalpha, y);
+        return;
+    }
+
+    if (uvalpha < 2048) {
+        YSCALE_YUV_2_ANYRGB_C(YSCALE_YUV_2_RGB1_C, YSCALE_YUV_2_PACKED1_C(void,0), YSCALE_YUV_2_GRAY16_1_C, YSCALE_YUV_2_MONO2_C)
+    } else {
+        YSCALE_YUV_2_ANYRGB_C(YSCALE_YUV_2_RGB1B_C, YSCALE_YUV_2_PACKED1B_C(void,0), YSCALE_YUV_2_GRAY16_1_C, YSCALE_YUV_2_MONO2_C)
+    }
+}
+
+//FIXME yuy2* can read up to 7 samples too much
+
+static inline void RENAME(yuy2ToY)(uint8_t *dst, const uint8_t *src, long width, uint32_t *unused)
+{
+    int i;
+    for (i=0; i<width; i++)
+        dst[i]= src[2*i];
+}
+
+static inline void RENAME(yuy2ToUV)(uint8_t *dstU, uint8_t *dstV, const uint8_t *src1, const uint8_t *src2, long width, uint32_t *unused)
+{
+    int i;
+    for (i=0; i<width; i++) {
+        dstU[i]= src1[4*i + 1];
+        dstV[i]= src1[4*i + 3];
+    }
+    assert(src1 == src2);
+}
+
+static inline void RENAME(LEToUV)(uint8_t *dstU, uint8_t *dstV, const uint8_t *src1, const uint8_t *src2, long width, uint32_t *unused)
+{
+    int i;
+    for (i=0; i<width; i++) {
+        dstU[i]= src1[2*i + 1];
+        dstV[i]= src2[2*i + 1];
+    }
+}
+
+/* This is almost identical to the previous, end exists only because
+ * yuy2ToY/UV)(dst, src+1, ...) would have 100% unaligned accesses. */
+static inline void RENAME(uyvyToY)(uint8_t *dst, const uint8_t *src, long width, uint32_t *unused)
+{
+    int i;
+    for (i=0; i<width; i++)
+        dst[i]= src[2*i+1];
+}
+
+static inline void RENAME(uyvyToUV)(uint8_t *dstU, uint8_t *dstV, const uint8_t *src1, const uint8_t *src2, long width, uint32_t *unused)
+{
+    int i;
+    for (i=0; i<width; i++) {
+        dstU[i]= src1[4*i + 0];
+        dstV[i]= src1[4*i + 2];
+    }
+    assert(src1 == src2);
+}
+
+static inline void RENAME(BEToUV)(uint8_t *dstU, uint8_t *dstV, const uint8_t *src1, const uint8_t *src2, long width, uint32_t *unused)
+{
+    int i;
+    for (i=0; i<width; i++) {
+        dstU[i]= src1[2*i];
+        dstV[i]= src2[2*i];
+    }
+}
+
+static inline void RENAME(nvXXtoUV)(uint8_t *dst1, uint8_t *dst2,
+                                    const uint8_t *src, long width)
+{
+    int i;
+    for (i = 0; i < width; i++) {
+        dst1[i] = src[2*i+0];
+        dst2[i] = src[2*i+1];
+    }
+}
+
+static inline void RENAME(nv12ToUV)(uint8_t *dstU, uint8_t *dstV,
+                                    const uint8_t *src1, const uint8_t *src2,
+                                    long width, uint32_t *unused)
+{
+    RENAME(nvXXtoUV)(dstU, dstV, src1, width);
+}
+
+static inline void RENAME(nv21ToUV)(uint8_t *dstU, uint8_t *dstV,
+                                    const uint8_t *src1, const uint8_t *src2,
+                                    long width, uint32_t *unused)
+{
+    RENAME(nvXXtoUV)(dstV, dstU, src1, width);
+}
+
+
+static inline void RENAME(bgr24ToY)(uint8_t *dst, const uint8_t *src, long width, uint32_t *unused)
+{
+    int i;
+    for (i=0; i<width; i++) {
+        int b= src[i*3+0];
+        int g= src[i*3+1];
+        int r= src[i*3+2];
+
+        dst[i]= ((RY*r + GY*g + BY*b + (33<<(RGB2YUV_SHIFT-1)))>>RGB2YUV_SHIFT);
+    }
+}
+
+static inline void RENAME(bgr24ToUV)(uint8_t *dstU, uint8_t *dstV, const uint8_t *src1, const uint8_t *src2, long width, uint32_t *unused)
+{
+    int i;
+    for (i=0; i<width; i++) {
+        int b= src1[3*i + 0];
+        int g= src1[3*i + 1];
+        int r= src1[3*i + 2];
+
+        dstU[i]= (RU*r + GU*g + BU*b + (257<<(RGB2YUV_SHIFT-1)))>>RGB2YUV_SHIFT;
+        dstV[i]= (RV*r + GV*g + BV*b + (257<<(RGB2YUV_SHIFT-1)))>>RGB2YUV_SHIFT;
+    }
+    assert(src1 == src2);
+}
+
+static inline void RENAME(bgr24ToUV_half)(uint8_t *dstU, uint8_t *dstV, const uint8_t *src1, const uint8_t *src2, long width, uint32_t *unused)
+{
+    int i;
+    for (i=0; i<width; i++) {
+        int b= src1[6*i + 0] + src1[6*i + 3];
+        int g= src1[6*i + 1] + src1[6*i + 4];
+        int r= src1[6*i + 2] + src1[6*i + 5];
+
+        dstU[i]= (RU*r + GU*g + BU*b + (257<<RGB2YUV_SHIFT))>>(RGB2YUV_SHIFT+1);
+        dstV[i]= (RV*r + GV*g + BV*b + (257<<RGB2YUV_SHIFT))>>(RGB2YUV_SHIFT+1);
+    }
+    assert(src1 == src2);
+}
+
+static inline void RENAME(rgb24ToY)(uint8_t *dst, const uint8_t *src, long width, uint32_t *unused)
+{
+    int i;
+    for (i=0; i<width; i++) {
+        int r= src[i*3+0];
+        int g= src[i*3+1];
+        int b= src[i*3+2];
+
+        dst[i]= ((RY*r + GY*g + BY*b + (33<<(RGB2YUV_SHIFT-1)))>>RGB2YUV_SHIFT);
+    }
+}
+
+static inline void RENAME(rgb24ToUV)(uint8_t *dstU, uint8_t *dstV, const uint8_t *src1, const uint8_t *src2, long width, uint32_t *unused)
+{
+    int i;
+    assert(src1==src2);
+    for (i=0; i<width; i++) {
+        int r= src1[3*i + 0];
+        int g= src1[3*i + 1];
+        int b= src1[3*i + 2];
+
+        dstU[i]= (RU*r + GU*g + BU*b + (257<<(RGB2YUV_SHIFT-1)))>>RGB2YUV_SHIFT;
+        dstV[i]= (RV*r + GV*g + BV*b + (257<<(RGB2YUV_SHIFT-1)))>>RGB2YUV_SHIFT;
+    }
+}
+
+static inline void RENAME(rgb24ToUV_half)(uint8_t *dstU, uint8_t *dstV, const uint8_t *src1, const uint8_t *src2, long width, uint32_t *unused)
+{
+    int i;
+    assert(src1==src2);
+    for (i=0; i<width; i++) {
+        int r= src1[6*i + 0] + src1[6*i + 3];
+        int g= src1[6*i + 1] + src1[6*i + 4];
+        int b= src1[6*i + 2] + src1[6*i + 5];
+
+        dstU[i]= (RU*r + GU*g + BU*b + (257<<RGB2YUV_SHIFT))>>(RGB2YUV_SHIFT+1);
+        dstV[i]= (RV*r + GV*g + BV*b + (257<<RGB2YUV_SHIFT))>>(RGB2YUV_SHIFT+1);
+    }
+}
+
+
+// bilinear / bicubic scaling
+static inline void RENAME(hScale)(int16_t *dst, int dstW, const uint8_t *src, int srcW, int xInc,
+                                  const int16_t *filter, const int16_t *filterPos, long filterSize)
+{
+#if COMPILE_TEMPLATE_ALTIVEC
+    hScale_altivec_real(dst, dstW, src, srcW, xInc, filter, filterPos, filterSize);
+#else
+    int i;
+    for (i=0; i<dstW; i++) {
+        int j;
+        int srcPos= filterPos[i];
+        int val=0;
+        //printf("filterPos: %d\n", filterPos[i]);
+        for (j=0; j<filterSize; j++) {
+            //printf("filter: %d, src: %d\n", filter[i], src[srcPos + j]);
+            val += ((int)src[srcPos + j])*filter[filterSize*i + j];
+        }
+        //filter += hFilterSize;
+        dst[i] = FFMIN(val>>7, (1<<15)-1); // the cubic equation does overflow ...
+        //dst[i] = val>>7;
+    }
+#endif /* COMPILE_TEMPLATE_ALTIVEC */
+}
+
+//FIXME all pal and rgb srcFormats could do this convertion as well
+//FIXME all scalers more complex than bilinear could do half of this transform
+static void RENAME(chrRangeToJpeg)(uint16_t *dst, int width)
+{
+    int i;
+    for (i = 0; i < width; i++) {
+        dst[i     ] = (FFMIN(dst[i     ],30775)*4663 - 9289992)>>12; //-264
+        dst[i+VOFW] = (FFMIN(dst[i+VOFW],30775)*4663 - 9289992)>>12; //-264
+    }
+}
+static void RENAME(chrRangeFromJpeg)(uint16_t *dst, int width)
+{
+    int i;
+    for (i = 0; i < width; i++) {
+        dst[i     ] = (dst[i     ]*1799 + 4081085)>>11; //1469
+        dst[i+VOFW] = (dst[i+VOFW]*1799 + 4081085)>>11; //1469
+    }
+}
+static void RENAME(lumRangeToJpeg)(uint16_t *dst, int width)
+{
+    int i;
+    for (i = 0; i < width; i++)
+        dst[i] = (FFMIN(dst[i],30189)*19077 - 39057361)>>14;
+}
+static void RENAME(lumRangeFromJpeg)(uint16_t *dst, int width)
+{
+    int i;
+    for (i = 0; i < width; i++)
+        dst[i] = (dst[i]*14071 + 33561947)>>14;
+}
+
+static inline void RENAME(hyscale_fast)(SwsContext *c, int16_t *dst,
+                                        long dstWidth, const uint8_t *src, int srcW,
+                                        int xInc)
+{
+    int i;
+    unsigned int xpos=0;
+    for (i=0;i<dstWidth;i++) {
+        register unsigned int xx=xpos>>16;
+        register unsigned int xalpha=(xpos&0xFFFF)>>9;
+        dst[i]= (src[xx]<<7) + (src[xx+1] - src[xx])*xalpha;
+        xpos+=xInc;
+    }
+}
+
+      // *** horizontal scale Y line to temp buffer
+static inline void RENAME(hyscale)(SwsContext *c, uint16_t *dst, long dstWidth, const uint8_t *src, int srcW, int xInc,
+                                   const int16_t *hLumFilter,
+                                   const int16_t *hLumFilterPos, int hLumFilterSize,
+                                   uint8_t *formatConvBuffer,
+                                   uint32_t *pal, int isAlpha)
+{
+    void (*toYV12)(uint8_t *, const uint8_t *, long, uint32_t *) = isAlpha ? c->alpToYV12 : c->lumToYV12;
+    void (*convertRange)(uint16_t *, int) = isAlpha ? NULL : c->lumConvertRange;
+
+    src += isAlpha ? c->alpSrcOffset : c->lumSrcOffset;
+
+    if (toYV12) {
+        toYV12(formatConvBuffer, src, srcW, pal);
+        src= formatConvBuffer;
+    }
+
+    if (!c->hyscale_fast) {
+        c->hScale(dst, dstWidth, src, srcW, xInc, hLumFilter, hLumFilterPos, hLumFilterSize);
+    } else { // fast bilinear upscale / crap downscale
+        c->hyscale_fast(c, dst, dstWidth, src, srcW, xInc);
+    }
+
+    if (convertRange)
+        convertRange(dst, dstWidth);
+}
+
+static inline void RENAME(hcscale_fast)(SwsContext *c, int16_t *dst,
+                                        long dstWidth, const uint8_t *src1,
+                                        const uint8_t *src2, int srcW, int xInc)
+{
+    int i;
+    unsigned int xpos=0;
+    for (i=0;i<dstWidth;i++) {
+        register unsigned int xx=xpos>>16;
+        register unsigned int xalpha=(xpos&0xFFFF)>>9;
+        dst[i]=(src1[xx]*(xalpha^127)+src1[xx+1]*xalpha);
+        dst[i+VOFW]=(src2[xx]*(xalpha^127)+src2[xx+1]*xalpha);
+        /* slower
+        dst[i]= (src1[xx]<<7) + (src1[xx+1] - src1[xx])*xalpha;
+        dst[i+VOFW]=(src2[xx]<<7) + (src2[xx+1] - src2[xx])*xalpha;
+        */
+        xpos+=xInc;
+    }
+}
+
+inline static void RENAME(hcscale)(SwsContext *c, uint16_t *dst, long dstWidth, const uint8_t *src1, const uint8_t *src2,
+                                   int srcW, int xInc, const int16_t *hChrFilter,
+                                   const int16_t *hChrFilterPos, int hChrFilterSize,
+                                   uint8_t *formatConvBuffer,
+                                   uint32_t *pal)
+{
+
+    src1 += c->chrSrcOffset;
+    src2 += c->chrSrcOffset;
+
+    if (c->chrToYV12) {
+        c->chrToYV12(formatConvBuffer, formatConvBuffer+VOFW, src1, src2, srcW, pal);
+        src1= formatConvBuffer;
+        src2= formatConvBuffer+VOFW;
+    }
+
+    if (!c->hcscale_fast) {
+        c->hScale(dst     , dstWidth, src1, srcW, xInc, hChrFilter, hChrFilterPos, hChrFilterSize);
+        c->hScale(dst+VOFW, dstWidth, src2, srcW, xInc, hChrFilter, hChrFilterPos, hChrFilterSize);
+    } else { // fast bilinear upscale / crap downscale
+        c->hcscale_fast(c, dst, dstWidth, src1, src2, srcW, xInc);
+    }
+
+    if (c->chrConvertRange)
+        c->chrConvertRange(dst, dstWidth);
+}
+
+#define DEBUG_SWSCALE_BUFFERS 0
+#define DEBUG_BUFFERS(...) if (DEBUG_SWSCALE_BUFFERS) av_log(c, AV_LOG_DEBUG, __VA_ARGS__)
+
+static int RENAME(swScale)(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
+                           int srcSliceH, uint8_t* dst[], int dstStride[])
+{
+    /* load a few things into local vars to make the code more readable? and faster */
+    const int srcW= c->srcW;
+    const int dstW= c->dstW;
+    const int dstH= c->dstH;
+    const int chrDstW= c->chrDstW;
+    const int chrSrcW= c->chrSrcW;
+    const int lumXInc= c->lumXInc;
+    const int chrXInc= c->chrXInc;
+    const enum PixelFormat dstFormat= c->dstFormat;
+    const int flags= c->flags;
+    int16_t *vLumFilterPos= c->vLumFilterPos;
+    int16_t *vChrFilterPos= c->vChrFilterPos;
+    int16_t *hLumFilterPos= c->hLumFilterPos;
+    int16_t *hChrFilterPos= c->hChrFilterPos;
+    int16_t *vLumFilter= c->vLumFilter;
+    int16_t *vChrFilter= c->vChrFilter;
+    int16_t *hLumFilter= c->hLumFilter;
+    int16_t *hChrFilter= c->hChrFilter;
+    int32_t *lumMmxFilter= c->lumMmxFilter;
+    int32_t *chrMmxFilter= c->chrMmxFilter;
+    int32_t av_unused *alpMmxFilter= c->alpMmxFilter;
+    const int vLumFilterSize= c->vLumFilterSize;
+    const int vChrFilterSize= c->vChrFilterSize;
+    const int hLumFilterSize= c->hLumFilterSize;
+    const int hChrFilterSize= c->hChrFilterSize;
+    int16_t **lumPixBuf= c->lumPixBuf;
+    int16_t **chrPixBuf= c->chrPixBuf;
+    int16_t **alpPixBuf= c->alpPixBuf;
+    const int vLumBufSize= c->vLumBufSize;
+    const int vChrBufSize= c->vChrBufSize;
+    uint8_t *formatConvBuffer= c->formatConvBuffer;
+    const int chrSrcSliceY= srcSliceY >> c->chrSrcVSubSample;
+    const int chrSrcSliceH= -((-srcSliceH) >> c->chrSrcVSubSample);
+    int lastDstY;
+    uint32_t *pal=c->pal_yuv;
+
+    /* vars which will change and which we need to store back in the context */
+    int dstY= c->dstY;
+    int lumBufIndex= c->lumBufIndex;
+    int chrBufIndex= c->chrBufIndex;
+    int lastInLumBuf= c->lastInLumBuf;
+    int lastInChrBuf= c->lastInChrBuf;
+
+    if (isPacked(c->srcFormat)) {
+        src[0]=
+        src[1]=
+        src[2]=
+        src[3]= src[0];
+        srcStride[0]=
+        srcStride[1]=
+        srcStride[2]=
+        srcStride[3]= srcStride[0];
+    }
+    srcStride[1]<<= c->vChrDrop;
+    srcStride[2]<<= c->vChrDrop;
+
+    DEBUG_BUFFERS("swScale() %p[%d] %p[%d] %p[%d] %p[%d] -> %p[%d] %p[%d] %p[%d] %p[%d]\n",
+                  src[0], srcStride[0], src[1], srcStride[1], src[2], srcStride[2], src[3], srcStride[3],
+                  dst[0], dstStride[0], dst[1], dstStride[1], dst[2], dstStride[2], dst[3], dstStride[3]);
+    DEBUG_BUFFERS("srcSliceY: %d srcSliceH: %d dstY: %d dstH: %d\n",
+                   srcSliceY,    srcSliceH,    dstY,    dstH);
+    DEBUG_BUFFERS("vLumFilterSize: %d vLumBufSize: %d vChrFilterSize: %d vChrBufSize: %d\n",
+                   vLumFilterSize,    vLumBufSize,    vChrFilterSize,    vChrBufSize);
+
+    if (dstStride[0]%8 !=0 || dstStride[1]%8 !=0 || dstStride[2]%8 !=0 || dstStride[3]%8 != 0) {
+        static int warnedAlready=0; //FIXME move this into the context perhaps
+        if (flags & SWS_PRINT_INFO && !warnedAlready) {
+            av_log(c, AV_LOG_WARNING, "Warning: dstStride is not aligned!\n"
+                   "         ->cannot do aligned memory accesses anymore\n");
+            warnedAlready=1;
+        }
+    }
+
+    /* Note the user might start scaling the picture in the middle so this
+       will not get executed. This is not really intended but works
+       currently, so people might do it. */
+    if (srcSliceY ==0) {
+        lumBufIndex=-1;
+        chrBufIndex=-1;
+        dstY=0;
+        lastInLumBuf= -1;
+        lastInChrBuf= -1;
+    }
+
+    lastDstY= dstY;
+
+    for (;dstY < dstH; dstY++) {
+        unsigned char *dest =dst[0]+dstStride[0]*dstY;
+        const int chrDstY= dstY>>c->chrDstVSubSample;
+        unsigned char *uDest=dst[1]+dstStride[1]*chrDstY;
+        unsigned char *vDest=dst[2]+dstStride[2]*chrDstY;
+        unsigned char *aDest=(CONFIG_SWSCALE_ALPHA && alpPixBuf) ? dst[3]+dstStride[3]*dstY : NULL;
+
+        const int firstLumSrcY= vLumFilterPos[dstY]; //First line needed as input
+        const int firstLumSrcY2= vLumFilterPos[FFMIN(dstY | ((1<<c->chrDstVSubSample) - 1), dstH-1)];
+        const int firstChrSrcY= vChrFilterPos[chrDstY]; //First line needed as input
+        int lastLumSrcY= firstLumSrcY + vLumFilterSize -1; // Last line needed as input
+        int lastLumSrcY2=firstLumSrcY2+ vLumFilterSize -1; // Last line needed as input
+        int lastChrSrcY= firstChrSrcY + vChrFilterSize -1; // Last line needed as input
+        int enough_lines;
+
+        //handle holes (FAST_BILINEAR & weird filters)
+        if (firstLumSrcY > lastInLumBuf) lastInLumBuf= firstLumSrcY-1;
+        if (firstChrSrcY > lastInChrBuf) lastInChrBuf= firstChrSrcY-1;
+        assert(firstLumSrcY >= lastInLumBuf - vLumBufSize + 1);
+        assert(firstChrSrcY >= lastInChrBuf - vChrBufSize + 1);
+
+        DEBUG_BUFFERS("dstY: %d\n", dstY);
+        DEBUG_BUFFERS("\tfirstLumSrcY: %d lastLumSrcY: %d lastInLumBuf: %d\n",
+                         firstLumSrcY,    lastLumSrcY,    lastInLumBuf);
+        DEBUG_BUFFERS("\tfirstChrSrcY: %d lastChrSrcY: %d lastInChrBuf: %d\n",
+                         firstChrSrcY,    lastChrSrcY,    lastInChrBuf);
+
+        // Do we have enough lines in this slice to output the dstY line
+        enough_lines = lastLumSrcY2 < srcSliceY + srcSliceH && lastChrSrcY < -((-srcSliceY - srcSliceH)>>c->chrSrcVSubSample);
+
+        if (!enough_lines) {
+            lastLumSrcY = srcSliceY + srcSliceH - 1;
+            lastChrSrcY = chrSrcSliceY + chrSrcSliceH - 1;
+            DEBUG_BUFFERS("buffering slice: lastLumSrcY %d lastChrSrcY %d\n",
+                                            lastLumSrcY, lastChrSrcY);
+        }
+
+        //Do horizontal scaling
+        while(lastInLumBuf < lastLumSrcY) {
+            const uint8_t *src1= src[0]+(lastInLumBuf + 1 - srcSliceY)*srcStride[0];
+            const uint8_t *src2= src[3]+(lastInLumBuf + 1 - srcSliceY)*srcStride[3];
+            lumBufIndex++;
+            assert(lumBufIndex < 2*vLumBufSize);
+            assert(lastInLumBuf + 1 - srcSliceY < srcSliceH);
+            assert(lastInLumBuf + 1 - srcSliceY >= 0);
+            RENAME(hyscale)(c, lumPixBuf[ lumBufIndex ], dstW, src1, srcW, lumXInc,
+                            hLumFilter, hLumFilterPos, hLumFilterSize,
+                            formatConvBuffer,
+                            pal, 0);
+            if (CONFIG_SWSCALE_ALPHA && alpPixBuf)
+                RENAME(hyscale)(c, alpPixBuf[ lumBufIndex ], dstW, src2, srcW, lumXInc,
+                                hLumFilter, hLumFilterPos, hLumFilterSize,
+                                formatConvBuffer,
+                                pal, 1);
+            lastInLumBuf++;
+            DEBUG_BUFFERS("\t\tlumBufIndex %d: lastInLumBuf: %d\n",
+                               lumBufIndex,    lastInLumBuf);
+        }
+        while(lastInChrBuf < lastChrSrcY) {
+            const uint8_t *src1= src[1]+(lastInChrBuf + 1 - chrSrcSliceY)*srcStride[1];
+            const uint8_t *src2= src[2]+(lastInChrBuf + 1 - chrSrcSliceY)*srcStride[2];
+            chrBufIndex++;
+            assert(chrBufIndex < 2*vChrBufSize);
+            assert(lastInChrBuf + 1 - chrSrcSliceY < (chrSrcSliceH));
+            assert(lastInChrBuf + 1 - chrSrcSliceY >= 0);
+            //FIXME replace parameters through context struct (some at least)
+
+            if (c->needs_hcscale)
+                RENAME(hcscale)(c, chrPixBuf[ chrBufIndex ], chrDstW, src1, src2, chrSrcW, chrXInc,
+                                hChrFilter, hChrFilterPos, hChrFilterSize,
+                                formatConvBuffer,
+                                pal);
+            lastInChrBuf++;
+            DEBUG_BUFFERS("\t\tchrBufIndex %d: lastInChrBuf: %d\n",
+                               chrBufIndex,    lastInChrBuf);
+        }
+        //wrap buf index around to stay inside the ring buffer
+        if (lumBufIndex >= vLumBufSize) lumBufIndex-= vLumBufSize;
+        if (chrBufIndex >= vChrBufSize) chrBufIndex-= vChrBufSize;
+        if (!enough_lines)
+            break; //we can't output a dstY line so let's try with the next slice
+
+        if (dstY < dstH-2) {
+            const int16_t **lumSrcPtr= (const int16_t **) lumPixBuf + lumBufIndex + firstLumSrcY - lastInLumBuf + vLumBufSize;
+            const int16_t **chrSrcPtr= (const int16_t **) chrPixBuf + chrBufIndex + firstChrSrcY - lastInChrBuf + vChrBufSize;
+            const int16_t **alpSrcPtr= (CONFIG_SWSCALE_ALPHA && alpPixBuf) ? (const int16_t **) alpPixBuf + lumBufIndex + firstLumSrcY - lastInLumBuf + vLumBufSize : NULL;
+            if (dstFormat == PIX_FMT_NV12 || dstFormat == PIX_FMT_NV21) {
+                const int chrSkipMask= (1<<c->chrDstVSubSample)-1;
+                if (dstY&chrSkipMask) uDest= NULL; //FIXME split functions in lumi / chromi
+                c->yuv2nv12X(c,
+                             vLumFilter+dstY*vLumFilterSize   , lumSrcPtr, vLumFilterSize,
+                             vChrFilter+chrDstY*vChrFilterSize, chrSrcPtr, vChrFilterSize,
+                             dest, uDest, dstW, chrDstW, dstFormat);
+            } else if (isPlanarYUV(dstFormat) || dstFormat==PIX_FMT_GRAY8) { //YV12 like
+                const int chrSkipMask= (1<<c->chrDstVSubSample)-1;
+                if ((dstY&chrSkipMask) || isGray(dstFormat)) uDest=vDest= NULL; //FIXME split functions in lumi / chromi
+                if (is16BPS(dstFormat)) {
+                    yuv2yuvX16inC(
+                                  vLumFilter+dstY*vLumFilterSize   , lumSrcPtr, vLumFilterSize,
+                                  vChrFilter+chrDstY*vChrFilterSize, chrSrcPtr, vChrFilterSize,
+                                  alpSrcPtr, (uint16_t *) dest, (uint16_t *) uDest, (uint16_t *) vDest, (uint16_t *) aDest, dstW, chrDstW,
+                                  dstFormat);
+                } else if (vLumFilterSize == 1 && vChrFilterSize == 1) { // unscaled YV12
+                    const int16_t *lumBuf = lumSrcPtr[0];
+                    const int16_t *chrBuf= chrSrcPtr[0];
+                    const int16_t *alpBuf= (CONFIG_SWSCALE_ALPHA && alpPixBuf) ? alpSrcPtr[0] : NULL;
+                    c->yuv2yuv1(c, lumBuf, chrBuf, alpBuf, dest, uDest, vDest, aDest, dstW, chrDstW);
+                } else { //General YV12
+                    c->yuv2yuvX(c,
+                                vLumFilter+dstY*vLumFilterSize   , lumSrcPtr, vLumFilterSize,
+                                vChrFilter+chrDstY*vChrFilterSize, chrSrcPtr, vChrFilterSize,
+                                alpSrcPtr, dest, uDest, vDest, aDest, dstW, chrDstW);
+                }
+            } else {
+                assert(lumSrcPtr + vLumFilterSize - 1 < lumPixBuf + vLumBufSize*2);
+                assert(chrSrcPtr + vChrFilterSize - 1 < chrPixBuf + vChrBufSize*2);
+                if (vLumFilterSize == 1 && vChrFilterSize == 2) { //unscaled RGB
+                    int chrAlpha= vChrFilter[2*dstY+1];
+                    if(flags & SWS_FULL_CHR_H_INT) {
+                        yuv2rgbXinC_full(c, //FIXME write a packed1_full function
+                                         vLumFilter+dstY*vLumFilterSize, lumSrcPtr, vLumFilterSize,
+                                         vChrFilter+dstY*vChrFilterSize, chrSrcPtr, vChrFilterSize,
+                                         alpSrcPtr, dest, dstW, dstY);
+                    } else {
+                        c->yuv2packed1(c, *lumSrcPtr, *chrSrcPtr, *(chrSrcPtr+1),
+                                       alpPixBuf ? *alpSrcPtr : NULL,
+                                       dest, dstW, chrAlpha, dstFormat, flags, dstY);
+                    }
+                } else if (vLumFilterSize == 2 && vChrFilterSize == 2) { //bilinear upscale RGB
+                    int lumAlpha= vLumFilter[2*dstY+1];
+                    int chrAlpha= vChrFilter[2*dstY+1];
+                    lumMmxFilter[2]=
+                    lumMmxFilter[3]= vLumFilter[2*dstY   ]*0x10001;
+                    chrMmxFilter[2]=
+                    chrMmxFilter[3]= vChrFilter[2*chrDstY]*0x10001;
+                    if(flags & SWS_FULL_CHR_H_INT) {
+                        yuv2rgbXinC_full(c, //FIXME write a packed2_full function
+                                         vLumFilter+dstY*vLumFilterSize, lumSrcPtr, vLumFilterSize,
+                                         vChrFilter+dstY*vChrFilterSize, chrSrcPtr, vChrFilterSize,
+                                         alpSrcPtr, dest, dstW, dstY);
+                    } else {
+                        c->yuv2packed2(c, *lumSrcPtr, *(lumSrcPtr+1), *chrSrcPtr, *(chrSrcPtr+1),
+                                       alpPixBuf ? *alpSrcPtr : NULL, alpPixBuf ? *(alpSrcPtr+1) : NULL,
+                                       dest, dstW, lumAlpha, chrAlpha, dstY);
+                    }
+                } else { //general RGB
+                    if(flags & SWS_FULL_CHR_H_INT) {
+                        yuv2rgbXinC_full(c,
+                                         vLumFilter+dstY*vLumFilterSize, lumSrcPtr, vLumFilterSize,
+                                         vChrFilter+dstY*vChrFilterSize, chrSrcPtr, vChrFilterSize,
+                                         alpSrcPtr, dest, dstW, dstY);
+                    } else {
+                        c->yuv2packedX(c,
+                                       vLumFilter+dstY*vLumFilterSize, lumSrcPtr, vLumFilterSize,
+                                       vChrFilter+dstY*vChrFilterSize, chrSrcPtr, vChrFilterSize,
+                                       alpSrcPtr, dest, dstW, dstY);
+                    }
+                }
+            }
+        } else { // hmm looks like we can't use MMX here without overwriting this array's tail
+            const int16_t **lumSrcPtr= (const int16_t **)lumPixBuf + lumBufIndex + firstLumSrcY - lastInLumBuf + vLumBufSize;
+            const int16_t **chrSrcPtr= (const int16_t **)chrPixBuf + chrBufIndex + firstChrSrcY - lastInChrBuf + vChrBufSize;
+            const int16_t **alpSrcPtr= (CONFIG_SWSCALE_ALPHA && alpPixBuf) ? (const int16_t **)alpPixBuf + lumBufIndex + firstLumSrcY - lastInLumBuf + vLumBufSize : NULL;
+            if (dstFormat == PIX_FMT_NV12 || dstFormat == PIX_FMT_NV21) {
+                const int chrSkipMask= (1<<c->chrDstVSubSample)-1;
+                if (dstY&chrSkipMask) uDest= NULL; //FIXME split functions in lumi / chromi
+                yuv2nv12XinC(
+                             vLumFilter+dstY*vLumFilterSize   , lumSrcPtr, vLumFilterSize,
+                             vChrFilter+chrDstY*vChrFilterSize, chrSrcPtr, vChrFilterSize,
+                             dest, uDest, dstW, chrDstW, dstFormat);
+            } else if (isPlanarYUV(dstFormat) || dstFormat==PIX_FMT_GRAY8) { //YV12
+                const int chrSkipMask= (1<<c->chrDstVSubSample)-1;
+                if ((dstY&chrSkipMask) || isGray(dstFormat)) uDest=vDest= NULL; //FIXME split functions in lumi / chromi
+                if (is16BPS(dstFormat)) {
+                    yuv2yuvX16inC(
+                                  vLumFilter+dstY*vLumFilterSize   , lumSrcPtr, vLumFilterSize,
+                                  vChrFilter+chrDstY*vChrFilterSize, chrSrcPtr, vChrFilterSize,
+                                  alpSrcPtr, (uint16_t *) dest, (uint16_t *) uDest, (uint16_t *) vDest, (uint16_t *) aDest, dstW, chrDstW,
+                                  dstFormat);
+                } else {
+                    yuv2yuvXinC(
+                                vLumFilter+dstY*vLumFilterSize   , lumSrcPtr, vLumFilterSize,
+                                vChrFilter+chrDstY*vChrFilterSize, chrSrcPtr, vChrFilterSize,
+                                alpSrcPtr, dest, uDest, vDest, aDest, dstW, chrDstW);
+                }
+            } else {
+                assert(lumSrcPtr + vLumFilterSize - 1 < lumPixBuf + vLumBufSize*2);
+                assert(chrSrcPtr + vChrFilterSize - 1 < chrPixBuf + vChrBufSize*2);
+                if(flags & SWS_FULL_CHR_H_INT) {
+                    yuv2rgbXinC_full(c,
+                                     vLumFilter+dstY*vLumFilterSize, lumSrcPtr, vLumFilterSize,
+                                     vChrFilter+dstY*vChrFilterSize, chrSrcPtr, vChrFilterSize,
+                                     alpSrcPtr, dest, dstW, dstY);
+                } else {
+                    yuv2packedXinC(c,
+                                   vLumFilter+dstY*vLumFilterSize, lumSrcPtr, vLumFilterSize,
+                                   vChrFilter+dstY*vChrFilterSize, chrSrcPtr, vChrFilterSize,
+                                   alpSrcPtr, dest, dstW, dstY);
+                }
+            }
+        }
+    }
+
+    if ((dstFormat == PIX_FMT_YUVA420P) && !alpPixBuf)
+        fillPlane(dst[3], dstStride[3], dstW, dstY-lastDstY, lastDstY, 255);
+
+    /* store changed local vars back in the context */
+    c->dstY= dstY;
+    c->lumBufIndex= lumBufIndex;
+    c->chrBufIndex= chrBufIndex;
+    c->lastInLumBuf= lastInLumBuf;
+    c->lastInChrBuf= lastInChrBuf;
+
+    return dstY - lastDstY;
+}
+
+static void RENAME(sws_init_swScale)(SwsContext *c)
+{
+    enum PixelFormat srcFormat = c->srcFormat;
+
+    c->yuv2nv12X    = RENAME(yuv2nv12X   );
+    c->yuv2yuv1     = RENAME(yuv2yuv1    );
+    c->yuv2yuvX     = RENAME(yuv2yuvX    );
+    c->yuv2packed1  = RENAME(yuv2packed1 );
+    c->yuv2packed2  = RENAME(yuv2packed2 );
+    c->yuv2packedX  = RENAME(yuv2packedX );
+
+    c->hScale       = RENAME(hScale      );
+
+    if (c->flags & SWS_FAST_BILINEAR)
+    {
+        c->hyscale_fast = RENAME(hyscale_fast);
+        c->hcscale_fast = RENAME(hcscale_fast);
+    }
+
+    c->chrToYV12 = NULL;
+    switch(srcFormat) {
+        case PIX_FMT_YUYV422  : c->chrToYV12 = RENAME(yuy2ToUV); break;
+        case PIX_FMT_UYVY422  : c->chrToYV12 = RENAME(uyvyToUV); break;
+        case PIX_FMT_NV12     : c->chrToYV12 = RENAME(nv12ToUV); break;
+        case PIX_FMT_NV21     : c->chrToYV12 = RENAME(nv21ToUV); break;
+        case PIX_FMT_RGB8     :
+        case PIX_FMT_BGR8     :
+        case PIX_FMT_PAL8     :
+        case PIX_FMT_BGR4_BYTE:
+        case PIX_FMT_RGB4_BYTE: c->chrToYV12 = palToUV; break;
+        case PIX_FMT_YUV420P16BE:
+        case PIX_FMT_YUV422P16BE:
+        case PIX_FMT_YUV444P16BE: c->chrToYV12 = RENAME(BEToUV); break;
+        case PIX_FMT_YUV420P16LE:
+        case PIX_FMT_YUV422P16LE:
+        case PIX_FMT_YUV444P16LE: c->chrToYV12 = RENAME(LEToUV); break;
+    }
+    if (c->chrSrcHSubSample) {
+        switch(srcFormat) {
+        case PIX_FMT_RGB48BE:
+        case PIX_FMT_RGB48LE: c->chrToYV12 = rgb48ToUV_half; break;
+        case PIX_FMT_RGB32  : c->chrToYV12 = bgr32ToUV_half;  break;
+        case PIX_FMT_RGB32_1: c->chrToYV12 = bgr321ToUV_half; break;
+        case PIX_FMT_BGR24  : c->chrToYV12 = RENAME(bgr24ToUV_half); break;
+        case PIX_FMT_BGR565 : c->chrToYV12 = bgr16ToUV_half; break;
+        case PIX_FMT_BGR555 : c->chrToYV12 = bgr15ToUV_half; break;
+        case PIX_FMT_BGR32  : c->chrToYV12 = rgb32ToUV_half;  break;
+        case PIX_FMT_BGR32_1: c->chrToYV12 = rgb321ToUV_half; break;
+        case PIX_FMT_RGB24  : c->chrToYV12 = RENAME(rgb24ToUV_half); break;
+        case PIX_FMT_RGB565 : c->chrToYV12 = rgb16ToUV_half; break;
+        case PIX_FMT_RGB555 : c->chrToYV12 = rgb15ToUV_half; break;
+        }
+    } else {
+        switch(srcFormat) {
+        case PIX_FMT_RGB48BE:
+        case PIX_FMT_RGB48LE: c->chrToYV12 = rgb48ToUV; break;
+        case PIX_FMT_RGB32  : c->chrToYV12 = bgr32ToUV;  break;
+        case PIX_FMT_RGB32_1: c->chrToYV12 = bgr321ToUV; break;
+        case PIX_FMT_BGR24  : c->chrToYV12 = RENAME(bgr24ToUV); break;
+        case PIX_FMT_BGR565 : c->chrToYV12 = bgr16ToUV; break;
+        case PIX_FMT_BGR555 : c->chrToYV12 = bgr15ToUV; break;
+        case PIX_FMT_BGR32  : c->chrToYV12 = rgb32ToUV;  break;
+        case PIX_FMT_BGR32_1: c->chrToYV12 = rgb321ToUV; break;
+        case PIX_FMT_RGB24  : c->chrToYV12 = RENAME(rgb24ToUV); break;
+        case PIX_FMT_RGB565 : c->chrToYV12 = rgb16ToUV; break;
+        case PIX_FMT_RGB555 : c->chrToYV12 = rgb15ToUV; break;
+        }
+    }
+
+    c->lumToYV12 = NULL;
+    c->alpToYV12 = NULL;
+    switch (srcFormat) {
+    case PIX_FMT_YUYV422  :
+    case PIX_FMT_YUV420P16BE:
+    case PIX_FMT_YUV422P16BE:
+    case PIX_FMT_YUV444P16BE:
+    case PIX_FMT_Y400A    :
+    case PIX_FMT_GRAY16BE : c->lumToYV12 = RENAME(yuy2ToY); break;
+    case PIX_FMT_UYVY422  :
+    case PIX_FMT_YUV420P16LE:
+    case PIX_FMT_YUV422P16LE:
+    case PIX_FMT_YUV444P16LE:
+    case PIX_FMT_GRAY16LE : c->lumToYV12 = RENAME(uyvyToY); break;
+    case PIX_FMT_BGR24    : c->lumToYV12 = RENAME(bgr24ToY); break;
+    case PIX_FMT_BGR565   : c->lumToYV12 = bgr16ToY; break;
+    case PIX_FMT_BGR555   : c->lumToYV12 = bgr15ToY; break;
+    case PIX_FMT_RGB24    : c->lumToYV12 = RENAME(rgb24ToY); break;
+    case PIX_FMT_RGB565   : c->lumToYV12 = rgb16ToY; break;
+    case PIX_FMT_RGB555   : c->lumToYV12 = rgb15ToY; break;
+    case PIX_FMT_RGB8     :
+    case PIX_FMT_BGR8     :
+    case PIX_FMT_PAL8     :
+    case PIX_FMT_BGR4_BYTE:
+    case PIX_FMT_RGB4_BYTE: c->lumToYV12 = palToY; break;
+    case PIX_FMT_MONOBLACK: c->lumToYV12 = monoblack2Y; break;
+    case PIX_FMT_MONOWHITE: c->lumToYV12 = monowhite2Y; break;
+    case PIX_FMT_RGB32  : c->lumToYV12 = bgr32ToY;  break;
+    case PIX_FMT_RGB32_1: c->lumToYV12 = bgr321ToY; break;
+    case PIX_FMT_BGR32  : c->lumToYV12 = rgb32ToY;  break;
+    case PIX_FMT_BGR32_1: c->lumToYV12 = rgb321ToY; break;
+    case PIX_FMT_RGB48BE:
+    case PIX_FMT_RGB48LE: c->lumToYV12 = rgb48ToY; break;
+    }
+    if (c->alpPixBuf) {
+        switch (srcFormat) {
+        case PIX_FMT_RGB32  :
+        case PIX_FMT_RGB32_1:
+        case PIX_FMT_BGR32  :
+        case PIX_FMT_BGR32_1: c->alpToYV12 = abgrToA; break;
+        case PIX_FMT_Y400A  : c->alpToYV12 = RENAME(yuy2ToY); break;
+        }
+    }
+
+    switch (srcFormat) {
+    case PIX_FMT_Y400A  :
+        c->alpSrcOffset = 1;
+        break;
+    case PIX_FMT_RGB32  :
+    case PIX_FMT_BGR32  :
+        c->alpSrcOffset = 3;
+        break;
+    case PIX_FMT_RGB48LE:
+        c->lumSrcOffset = 1;
+        c->chrSrcOffset = 1;
+        c->alpSrcOffset = 1;
+        break;
+    }
+
+    if (c->srcRange != c->dstRange && !isAnyRGB(c->dstFormat)) {
+        if (c->srcRange) {
+            c->lumConvertRange = RENAME(lumRangeFromJpeg);
+            c->chrConvertRange = RENAME(chrRangeFromJpeg);
+        } else {
+            c->lumConvertRange = RENAME(lumRangeToJpeg);
+            c->chrConvertRange = RENAME(chrRangeToJpeg);
+        }
+    }
+
+    if (!(isGray(srcFormat) || isGray(c->dstFormat) ||
+          srcFormat == PIX_FMT_MONOBLACK || srcFormat == PIX_FMT_MONOWHITE))
+        c->needs_hcscale = 1;
+}