| 90 |
|
} BMPWriter; |
| 91 |
|
|
| 92 |
|
/* open BMP stream for reading */ |
| 93 |
< |
BMPReader *BMPopenReader(int (*cget)(void *), |
| 93 |
> |
extern BMPReader *BMPopenReader(int (*cget)(void *), |
| 94 |
|
int (*seek)(uint32, void *), void *c_data); |
| 95 |
|
|
| 96 |
|
/* determine if image is grayscale */ |
| 97 |
< |
int BMPisGrayscale(const BMPHeader *hdr); |
| 97 |
> |
extern int BMPisGrayscale(const BMPHeader *hdr); |
| 98 |
|
|
| 99 |
|
/* read next BMP scanline */ |
| 100 |
< |
int BMPreadScanline(BMPReader *br); |
| 100 |
> |
extern int BMPreadScanline(BMPReader *br); |
| 101 |
|
|
| 102 |
|
/* read a specific scanline */ |
| 103 |
< |
int BMPseekScanline(int y, BMPReader *br); |
| 103 |
> |
extern int BMPseekScanline(int y, BMPReader *br); |
| 104 |
|
|
| 105 |
|
/* get ith pixel from last scanline */ |
| 106 |
< |
RGBquad BMPdecodePixel(int i, const BMPReader *br); |
| 106 |
> |
extern RGBquad BMPdecodePixel(int i, const BMPReader *br); |
| 107 |
|
|
| 108 |
|
/* free BMP reader resources */ |
| 109 |
< |
void BMPfreeReader(BMPReader *br); |
| 109 |
> |
extern void BMPfreeReader(BMPReader *br); |
| 110 |
|
|
| 111 |
|
/* allocate uncompressed RGB header */ |
| 112 |
< |
BMPHeader *BMPtruecolorHeader(int xr, int yr, int infolen); |
| 112 |
> |
extern BMPHeader *BMPtruecolorHeader(int xr, int yr, int infolen); |
| 113 |
|
|
| 114 |
|
/* allocate color-mapped header */ |
| 115 |
< |
BMPHeader *BMPmappedHeader(int xr, int yr, int infolen, int ncolors); |
| 115 |
> |
extern BMPHeader *BMPmappedHeader(int xr, int yr, int infolen, int ncolors); |
| 116 |
|
|
| 117 |
|
/* open BMP stream for writing */ |
| 118 |
< |
BMPWriter *BMPopenWriter(void (*cput)(int, void *), |
| 118 |
> |
extern BMPWriter *BMPopenWriter(void (*cput)(int, void *), |
| 119 |
|
int (*seek)(uint32, void *), void *c_data, |
| 120 |
|
BMPHeader *hdr); |
| 121 |
|
|
| 122 |
|
/* write the prepared scanline */ |
| 123 |
< |
int BMPwriteScanline(BMPWriter *bw); |
| 123 |
> |
extern int BMPwriteScanline(BMPWriter *bw); |
| 124 |
|
|
| 125 |
|
/* free BMP writer resources */ |
| 126 |
< |
void BMPfreeWriter(BMPWriter *bw); |
| 126 |
> |
extern void BMPfreeWriter(BMPWriter *bw); |
| 127 |
|
|
| 128 |
|
/* get corresponding error message */ |
| 129 |
< |
const char *BMPerrorMessage(int ec); |
| 129 |
> |
extern const char *BMPerrorMessage(int ec); |
| 130 |
|
|
| 131 |
|
/* stdio callback functions */ |
| 132 |
< |
int stdio_getc(void *p); |
| 133 |
< |
void stdio_putc(int c, void *p); |
| 134 |
< |
int stdio_fseek(uint32 pos, void *p); |
| 132 |
> |
extern int stdio_getc(void *p); |
| 133 |
> |
extern void stdio_putc(int c, void *p); |
| 134 |
> |
extern int stdio_fseek(uint32 pos, void *p); |
| 135 |
|
|
| 136 |
|
/* open stdio input stream */ |
| 137 |
|
#define BMPopenInputStream(fp) BMPopenReader(&stdio_getc, NULL, (void *)fp) |
