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aaresize.c
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/
aaresize.c
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/*-----------------------------------------------------------------------
This file is part of aaphoto.
aaphoto is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
aaphoto is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
------------------------------------------------------------------------*/
int RESIZE(
unsigned char **image_buffer,
unsigned long *image_width,
unsigned long *image_height,
unsigned long new_width,
unsigned long new_height,
int alpha_flag)
{
unsigned int startx, endx;
unsigned int starty, endy;
unsigned int i, j, x, y;
unsigned char *bitmap_buffer2;
/* if there is an Alpha channel beside the RGB too */
/* then i need to allocate more memory for Alpha channel */
/* not 3x but 5x more than the number of pixels in image */
if (alpha_flag) { alpha_flag = 2; }
/*allocate memory */
/* print info */ STRING_PRINTV("allocating memory for uncompressed bitmap image\n");
bitmap_buffer2 = malloc(new_width * new_height * (3 + alpha_flag) * sizeof (*bitmap_buffer2));
if (bitmap_buffer2 == 0) return 1;
/* print info */ STRING_PRINTV("resizing image\n");
#ifdef __OPENMP__
#pragma omp parallel for private(i, j, x, y, startx, starty, endx, endy) num_threads(max_threads)
#endif
for (j=0; j<new_height; j++){
for (i=0; i<new_width; i++){
long addr = 0;
long rgb_avg_r = 0;
long rgb_avg_g = 0;
long rgb_avg_b = 0;
long rgb_avg_a = 0;
long rgb_counter = 0;
startx = *image_width * i / new_width;
endx = *image_width * (i+1) / new_width;
starty = *image_height * j / new_height;
endy = *image_height * (j+1) / new_height;
for (y=starty; y<endy; y++){
for (x=startx; x<endx; x++){
addr = (x + y * *image_width);
rgb_avg_r += (*image_buffer)[3 * addr + 0];
rgb_avg_g += (*image_buffer)[3 * addr + 1];
rgb_avg_b += (*image_buffer)[3 * addr + 2];
if (alpha_flag) {
rgb_avg_a += (*image_buffer)[(*image_width) * (*image_height) * 3 + addr + 0];
}
rgb_counter++;
}
}
if (rgb_counter > 0){
rgb_avg_r = rgb_avg_r / rgb_counter;
rgb_avg_g = rgb_avg_g / rgb_counter;
rgb_avg_b = rgb_avg_b / rgb_counter;
if (alpha_flag) { rgb_avg_a = rgb_avg_a / rgb_counter; }
}
addr = (i + j * new_width);
bitmap_buffer2[3 * addr + 0] = rgb_avg_r;
bitmap_buffer2[3 * addr + 1] = rgb_avg_g;
bitmap_buffer2[3 * addr + 2] = rgb_avg_b;
if (alpha_flag) {
bitmap_buffer2[new_width * new_height * 3 + addr + 0] = rgb_avg_a;
}
}
}
/* print info */ STRING_PRINTV("freeing uncompressed bitmap buffer\n");
free(*image_buffer);
*image_buffer = bitmap_buffer2;
*image_width = new_width;
*image_height = new_height;
return 0;
}
int ROTATE90(
unsigned char **image_buffer,
unsigned long *image_width,
unsigned long *image_height,
int alpha_flag)
{
unsigned char *bitmap_buffer2;
unsigned int x, y;
unsigned long new_width;
unsigned long new_height;
new_width = *image_width;
new_height = *image_height;
/*allocate memory */
if (alpha_flag) { alpha_flag = 2; }
/* print info */ STRING_PRINTV("allocating memory for uncompressed bitmap image\n");
bitmap_buffer2 = malloc(new_width * new_height * (3 + alpha_flag) * sizeof (*bitmap_buffer2));
if (bitmap_buffer2 == 0) return 1;
/* print info */ STRING_PRINTV("rotating image with 90\n");
#ifdef __OPENMP__
#pragma omp parallel for private(x, y) num_threads(max_threads)
#endif
for (y=0; y<new_height; y++){
for (x=0; x<new_width; x++){
long addr = 0;
long rgb_avg_r = 0;
long rgb_avg_g = 0;
long rgb_avg_b = 0;
long rgb_avg_a = 0;
addr = (x + y * new_width);
rgb_avg_r += (*image_buffer)[3 * addr + 0];
rgb_avg_g += (*image_buffer)[3 * addr + 1];
rgb_avg_b += (*image_buffer)[3 * addr + 2];
if (alpha_flag){ rgb_avg_a += (*image_buffer)[(*image_width) * (*image_height) * 3 + addr + 0]; }
addr = ((new_height - 1 - y) + x * new_height);
bitmap_buffer2[3 * addr + 0] = rgb_avg_r;
bitmap_buffer2[3 * addr + 1] = rgb_avg_g;
bitmap_buffer2[3 * addr + 2] = rgb_avg_b;
if (alpha_flag){ bitmap_buffer2[new_width * new_height * 3 + addr + 2] = rgb_avg_a; }
}
}
/* print info */ STRING_PRINTV("freeing uncompressed bitmap buffer\n");
free(*image_buffer);
*image_buffer = bitmap_buffer2;
*image_width = new_height;
*image_height = new_width;
return 0;
}
int ROTATE180(
unsigned char **image_buffer,
unsigned long *image_width,
unsigned long *image_height,
int alpha_flag)
{
int x, y, x_max, y_max, y_odd;
unsigned long new_width;
unsigned long new_height;
new_width = *image_width;
new_height = *image_height;
/* print info */ STRING_PRINTV("rotating image with 180\n");
/* is the number of lines an odd number? */
y_odd = new_height & 1;
y_max = new_height/2 + y_odd;
#ifdef __OPENMP__
#pragma omp parallel for private(x, y, x_max) num_threads(max_threads)
#endif
for (y=0; y<y_max; y++){
x_max = new_width;
/* if the height is an odd number, then the flipping should go only to the middle of the width */
/* in the middle line */
if ((y_odd) && (y == y_max-1)){ x_max = new_width/2; }
for (x=0; x<x_max; x++){
long addr1 = 0;
long addr2 = 0;
long rgb_avg_r1 = 0;
long rgb_avg_g1 = 0;
long rgb_avg_b1 = 0;
long rgb_avg_a1 = 0;
long rgb_avg_r2 = 0;
long rgb_avg_g2 = 0;
long rgb_avg_b2 = 0;
long rgb_avg_a2 = 0;
addr1 = (x + y * new_width);
addr2 = ((new_width - 1 - x) + (new_height - 1 - y) * new_width);
rgb_avg_r1 += (*image_buffer)[3 * addr1 + 0];
rgb_avg_g1 += (*image_buffer)[3 * addr1 + 1];
rgb_avg_b1 += (*image_buffer)[3 * addr1 + 2];
if (alpha_flag){ rgb_avg_a1 += (*image_buffer)[(*image_width) * (*image_height) * 3 + addr1 + 0]; }
rgb_avg_r2 += (*image_buffer)[3 * addr2 + 0];
rgb_avg_g2 += (*image_buffer)[3 * addr2 + 1];
rgb_avg_b2 += (*image_buffer)[3 * addr2 + 2];
if (alpha_flag){ rgb_avg_a2 += (*image_buffer)[(*image_width) * (*image_height) * 3 + addr2 + 0]; }
(*image_buffer)[3 * addr1 + 0] = rgb_avg_r2;
(*image_buffer)[3 * addr1 + 1] = rgb_avg_g2;
(*image_buffer)[3 * addr1 + 2] = rgb_avg_b2;
if (alpha_flag){ (*image_buffer)[(*image_width) * (*image_height) * 3 + addr1 + 0] = rgb_avg_a2; }
(*image_buffer)[3 * addr2 + 0] = rgb_avg_r1;
(*image_buffer)[3 * addr2 + 1] = rgb_avg_g1;
(*image_buffer)[3 * addr2 + 2] = rgb_avg_b1;
if (alpha_flag){ (*image_buffer)[(*image_width) * (*image_height) * 3 + addr2 + 0] = rgb_avg_a1; }
}
}
return 0;
}
int ROTATE270(
unsigned char **image_buffer,
unsigned long *image_width,
unsigned long *image_height,
int alpha_flag)
{
unsigned char *bitmap_buffer2;
unsigned int x, y;
unsigned long new_width;
unsigned long new_height;
new_width = *image_width;
new_height = *image_height;
/*allocate memory */
if (alpha_flag) { alpha_flag = 2; }
/* print info */ STRING_PRINTV("allocating memory for uncompressed bitmap image\n");
bitmap_buffer2 = malloc(new_width * new_height * (3 + alpha_flag) * sizeof (*bitmap_buffer2));
if (bitmap_buffer2 == 0) return 1;
/* print info */ STRING_PRINTV("rotating image with 270\n");
#ifdef __OPENMP__
#pragma omp parallel for private(x, y) num_threads(max_threads)
#endif
for (y=0; y<new_height; y++){
for (x=0; x<new_width; x++){
long addr = 0;
long rgb_avg_r = 0;
long rgb_avg_g = 0;
long rgb_avg_b = 0;
long rgb_avg_a = 0;
addr = (x + y * new_width);
rgb_avg_r += (*image_buffer)[3 * addr + 0];
rgb_avg_g += (*image_buffer)[3 * addr + 1];
rgb_avg_b += (*image_buffer)[3 * addr + 2];
if (alpha_flag){ rgb_avg_a += (*image_buffer)[(*image_width) * (*image_height) * 3 + addr + 0]; }
addr = (y + (new_width - 1 - x) * new_height);
bitmap_buffer2[3 * addr + 0] = rgb_avg_r;
bitmap_buffer2[3 * addr + 1] = rgb_avg_g;
bitmap_buffer2[3 * addr + 2] = rgb_avg_b;
if (alpha_flag){ bitmap_buffer2[(*image_width) * (*image_height) * 3 + addr + 0] = rgb_avg_a; }
}
}
/* print info */ STRING_PRINTV("freeing uncompressed bitmap buffer\n");
free(*image_buffer);
*image_buffer = bitmap_buffer2;
*image_width = new_height;
*image_height = new_width;
return 0;
}
int FLIPX(
unsigned char **image_buffer,
unsigned long *image_width,
unsigned long *image_height,
int alpha_flag)
{
unsigned int x, y;
unsigned long new_width;
unsigned long new_height;
new_width = *image_width;
new_height = *image_height;
/* print info */ STRING_PRINTV("flipping image horizontally\n");
#ifdef __OPENMP__
#pragma omp parallel for private(x, y) num_threads(max_threads)
#endif
for (y=0; y<new_height; y++){
for (x=0; x<(new_width/2); x++){
long addr1 = 0;
long addr2 = 0;
long rgb_avg_r1 = 0;
long rgb_avg_g1 = 0;
long rgb_avg_b1 = 0;
long rgb_avg_a1 = 0;
long rgb_avg_r2 = 0;
long rgb_avg_g2 = 0;
long rgb_avg_b2 = 0;
long rgb_avg_a2 = 0;
addr1 = (x + y * new_width);
addr2 = ((new_width - 1 - x) + y * new_width);
rgb_avg_r1 += (*image_buffer)[3 * addr1 + 0];
rgb_avg_g1 += (*image_buffer)[3 * addr1 + 1];
rgb_avg_b1 += (*image_buffer)[3 * addr1 + 2];
if (alpha_flag){ rgb_avg_a1 += (*image_buffer)[(*image_width) * (*image_height) * 3 + addr1 + 0]; }
rgb_avg_r2 += (*image_buffer)[3 * addr2 + 0];
rgb_avg_g2 += (*image_buffer)[3 * addr2 + 1];
rgb_avg_b2 += (*image_buffer)[3 * addr2 + 2];
if (alpha_flag){ rgb_avg_a2 += (*image_buffer)[(*image_width) * (*image_height) * 3 + addr2 + 0]; }
(*image_buffer)[3 * addr1 + 0] = rgb_avg_r2;
(*image_buffer)[3 * addr1 + 1] = rgb_avg_g2;
(*image_buffer)[3 * addr1 + 2] = rgb_avg_b2;
if (alpha_flag){ (*image_buffer)[(*image_width) * (*image_height) * 3 + addr1 + 0] = rgb_avg_a2; }
(*image_buffer)[3 * addr2 + 0] = rgb_avg_r1;
(*image_buffer)[3 * addr2 + 1] = rgb_avg_g1;
(*image_buffer)[3 * addr2 + 2] = rgb_avg_b1;
if (alpha_flag){ (*image_buffer)[(*image_width) * (*image_height) * 3 + addr2 + 0] = rgb_avg_a1; }
}
}
return 0;
}
int FLIPY(
unsigned char **image_buffer,
unsigned long *image_width,
unsigned long *image_height,
int alpha_flag)
{
unsigned int x, y;
unsigned long new_width;
unsigned long new_height;
new_width = *image_width;
new_height = *image_height;
/* print info */ STRING_PRINTV("flipping image vertically\n");
#ifdef __OPENMP__
#pragma omp parallel for private(x, y) num_threads(max_threads)
#endif
for (y=0; y<(new_height/2); y++){
for (x=0; x<new_width; x++){
long addr1 = 0;
long addr2 = 0;
long rgb_avg_r1 = 0;
long rgb_avg_g1 = 0;
long rgb_avg_b1 = 0;
long rgb_avg_a1 = 0;
long rgb_avg_r2 = 0;
long rgb_avg_g2 = 0;
long rgb_avg_b2 = 0;
long rgb_avg_a2 = 0;
addr1 = (x + y * new_width);
addr2 = (x + (new_height - 1 - y) * new_width);
rgb_avg_r1 += (*image_buffer)[3 * addr1 + 0];
rgb_avg_g1 += (*image_buffer)[3 * addr1 + 1];
rgb_avg_b1 += (*image_buffer)[3 * addr1 + 2];
if (alpha_flag){ rgb_avg_a1 += (*image_buffer)[(*image_width) * (*image_height) * 3 + addr1 + 0]; }
rgb_avg_r2 += (*image_buffer)[3 * addr2 + 0];
rgb_avg_g2 += (*image_buffer)[3 * addr2 + 1];
rgb_avg_b2 += (*image_buffer)[3 * addr2 + 2];
if (alpha_flag){ rgb_avg_a2 += (*image_buffer)[(*image_width) * (*image_height) * 3 + addr2 + 0]; }
(*image_buffer)[3 * addr1 + 0] = rgb_avg_r2;
(*image_buffer)[3 * addr1 + 1] = rgb_avg_g2;
(*image_buffer)[3 * addr1 + 2] = rgb_avg_b2;
if (alpha_flag){ (*image_buffer)[(*image_width) * (*image_height) * 3 + addr1 + 0] = rgb_avg_a2; }
(*image_buffer)[3 * addr2 + 0] = rgb_avg_r1;
(*image_buffer)[3 * addr2 + 1] = rgb_avg_g1;
(*image_buffer)[3 * addr2 + 2] = rgb_avg_b1;
if (alpha_flag){ (*image_buffer)[(*image_width) * (*image_height) * 3 + addr2 + 0] = rgb_avg_a1; }
}
}
return 0;
}