mirror of
https://github.com/yourtion/30dayMakeOS.git
synced 2026-02-12 06:15:04 +08:00
122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
#include "apilib.h"
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struct DLL_STRPICENV { /* 64KB */
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int work[64 * 1024 / 4];
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};
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struct RGB {
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unsigned char b, g, r, t;
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};
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/* bmp.nasm */
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int info_BMP(struct DLL_STRPICENV *env, int *info, int size, char *fp);
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int decode0_BMP(struct DLL_STRPICENV *env, int size, char *fp, int b_type, char *buf, int skip);
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/* jpeg.c */
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int info_JPEG(struct DLL_STRPICENV *env, int *info, int size, char *fp);
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int decode0_JPEG(struct DLL_STRPICENV *env, int size, char *fp, int b_type, char *buf, int skip);
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unsigned char rgb2pal(int r, int g, int b, int x, int y);
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void error(char *s);
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void HariMain(void)
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{
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struct DLL_STRPICENV env;
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char filebuf[512 * 1024], winbuf[1040 * 805];
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char s[32], *p;
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int win, i, j, fsize, xsize, info[8];
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struct RGB picbuf[1024 * 768], *q;
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/*命令行解析*/
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api_cmdline(s, 30);
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for (p = s; *p > ' '; p++) { } /*一直读到空格为止*/
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for (; *p == ' '; p++) { } /*跳过空格*/
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/*文件载入*/
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i = api_fopen(p); if (i == 0) { error("file not found.\n"); }
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fsize = api_fsize(i, 0);
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if (fsize > 512 * 1024) {
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error("file too large.\n");
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}
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api_fread(filebuf, fsize, i);
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api_fclose(i);
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/*检查文件类型*/
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if (info_BMP(&env, info, fsize, filebuf) == 0) {
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/*不是BMP */
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if (info_JPEG(&env, info, fsize, filebuf) == 0) {
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/*也不是JPEG */
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api_putstr0("file type unknown.\n");
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api_end();
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}
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}
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/*上面其中一个info函数调用成功的话，info中包含以下信息 */
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/*info[0]：文件类型（1:BMP、2:JPEG）*/
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/*info[1]：颜色数信息*/
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/*info[2]：xsize */
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/* info[3] : ysize */
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if (info[2] > 1024 || info[3] > 768) {
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error("picture too large.\n");
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}
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/*窗口准备*/
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xsize = info[2] + 16;
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if (xsize < 136) {
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xsize = 136;
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}
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win = api_openwin(winbuf, xsize, info[3] + 37, -1, "gview");
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/*将文件内容转换为图像数据*/
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if (info[0] == 1) {
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i = decode0_BMP (&env, fsize, filebuf, 4, (char *) picbuf, 0);
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} else {
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i = decode0_JPEG(&env, fsize, filebuf, 4, (char *) picbuf, 0);
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}
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/*b_type = 4表示struct RGB格式*/
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/*skip设为0即可*/
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if (i != 0) {
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error("decode error.\n");
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}
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/*显示*/
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for (i = 0; i < info[3]; i++) {
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p = winbuf + (i + 29) * xsize + (xsize - info[2]) / 2;
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q = picbuf + i * info[2];
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for (j = 0; j < info[2]; j++) {
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p[j] = rgb2pal(q[j].r, q[j].g, q[j].b, j, i);
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}
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}
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api_refreshwin(win, (xsize - info[2]) / 2, 29, (xsize - info[2]) / 2 + info[2], 29 + info[3]);
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/*等待结束*/
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for (;;) {
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i = api_getkey(1);
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if (i == 'Q' || i == 'q') {
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api_end();
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}
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}
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}
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unsigned char rgb2pal(int r, int g, int b, int x, int y)
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{
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static int table[4] = { 3, 1, 0, 2 };
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int i;
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x &= 1; /*判断是偶数还是奇数*/
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y &= 1;
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i = table[x + y * 2]; /*用于生成中间色的常量*/
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r = (r * 21) / 256; /*结果为0～20*/
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g = (g * 21) / 256;
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b = (b * 21) / 256;
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r = (r + i) / 4; /*结果为0～5*/
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g = (g + i) / 4;
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b = (b + i) / 4;
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return 16 + r + g * 6 + b * 36;
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}
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void error(char *s)
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{
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api_putstr0(s);
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api_end();
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}
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