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-rw-r--r--src/gif.c93
-rw-r--r--src/main.c7
2 files changed, 73 insertions, 27 deletions
diff --git a/src/gif.c b/src/gif.c
index bc3df8c..9f4407e 100644
--- a/src/gif.c
+++ b/src/gif.c
@@ -2,11 +2,15 @@
#include <stdio.h>
#include <string.h>
+#include <assert.h>
+
#include "meh.h"
#define GIF87a 0
#define GIF89a 1
+#define MAX_CODES 4096
+
unsigned char *loadgif(FILE *infile, int *bufwidth, int *bufheight){
int version;
unsigned char *palette;
@@ -89,12 +93,13 @@ unsigned char *loadgif(FILE *infile, int *bufwidth, int *bufheight){
}
buf = malloc((*bufwidth) * (*bufheight) * 3);
+ memset(buf, 0, (*bufwidth) * (*bufheight) * 3);
{
unsigned int initcodesize, curcodesize;
unsigned int clearcode, endcode, newcode;
int bytesleft = 0;
- int i;
+ int i = 0;
/* Get code size */
initcodesize = fgetc(infile);
@@ -108,36 +113,39 @@ unsigned char *loadgif(FILE *infile, int *bufwidth, int *bufheight){
newcode = endcode + 1;
int count = 0;
+ int byte0 = -1, byte1 = -1, byteshift = 0;
+ unsigned int suffix[MAX_CODES * 3];
+ unsigned int prefix[MAX_CODES];
+ int length[MAX_CODES];
+
+ goto clear;
for(;;){
- int byte0 = -1, byte1 = -1, byteshift = 0;
- if(1){
- bytesleft = fgetc(infile);
- printf("%i\n", bytesleft);
- if(bytesleft < 0){
- printf("unexpected EOF (0)\n");
- return NULL;
- }else if(bytesleft == 0)
- break;
- }
- printf("start %i, %i\n", count++, bytesleft);
for(;;){
+ count++;
+ int a, b, c;
int code;
/* get code */
while(byte1 == -1){
+ if(!bytesleft){
+ bytesleft = fgetc(infile);
+ if(bytesleft < 0){
+ printf("unexpected EOF (0)\n");
+ return NULL;
+ }else if(bytesleft == 0)
+ break;
+ }
if((byte1 = fgetc(infile)) == EOF){
printf("unexpected EOF (1)\n");
return NULL;
}
if(byte0 == -1){
byte0 = byte1;
+ byte1 = -1;
}
bytesleft--;
}
- if(bytesleft < 0){
- break;
- }
- code = (byte0 | byte1 << 8) >> byteshift & ((1 << curcodesize) - 1);
+ code = ((byte0 | (byte1 << 8)) >> byteshift) & ((1 << curcodesize) - 1);
byteshift += curcodesize;
while(byteshift >= 8){
byte0 = byte1;
@@ -146,19 +154,54 @@ unsigned char *loadgif(FILE *infile, int *bufwidth, int *bufheight){
}
if(code == clearcode){
- printf("clearcode\n");
+clear:
+ printf("%i. clear\n", count);
curcodesize = initcodesize + 1;
- newcode = endcode + 1;
+ newcode = endcode; /* endcode is also used as a sentinel */
+ for(a = 0; a < clearcode; a++){
+ length[a] = 0;
+ prefix[a] = 0;
+
+ suffix[a*3] = palette[a*3];
+ suffix[a*3+1] = palette[a*3+1];
+ suffix[a*3+2] = palette[a*3+2];
+ }
+
}else if(code == endcode){
- printf("endcode with %i bytes left\n", bytesleft);
- break;
+ printf("%i. endcode\n", count);
+ return buf;
}else{
+ assert(newcode < MAX_CODES);
+ printf("newcode: %x\n", newcode);
+ if(code <= newcode){
+ printf("%i. dict\n", count);
+ prefix[newcode+1] = i;
+ length[newcode+1] = length[code] + 1;
+ for(a = prefix[code]; a < prefix[code] + length[code]; a++){
+ buf[i*3] = buf[a*3];
+ buf[i*3+1] = buf[a*3+1];
+ buf[i*3+2] = buf[a*3+2];
+ i++;
+ }
+ buf[i*3] = suffix[code*3];
+ buf[i*3+1] = suffix[code*3+1];
+ buf[i*3+2] = suffix[code*3+1];
+ i++;
+
+ suffix[newcode*3 + 3] = suffix[newcode*3] = buf[prefix[newcode+1] * 3];
+ suffix[newcode*3 + 4] = suffix[newcode*3 + 1] = buf[prefix[newcode+1] * 3 + 1];
+ suffix[newcode*3 + 5] = suffix[newcode*3 + 2] = buf[prefix[newcode+1] * 3 + 2];
+ printf("codes[%x] = {%x,%x,%x}\n", newcode, prefix[newcode], length[newcode], suffix[newcode]);
+ }else{
+ printf("code > newcode (%x > %x)\n", code, newcode);
+ return buf;
+ //exit(1);
+ }
+
newcode++;
- }
-
- /* process code */
- if(newcode == 1 << curcodesize){
- curcodesize++;
+ if(newcode == 1 << curcodesize){
+ curcodesize++;
+ }
}
}
}
diff --git a/src/main.c b/src/main.c
index 51dea22..8a6abf3 100644
--- a/src/main.c
+++ b/src/main.c
@@ -27,8 +27,8 @@ static int popcount(unsigned long mask){
#else
int y;
- y = (mask >> 1) &033333333333;
- y = mask - y - ((y >>1) & 033333333333);
+ y = (mask >> 1) & 033333333333;
+ y = mask - y - ((y >> 1) & 033333333333);
return (((y + (y >> 3)) & 030707070707) % 077);
#endif
}
@@ -193,6 +193,7 @@ void run(struct imagenode *image){
XNextEvent(display, &event);
switch(event.type){
case MapNotify:
+ printf("map\n");
break;
case ConfigureNotify:
if(width != event.xconfigure.width || height != event.xconfigure.height){
@@ -202,9 +203,11 @@ void run(struct imagenode *image){
width = event.xconfigure.width;
height = event.xconfigure.height;
}
+ printf("%i, %i\n", width, height);
break;
case Expose:
redraw = 1;
+ printf("expose\n");
break;
case KeyPress:
switch(XLookupKeysym(&event.xkey, 0)){