gfx_put_xor.c

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/* XOR drawing method for PUT statement */

#include "fb_gfx.h"


#ifdef HOST_X86

#include "x86/fb_gfx_mmx.h"

extern void fb_hPutXorMMX(unsigned char *src, unsigned char *dest, int w, int h, int src_pitch, int dest_pitch, int alpha, BLENDER *blender, void *param);

#endif


/*:::::*/
static void fb_hPutXorC(unsigned char *src, unsigned char *dest, int w, int h, int src_pitch, int dest_pitch, int alpha, BLENDER *blender, void *param)
{
        int x;
        FB_GFXCTX *context = fb_hGetContext();
        
        w <<= (context->target_bpp >> 1);
        src_pitch -= w;
        dest_pitch -= w;
        for (; h; h--) {
                if (w & 1)
                        *dest++ ^= *src++;
                if (w & 2) {
                        *(unsigned short *)dest ^= *(unsigned short *)src;
                        dest += 2;
                        src += 2;
                }
                for (x = w >> 2; x; x--) {
                        *(unsigned int *)dest ^= *(unsigned int *)src;
                        dest += 4;
                        src += 4;
                }
                src += src_pitch;
                dest += dest_pitch;
        }
}


/*:::::*/
void fb_hPutXor(unsigned char *src, unsigned char *dest, int w, int h, int src_pitch, int dest_pitch, int alpha, BLENDER *blender, void *param)
{
        static PUTTER *all_putters[] = {
                fb_hPutXorC, fb_hPutXorC, NULL, fb_hPutXorC,
#ifdef HOST_X86
                fb_hPutXorMMX, fb_hPutXorMMX, NULL, fb_hPutXorMMX,
#endif
        };
        PUTTER *putter;
        FB_GFXCTX *context = fb_hGetContext();
        
        if (!context->putter[PUT_MODE_XOR]) {
#ifdef HOST_X86
                if (__fb_gfx->flags & HAS_MMX)
                        context->putter[PUT_MODE_XOR] = &all_putters[4];
                else
#endif
                        context->putter[PUT_MODE_XOR] = &all_putters[0];
        }
        putter = context->putter[PUT_MODE_XOR][context->target_bpp - 1];
        
        putter(src, dest, w, h, src_pitch, dest_pitch, alpha, blender, param);
}