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/*
* The Python Imaging Library
* $Id$
*
* imaging access objects
*
* Copyright (c) Fredrik Lundh 2009.
*
* See the README file for information on usage and redistribution.
*/
#include "Imaging.h"
/* use make_hash.py from the pillow-scripts repository to calculate these values */
#define ACCESS_TABLE_SIZE 35
#define ACCESS_TABLE_HASH 8940
static struct ImagingAccessInstance access_table[ACCESS_TABLE_SIZE];
static inline UINT32
hash(const char *mode) {
UINT32 i = ACCESS_TABLE_HASH;
while (*mode) {
i = ((i << 5) + i) ^ (UINT8)*mode++;
}
return i % ACCESS_TABLE_SIZE;
}
static ImagingAccess
add_item(const char *mode) {
UINT32 i = hash(mode);
/* printf("hash %s => %d\n", mode, i); */
if (access_table[i].mode && strcmp(access_table[i].mode, mode) != 0) {
fprintf(
stderr,
"AccessInit: hash collision: %d for both %s and %s\n",
i,
mode,
access_table[i].mode);
exit(1);
}
access_table[i].mode = mode;
return &access_table[i];
}
/* fetch individual pixel */
static void
get_pixel_32_2bands(Imaging im, int x, int y, void *color) {
char *out = color;
UINT8 *p = (UINT8 *)&im->image32[y][x];
out[0] = p[0];
out[1] = p[3];
}
static void
get_pixel_8(Imaging im, int x, int y, void *color) {
char *out = color;
out[0] = im->image8[y][x];
}
static void
get_pixel_16L(Imaging im, int x, int y, void *color) {
UINT8 *in = (UINT8 *)&im->image[y][x + x];
#ifdef WORDS_BIGENDIAN
UINT16 out = in[0] + (in[1] << 8);
memcpy(color, &out, sizeof(out));
#else
memcpy(color, in, sizeof(UINT16));
#endif
}
static void
get_pixel_16B(Imaging im, int x, int y, void *color) {
UINT8 *in = (UINT8 *)&im->image[y][x + x];
#ifdef WORDS_BIGENDIAN
memcpy(color, in, sizeof(UINT16));
#else
UINT16 out = in[1] + (in[0] << 8);
memcpy(color, &out, sizeof(out));
#endif
}
static void
get_pixel_16(Imaging im, int x, int y, void *color) {
UINT8 *in = (UINT8 *)&im->image[y][x + x];
memcpy(color, in, sizeof(UINT16));
}
static void
get_pixel_BGR15(Imaging im, int x, int y, void *color) {
UINT8 *in = (UINT8 *)&im->image8[y][x * 2];
UINT16 pixel = in[0] + (in[1] << 8);
char *out = color;
out[0] = (pixel & 31) * 255 / 31;
out[1] = ((pixel >> 5) & 31) * 255 / 31;
out[2] = ((pixel >> 10) & 31) * 255 / 31;
}
static void
get_pixel_BGR16(Imaging im, int x, int y, void *color) {
UINT8 *in = (UINT8 *)&im->image8[y][x * 2];
UINT16 pixel = in[0] + (in[1] << 8);
char *out = color;
out[0] = (pixel & 31) * 255 / 31;
out[1] = ((pixel >> 5) & 63) * 255 / 63;
out[2] = ((pixel >> 11) & 31) * 255 / 31;
}
static void
get_pixel_BGR24(Imaging im, int x, int y, void *color) {
memcpy(color, &im->image8[y][x * 3], sizeof(UINT8) * 3);
}
static void
get_pixel_32(Imaging im, int x, int y, void *color) {
memcpy(color, &im->image32[y][x], sizeof(INT32));
}
static void
get_pixel_32L(Imaging im, int x, int y, void *color) {
UINT8 *in = (UINT8 *)&im->image[y][x * 4];
#ifdef WORDS_BIGENDIAN
INT32 out = in[0] + (in[1] << 8) + (in[2] << 16) + (in[3] << 24);
memcpy(color, &out, sizeof(out));
#else
memcpy(color, in, sizeof(INT32));
#endif
}
static void
get_pixel_32B(Imaging im, int x, int y, void *color) {
UINT8 *in = (UINT8 *)&im->image[y][x * 4];
#ifdef WORDS_BIGENDIAN
memcpy(color, in, sizeof(INT32));
#else
INT32 out = in[3] + (in[2] << 8) + (in[1] << 16) + (in[0] << 24);
memcpy(color, &out, sizeof(out));
#endif
}
/* store individual pixel */
static void
put_pixel_8(Imaging im, int x, int y, const void *color) {
im->image8[y][x] = *((UINT8 *)color);
}
static void
put_pixel_16L(Imaging im, int x, int y, const void *color) {
memcpy(&im->image8[y][x + x], color, 2);
}
static void
put_pixel_16B(Imaging im, int x, int y, const void *color) {
const char *in = color;
UINT8 *out = (UINT8 *)&im->image8[y][x + x];
out[0] = in[1];
out[1] = in[0];
}
static void
put_pixel_BGR1516(Imaging im, int x, int y, const void *color) {
memcpy(&im->image8[y][x * 2], color, 2);
}
static void
put_pixel_BGR24(Imaging im, int x, int y, const void *color) {
memcpy(&im->image8[y][x * 3], color, 3);
}
static void
put_pixel_32L(Imaging im, int x, int y, const void *color) {
memcpy(&im->image8[y][x * 4], color, 4);
}
static void
put_pixel_32B(Imaging im, int x, int y, const void *color) {
const char *in = color;
UINT8 *out = (UINT8 *)&im->image8[y][x * 4];
out[0] = in[3];
out[1] = in[2];
out[2] = in[1];
out[3] = in[0];
}
static void
put_pixel_32(Imaging im, int x, int y, const void *color) {
memcpy(&im->image32[y][x], color, sizeof(INT32));
}
void
ImagingAccessInit() {
#define ADD(mode_, get_pixel_, put_pixel_) \
{ \
ImagingAccess access = add_item(mode_); \
access->get_pixel = get_pixel_; \
access->put_pixel = put_pixel_; \
}
/* populate access table */
ADD("1", get_pixel_8, put_pixel_8);
ADD("L", get_pixel_8, put_pixel_8);
ADD("LA", get_pixel_32_2bands, put_pixel_32);
ADD("La", get_pixel_32_2bands, put_pixel_32);
ADD("I", get_pixel_32, put_pixel_32);
ADD("I;16", get_pixel_16L, put_pixel_16L);
ADD("I;16L", get_pixel_16L, put_pixel_16L);
ADD("I;16B", get_pixel_16B, put_pixel_16B);
ADD("I;16N", get_pixel_16, put_pixel_16L);
ADD("I;32L", get_pixel_32L, put_pixel_32L);
ADD("I;32B", get_pixel_32B, put_pixel_32B);
ADD("F", get_pixel_32, put_pixel_32);
ADD("P", get_pixel_8, put_pixel_8);
ADD("PA", get_pixel_32_2bands, put_pixel_32);
ADD("BGR;15", get_pixel_BGR15, put_pixel_BGR1516);
ADD("BGR;16", get_pixel_BGR16, put_pixel_BGR1516);
ADD("BGR;24", get_pixel_BGR24, put_pixel_BGR24);
ADD("RGB", get_pixel_32, put_pixel_32);
ADD("RGBA", get_pixel_32, put_pixel_32);
ADD("RGBa", get_pixel_32, put_pixel_32);
ADD("RGBX", get_pixel_32, put_pixel_32);
ADD("CMYK", get_pixel_32, put_pixel_32);
ADD("YCbCr", get_pixel_32, put_pixel_32);
ADD("LAB", get_pixel_32, put_pixel_32);
ADD("HSV", get_pixel_32, put_pixel_32);
}
ImagingAccess
ImagingAccessNew(Imaging im) {
ImagingAccess access = &access_table[hash(im->mode)];
if (im->mode[0] != access->mode[0] || strcmp(im->mode, access->mode) != 0) {
return NULL;
}
return access;
}
void
_ImagingAccessDelete(Imaging im, ImagingAccess access) {}
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