56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
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/*
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Test of the LZ4 decompression library
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with a hires graphics image.
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*/
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// CC65 config, reserves space for the HGR1 screen buffer
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#define CFGFILE apple2-hgr.cfg
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#pragma data-name(push,"HGR")
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// this segment is required, but we leave it empty
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// since we're going to decompress the image here
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#pragma data-name(pop)
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#include <stdlib.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <conio.h>
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#include <string.h>
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#include <apple2.h>
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#include <peekpoke.h>
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#include <lz4.h>
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// STROBE = write any value to an I/O address
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#define STROBE(addr) __asm__ ("sta %w", addr)
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// start address of the two hi-res graphics regions
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#define HGR1 0x2000
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#define HGR2 0x4000
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// the LZ4 compressed data
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const unsigned char BITMAP_DATA_LZ4[] = {
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#embed "parrot-apple2.hires.lz4"
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};
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// clear screen and set graphics mode
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void clear_hgr1() {
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memset((char*)HGR1, 0, 0x2000); // clear page 1
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STROBE(0xc052); // turn off mixed-mode
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STROBE(0xc054); // page 1
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STROBE(0xc057); // hi-res
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STROBE(0xc050); // set graphics mode
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}
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int main (void)
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{
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// set hgr1 mode and clear
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clear_hgr1();
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// skip the header (usually 11 bytes)
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decompress_lz4(BITMAP_DATA_LZ4+11, (char*)HGR1, 0x2000);
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// wait for a key
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cgetc();
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return EXIT_SUCCESS;
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}
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