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rgbimage.c
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rgbimage.c
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#include "rgbimage.h"
#include <c64/vic.h>
void rgbimg_begin(void)
{
vic.ctrl1 = VIC_CTRL1_BMM | VIC_CTRL1_DEN | VIC_CTRL1_RSEL | 3;
vic.ctrl2 = VIC_CTRL2_MCM | VIC_CTRL2_CSEL;
vic.color_back = VCOL_BLACK;
vic.color_border = VCOL_BLACK;
vic_setbank(3);
vic.memptr = 0x28;
}
void rgbimg_end(void)
{
vic.ctrl1 = VIC_CTRL1_DEN | VIC_CTRL1_RSEL | 3;
vic.ctrl2 = VIC_CTRL2_CSEL;
vic.color_back = VCOL_BLACK;
vic_setbank(0);
vic.memptr = 0x14;
}
#define Screen ((byte *)0xc800)
#define Color ((byte *)0xd800)
#define Hires ((byte *)0xe000)
char block[8][4], color[4];
RGBA rgbblock[8][4];
RGBA rgbpalette[4];
RGBA basepalette[16] =
{
{ 0x00, 0x00, 0x00 },
{ 0xFF, 0xFF, 0xFF },
{ 0x68, 0x37, 0x2B },
{ 0x70, 0xA4, 0xB2 },
{ 0x6F, 0x3D, 0x86 },
{ 0x58, 0x8D, 0x43 },
{ 0x35, 0x28, 0x79 },
{ 0xB8, 0xC7, 0x6F },
{ 0x6F, 0x4F, 0x25 },
{ 0x43, 0x39, 0x00 },
{ 0x9A, 0x67, 0x59 },
{ 0x44, 0x44, 0x44 },
{ 0x6C, 0x6C, 0x6C },
{ 0x9A, 0xD2, 0x84 },
{ 0x6C, 0x5E, 0xB5 },
{ 0x95, 0x95, 0x95 }
};
void rgbimg_putblock(char x, char y)
{
char * hp = Hires + 320 * y + 8 * x;
for(char i=0; i<8; i++)
hp[i] = (((((block[i][0] << 2) | block[i][1]) << 2) | block[i][2]) << 2) | block[i][3];
Screen[x + 40 * y] = (color[1] << 4) | color[2];
Color[x + 40 * y] = color[3];
}
static inline char dist(char a, char b)
{
return a > b ? a - b : b - a;
}
char rgbimg_mapcolor(RGBA c)
{
char ei = dist(c.r, rgbpalette[0].r) + dist(c.g, rgbpalette[0].g) + dist(c.b, rgbpalette[0].b);
char ci = 0;
for(char i=1; i<4; i++)
{
char e = dist(c.r, rgbpalette[i].r) + dist(c.g, rgbpalette[i].g) + dist(c.b, rgbpalette[i].b);
if (e < ei)
{
ei = e;
ci = i;
}
}
return ci;
}
static unsigned mapcolordist(RGBA c, char n)
{
char ei = dist(c.r, rgbpalette[0].r) + dist(c.g, rgbpalette[0].g) + dist(c.b, rgbpalette[0].b);
for(char i=1; i<n; i++)
{
char e = dist(c.r, rgbpalette[i].r) + dist(c.g, rgbpalette[i].g) + dist(c.b, rgbpalette[i].b);
if (e < ei)
ei = e;
}
return ei;
}
char paldist[16][32];
char pdist[32];
void rgbimg_buildpal(void)
{
for(char j=0; j<16; j++)
{
for(char i=0; i<32; i++)
{
paldist[j][i] =
dist(rgbblock[0][i].r, basepalette[j].r) +
dist(rgbblock[0][i].g, basepalette[j].g) +
dist(rgbblock[0][i].b, basepalette[j].b);
}
}
for(char i=0; i<32; i++)
pdist[i] = paldist[0][i];
color[0] = 0;
rgbpalette[0] = basepalette[0];
for(char i=1; i<4; i++)
{
unsigned dmax = 65535;
char jmax = 0;
for(char j=1; j<16; j++)
{
unsigned dsum = 0;
for(char k=0; k<32; k++)
{
char ei = pdist[k];
char e = paldist[j][k];
if (e < ei)
ei = e;
dsum += ei;
}
if (dsum < dmax)
{
dmax = dsum;
jmax = j;
}
}
color[i] = jmax;
rgbpalette[i] = basepalette[jmax];
for(char k=0; k<32; k++)
{
char ei = pdist[k];
char e = paldist[jmax][k];
if (e < ei)
pdist[k] = e;
}
}
}
static char correct1(char a, char m, char d)
{
int k = (int)d + a - m;
if (k < 0)
return 0;
else if (k > 255)
return 255;
else
return k;
}
static char correct2(char a, char m, char d)
{
int k = ((int)d + d + a - m) >> 1;
if (k < 0)
return 0;
else if (k > 255)
return 255;
else
return k;
}
static char correct4(char a, char m, char d)
{
int k = ((int)d * 4 + a - m) >> 2;
if (k < 0)
return 0;
else if (k > 255)
return 255;
else
return k;
}
static inline char noise(char a)
{
return (a + (rand() & 63)) >> 2;
}
void rgbimg_noisergb(RGBA * rgba)
{
rgba->r = noise(rgba->r);
rgba->g = noise(rgba->g);
rgba->b = noise(rgba->b);
}
void rgbimg_noiseblock(void)
{
for(char y=0; y<8; y++)
{
for(char x=0; x<4; x++)
{
rgbimg_noisergb(&(rgbblock[y][x]));
}
}
}
void rgbimg_mapblock(void)
{
for(char y=0; y<8; y+=2)
{
for(char x=0; x<4; x+=2)
{
RGBA rgb0 = rgbblock[y + 0][x + 0];
RGBA rgb1 = rgbblock[y + 1][x + 1];
RGBA rgb2 = rgbblock[y + 0][x + 1];
RGBA rgb3 = rgbblock[y + 1][x + 0];
char c0 = rgbimg_mapcolor(rgb0);
block[y + 0][x + 0] = c0;
rgb1.r = correct2(rgb0.r, rgbpalette[c0].r, rgb1.r);
rgb1.g = correct2(rgb0.g, rgbpalette[c0].g, rgb1.g);
rgb1.b = correct2(rgb0.b, rgbpalette[c0].b, rgb1.b);
rgb2.r = correct4(rgb0.r, rgbpalette[c0].r, rgb2.r);
rgb2.g = correct4(rgb0.g, rgbpalette[c0].g, rgb2.g);
rgb2.b = correct4(rgb0.b, rgbpalette[c0].b, rgb2.b);
rgb3.r = correct4(rgb0.r, rgbpalette[c0].r, rgb3.r);
rgb3.g = correct4(rgb0.g, rgbpalette[c0].g, rgb3.g);
rgb3.b = correct4(rgb0.b, rgbpalette[c0].b, rgb3.b);
char c1 = rgbimg_mapcolor(rgb1);
block[y + 1][x + 1] = c1;
rgb2.r = correct2(rgb1.r, rgbpalette[c1].r, rgb2.r);
rgb2.g = correct2(rgb1.g, rgbpalette[c1].g, rgb2.g);
rgb2.b = correct2(rgb1.b, rgbpalette[c1].b, rgb2.b);
rgb3.r = correct2(rgb1.r, rgbpalette[c1].r, rgb3.r);
rgb3.g = correct2(rgb1.g, rgbpalette[c1].g, rgb3.g);
rgb3.b = correct2(rgb1.b, rgbpalette[c1].b, rgb3.b);
char c2 = rgbimg_mapcolor(rgb2);
block[y + 0][x + 1] = c2;
rgb3.r = correct1(rgb2.r, rgbpalette[c2].r, rgb3.r);
rgb3.g = correct1(rgb2.g, rgbpalette[c2].g, rgb3.g);
rgb3.b = correct1(rgb2.b, rgbpalette[c2].b, rgb3.b);
char c3 = rgbimg_mapcolor(rgb3);
block[y + 1][x + 0] = c3;
}
}
}