U8 a,r,g,b;
} COL;
-int png_read_chunk(char (*head)[4], int*destlen, U8**destdata, FILE*fi)
+static int png_read_chunk(char (*head)[4], int*destlen, U8**destdata, FILE*fi)
{
unsigned int len;
unsigned char blen[4];
return 1;
}
-unsigned int png_get_dword(FILE*fi)
+static unsigned int png_get_dword(FILE*fi)
{
unsigned int a;
unsigned char b[4];
int mode;
};
-int png_read_header(FILE*fi, struct png_header*header)
+static int png_read_header(FILE*fi, struct png_header*header)
{
char id[4];
int len;
typedef unsigned char byte;
#define ABS(a) ((a)>0?(a):(-(a)))
-byte inline PaethPredictor (byte a,byte b,byte c)
+static inline byte PaethPredictor (byte a,byte b,byte c)
{
// a = left, b = above, c = upper left
int p = a + b - c; // initial estimate
else return c;
}
-void applyfilter1(int mode, U8*src, U8*old, U8*dest, int width)
+static void applyfilter1(int mode, U8*src, U8*old, U8*dest, int width)
{
int x;
unsigned char last=0;
}
-void applyfilter2(int mode, U8*src, U8*old, U8*dest, int width)
+static void applyfilter2(int mode, U8*src, U8*old, U8*dest, int width)
{
int x;
unsigned char lasta=0;
/* also performs 24 bit conversion! */
-void applyfilter3(int mode, U8*src, U8*old, U8*dest, int width)
+static void applyfilter3(int mode, U8*src, U8*old, U8*dest, int width)
{
int x;
unsigned char lastr=0;
}
}
-void inline applyfilter4(int mode, U8*src, U8*old, U8*dest, int width)
+static void inline applyfilter4(int mode, U8*src, U8*old, U8*dest, int width)
{
int x;
unsigned char lastr=0;
} else {
old = &data2[(y-1)*header.width*4];
}
- if(header.mode == 6)
+ if(header.mode == 6) {
applyfilter4(mode, src, old, dest, header.width);
- else // header.mode = 2
+ } else { // header.mode = 2
applyfilter3(mode, src, old, dest, header.width);
+ /* replace alpha color */
+ if(hasalphacolor) {
+ int x;
+ for(x=0;x<header.width;x++) {
+ if(dest[x*4+1] == alphacolor[0] &&
+ dest[x*4+2] == alphacolor[1] &&
+ dest[x*4+3] == alphacolor[2]) {
+ *(U32*)&dest[x*4] = 0;
+ }
+ }
+ }
+ }
}
free(imagedata);
} else if(header.mode == 0 || header.mode == 3) {