63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <error.h>
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#include "engine.h"
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#include <inttypes.h>
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// TODO: even better compression using zlib or something - or vector graphics
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#define MAX_SPRITES 5000
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static struct sprite sprites[MAX_SPRITES];
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static int numsprites;
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struct sprite *get_decompressed_sprite(const unsigned char *spritedata) {
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for(int i = 0; i < numsprites; i++) {
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if(sprites[i].original_data_source == spritedata)
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return &sprites[i];
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}
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struct sprite *s = &sprites[numsprites++];
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s->width = *(uint16_t*)(spritedata + 0);
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s->height = *(uint16_t*)(spritedata + 2);
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s->original_data_source = spritedata;
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spritedata += 4;
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s->pixels = (uint32_t*)malloc(s->width*s->height*4);
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if(!s->pixels) error(1, 0, "get_decompressed_sprite: memory allocation failed");
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for(int channel = 0; channel < 4; channel++) {
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unsigned char *pixels = (unsigned char*)s->pixels;
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pixels += channel;
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unsigned int pixelsleft = s->width * s->height;
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while(pixelsleft > 0) {
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unsigned char control = *spritedata++;
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if(control & 0x80) {
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control &= 0x7f;
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if(control > pixelsleft) error(1, 0, "corrupted compressed sprite A %u > %u", (unsigned int)control, (unsigned int)pixelsleft);
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for(int i = 0; i < control; i++) {
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*pixels = *spritedata++;
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pixels += 4;
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}
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pixelsleft -= control;
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} else {
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uint32_t count;
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if(control == 0) {
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count = *(uint32_t*)spritedata;
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spritedata += 4;
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} else {
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count = control;
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}
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unsigned char value = *spritedata++;
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if(count > pixelsleft) error(1, 0, "corrupted compressed sprite B %u > %u", (unsigned int)count, (unsigned int)pixelsleft);
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for(uint32_t i = 0; i < count; i++) {
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*pixels = value;
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pixels += 4;
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}
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pixelsleft -= count;
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}
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}
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}
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return s;
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}
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