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Viewing changes to src/tools/tileset_borderfix.c

  • Committer: Bazaar Package Importer
  • Author(s): Jack Coulter
  • Date: 2008-04-13 18:48:12 UTC
  • Revision ID: james.westby@ubuntu.com-20080413184812-efc80waq2er6p1bs
Tags: upstream-0.4.2
Import upstream version 0.4.2

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src/tools/tileset_borderfix.c
 
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/* copyright (c) 2007 magnus auvinen, see licence.txt for more info */
 
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#include "../engine/external/pnglite/pnglite.c"
 
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typedef struct pixel_t
 
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{
 
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        unsigned char r, g, b, a;
 
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} pixel;
 
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static pixel sample(int x, int y, int w, int h, pixel *data, int pitch, float u, float v)
 
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{
 
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        x = x + (int)(w*u);
 
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        y = y + (int)(h*v);
 
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        return data[y*pitch+x];
 
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}
 
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static void tilemap_borderfix(int w, int h, pixel *src, pixel *dst)
 
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{
 
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        int tilew = w/16;
 
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        int tileh = h/16;
 
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        int tx, ty;
 
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        int x, y;
 
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        int k;
 
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        float u, v;
 
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        memset(dst, 0, sizeof(pixel)*w*h);
 
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        for(ty = 0; ty < 16; ty++)
 
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                for(tx = 0; tx < 16; tx++)
 
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                {
 
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                        for(y = 0; y < tileh-2; y++)
 
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                                for(x = 0; x < tilew-2; x++)
 
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                                {
 
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                                        u = 0.5f/tilew + x/(float)(tilew-2);
 
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                                        v = 0.5f/tileh + y/(float)(tileh-2);
 
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                                        k = (ty*tileh+1+y)*w + tx*tilew+x+1;
 
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                                        dst[k] = sample(tx*tilew, ty*tileh, tilew, tileh, src, w, u, v);
 
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                                        if(x == 0) dst[k-1] = dst[k];
 
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                                        if(x == tilew-2-1) dst[k+1] = dst[k];
 
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                                        if(y == 0) dst[k-w] = dst[k];
 
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                                        if(y == tileh-2-1) dst[k+w] = dst[k];
 
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                                        if(x == 0 && y == 0) dst[k-w-1] = dst[k];
 
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                                        if(x == tilew-2-1 && y == 0) dst[k-w+1] = dst[k];
 
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                                        if(x == 0 && y == tileh-2-1) dst[k+w-1] = dst[k];
 
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                                        if(x == tilew-2-1 && y == tileh-2-1) dst[k+w+1] = dst[k];
 
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                                }
 
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                }
 
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}
 
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int main(int argc, char **argv)
 
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{
 
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        png_t png;
 
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        pixel *buffer[2] = {0,0};
 
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        int w, h;
 
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        png_init(0,0);
 
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        png_open_file(&png, argv[1]);
 
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        if(png.color_type != PNG_TRUECOLOR_ALPHA)
 
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        {
 
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                printf("not an RGBA image\n");
 
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                return -1;
 
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        }
 
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        w = png.width;
 
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        h = png.height;
 
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        buffer[0] = (pixel*)malloc(w*h*sizeof(pixel));
 
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        buffer[1] = (pixel*)malloc(w*h*sizeof(pixel));
 
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        png_get_data(&png, (unsigned char *)buffer[0]);
 
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        png_close_file(&png);
 
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        tilemap_borderfix(w, h, buffer[0], buffer[1]);
 
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        // save here
 
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        png_open_file_write(&png, argv[1]);
 
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        png_set_data(&png, w, h, 8, PNG_TRUECOLOR_ALPHA, (unsigned char *)buffer[1]);
 
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        png_close_file(&png);
 
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        return 0;
 
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}