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103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
/* Palette handling part of the Super VMW Graphics Library */
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#include "svmwgraph.h"
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#include <stdio.h> /* for printf */
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#include <unistd.h> /* for usleep */
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void vmwLoadPalette(vmwSVMWGraphState *state,unsigned char r,
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unsigned char g,
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unsigned char b,int color) {
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state->actual_pal[color].r=r;
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state->actual_pal[color].g=g;
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state->actual_pal[color].b=b;
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/* 565 color cube */
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/* which can be LESS colorful than 8bpp. Imagine that */
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state->palette[color]= ( ((int)(r>>3)) <<11)+
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( ((int)(g>>2)) <<5)+
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(b>>3);
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}
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int faded_pal[256];
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int already_faded=0;
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void vmwFadeToBlack(vmwSVMWGraphState *state, vmwVisual *source,
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int justLoadPal) {
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int i,j;
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int r[256],g[256],b[256];
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for (i=0;i<256;i++) faded_pal[i]=state->palette[i];
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if (justLoadPal) {
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already_faded=1;
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return;
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}
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if (already_faded) printf("Warning! Fading already faded screen!\n");
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for(i=0;i<256;i++) {
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r[i]=(state->palette[i])>>11;
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g[i]=(state->palette[i]>>5)&0x3f;
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b[i]=(state->palette[i]&0x1f);
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}
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for(i=0;i<32;i++) {
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for(j=0;j<256;j++) {
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r[j]-=2;
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if (r[j]<0) r[j]=0;
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b[j]-=2;
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if (b[j]<0) b[j]=0;
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g[j]-=4; /* g has an extra bit */
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if (g[j]<0) g[j]=0;
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state->palette[j]=(r[j]<<11)+(g[j]<<5)+b[j];
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}
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vmwFlushPalette(state);
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vmwBlitMemToDisplay(state,source);
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usleep(10000);
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}
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already_faded=1;
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}
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void vmwUnFade(vmwSVMWGraphState *state,vmwVisual *source) {
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int i,j;
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unsigned char r_max[256],g_max[256],b_max[256],
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r[256],g[256],b[256];
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if (!already_faded) printf("Warning! Unfading random palette!\n");
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for(i=0;i<256;i++) {
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r_max[i]=(faded_pal[i])>>11;
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g_max[i]=(faded_pal[i]>>5)&0x3f;
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b_max[i]=(faded_pal[i]&0x1f);
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r[i]=g[i]=b[i]=0;
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}
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for(i=0;i<32;i++) {
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for(j=0;j<256;j++) {
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r[j]+=2;
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if (r[j]>r_max[j]) r[j]=r_max[j];
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b[j]+=2;
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if (b[j]>b_max[j]) b[j]=b_max[j];
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g[j]+=4; /* g has an extra bit */
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if (g[j]>g_max[j]) g[j]=g_max[j];
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state->palette[j]=(r[j]<<11)+(g[j]<<5)+b[j];
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}
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vmwFlushPalette(state);
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vmwBlitMemToDisplay(state,source);
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usleep(10000);
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}
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}
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