| 1 | /********************************************************************** <BR>
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| 2 | This file is part of Crack dot Com's free source code release of
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| 3 | Golgotha. <a href="http://www.crack.com/golgotha_release"> <BR> for
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| 4 | information about compiling & licensing issues visit this URL</a>
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| 5 | <PRE> If that doesn't help, contact Jonathan Clark at
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| 6 | golgotha_source@usa.net (Subject should have "GOLG" in it)
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| 7 | ***********************************************************************/
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| 8 |
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| 9 | #include "image/image.hh"
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| 10 | #include "error/error.hh"
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| 11 | #include "memory/malloc.hh"
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| 12 | #include "image/context.hh"
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| 13 | #include <memory.h>
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| 14 |
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| 15 | inline void argb_split(w32 c, int &a, int &r, int &g, int &b)
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| 16 | {
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| 17 | a=(c&0xff000000)>>24;
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| 18 | r=(c&0xff0000)>>16;
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| 19 | g=(c&0xff00)>>8;
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| 20 | b=(c&0xff)>>0;
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| 21 | }
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| 22 |
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| 23 | inline w32 pack_argb(int a, int r, int g, int b)
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| 24 | {
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| 25 | return (a<<24) | (r<<16) | (g<<8) | b;
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| 26 | }
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| 27 |
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| 28 | void i4_dither_quantize(i4_image_class *source, i4_image_class *dest)
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| 29 | {
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| 30 | int w=source->width(), h=source->height(), x,y;
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| 31 |
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| 32 | I4_ASSERT(source && dest && w==dest->width() && h==dest->height(), "source size !=dest");
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| 33 |
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| 34 | int size=(w+1)*(h+1)*4;
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| 35 | w32 *er_im=(w32 *)i4_malloc(size,"");
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| 36 | memset(er_im, 0, size);
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| 37 | w32 *cur_er=er_im;
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| 38 |
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| 39 | i4_draw_context_class context(0,0, w-1, h-1);
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| 40 | for (y=0; y<h; y++)
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| 41 | {
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| 42 | for (x=0; x<w; x++, cur_er++)
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| 43 | {
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| 44 | w32 c=source->get_pixel(x,y, context);
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| 45 | int r,g,b,a, ea,er,eg,eb;
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| 46 |
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| 47 | argb_split(c, a,r,g,b);
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| 48 | argb_split(*cur_er, ea, er, eg,eb);
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| 49 |
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| 50 | ea-=127; er-=127; eg-=127; eb-=127;
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| 51 |
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| 52 | a+=ea; if (a<0) a=0; if (a>255) a=255;
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| 53 | r+=er; if (r<0) r=0; if (r>255) r=255;
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| 54 | g+=eg; if (g<0) g=0; if (g>255) g=255;
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| 55 | b+=eb; if (b<0) b=0; if (b>255) b=255;
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| 56 |
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| 57 |
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| 58 | dest->put_pixel(x,y, pack_argb(a,r,g,b), context);
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| 59 | w32 d=dest->get_pixel(x,y, context); // see what the differance is
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| 60 | argb_split(d, ea, er, eg, eb);
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| 61 |
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| 62 | ea-=a;
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| 63 | er-=r;
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| 64 | eg-=g;
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| 65 | eb-=b;
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| 66 |
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| 67 | cur_er[1]+=pack_argb( (ea/4)+127, (er/4)+127, (eg/4)+127, (eb/4)+127);
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| 68 | cur_er[w+1]+=pack_argb( (ea/2)+127, (er/2)+127, (eg/2)+127, (eb/2)+127);
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| 69 | cur_er[w+1+1]+=pack_argb( (ea/4)+127, (er/4)+127, (eg/4)+127, (eb/4)+127);
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| 70 | }
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| 71 |
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| 72 | cur_er++;
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| 73 | }
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| 74 |
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| 75 | i4_free(er_im);
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| 76 | }
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| 77 |
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