gfx_put_custom.c

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/* CUSTOM drawing method for PUT statement */

#include "fb_gfx.h"


/*:::::*/
static void fb_hPutCustom1(unsigned char *src, unsigned char *dest, int w, int h, int src_pitch, int dest_pitch, int alpha, BLENDER *blender, void *param)
{
        unsigned char *s = (unsigned char *)src;
        unsigned char *d;
        int x;
        
        src_pitch -= w;
        for (; h; h--) {
                d = (unsigned char *)dest;
                for (x = w; x; x--) {
                        *d = (unsigned char)blender((unsigned int)*s, (unsigned int)*d, param);
                        s++;
                        d++;
                }
                s += src_pitch;
                dest += dest_pitch;
        }
}


/*:::::*/
static void fb_hPutCustom2(unsigned char *src, unsigned char *dest, int w, int h, int src_pitch, int dest_pitch, int alpha, BLENDER *blender, void *param)
{
        unsigned short *s = (unsigned short *)src;
        unsigned short *d;
        int x;
        unsigned int cs, cd;
        
        src_pitch = (src_pitch >> 1) - w;
        for (; h; h--) {
                d = (unsigned short *)dest;
                for (x = w; x; x--) {
                        cs = *s++;
                        cs = (((cs & 0x001F) << 3) | ((cs >> 2) & 0x7) |
                              ((cs & 0x07E0) << 5) | ((cs >> 1) & 0x300) |
                              ((cs & 0xF800) << 8) | ((cs << 3) & 0x70000));
                        cd = *d;
                        cd = (((cd & 0x001F) << 3) | ((cd >> 2) & 0x7) |
                              ((cd & 0x07E0) << 5) | ((cd >> 1) & 0x300) |
                              ((cd & 0xF800) << 8) | ((cd << 3) & 0x70000));
                        cd = blender(cs, cd, param);
                        *d++ = (unsigned short)((cd >> 3) & 0x001F) | ((cd >> 5) & 0x07E0) | ((cd >> 8) & 0xF800);
                }
                s += src_pitch;
                dest += dest_pitch;
        }
}


/*:::::*/
static void fb_hPutCustom4(unsigned char *src, unsigned char *dest, int w, int h, int src_pitch, int dest_pitch, int alpha, BLENDER *blender, void *param)
{
        unsigned int *s = (unsigned int *)src;
        unsigned int *d;
        int x;
        
        src_pitch = (src_pitch >> 2) - w;
        for (; h; h--) {
                d = (unsigned int *)dest;
                for (x = w; x; x--) {
                        *d = blender(*s, *d, param);
                        s++;
                        d++;
                }
                s += src_pitch;
                dest += dest_pitch;
        }
}


/*:::::*/
void fb_hPutCustom(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_hPutCustom1, fb_hPutCustom2, NULL, fb_hPutCustom4,
        };
        PUTTER *putter;
        FB_GFXCTX *context = fb_hGetContext();
        
        if (!context->putter[PUT_MODE_CUSTOM]) {
                context->putter[PUT_MODE_CUSTOM] = &all_putters[0];
        }
        putter = context->putter[PUT_MODE_CUSTOM][context->target_bpp - 1];
        
        putter(src, dest, w, h, src_pitch, dest_pitch, alpha, blender, param);
}