uint8_t pixdata[DCTSIZE2];
idct_choice(coeff, image->idct_data[image->qtable[cn]], pixdata);
- for (unsigned y = 0; y < DCTSIZE; ++y) {
- unsigned real_x = (mcu_x * image->hsample[cn] + local_xb) * DCTSIZE;
- unsigned real_y = (mcu_y * image->vsample[cn] + local_yb) * DCTSIZE + y;
-
- memcpy(image->pixel_data[cn] + real_y * stride + real_x,
- pixdata + y * DCTSIZE,
- DCTSIZE);
+ unsigned real_x = (mcu_x * image->hsample[cn] + local_xb) * DCTSIZE;
+ unsigned real_y = (mcu_y * image->vsample[cn] + local_yb) * DCTSIZE;
+ uint8_t* dest_pixdata = image->pixel_data[cn] + real_y * stride + real_x;
+ for (unsigned y = 0; y < DCTSIZE; ++y, dest_pixdata += stride) {
+ memcpy(dest_pixdata, pixdata + y * DCTSIZE, DCTSIZE);
}
}
}
const int c = 1;
if (mcu_y == image->num_blocks_vertical) {
unsigned stride = image->num_blocks_horizontal * image->hsample[c] * DCTSIZE;
- printf("P5\n%u %u\n255\n", stride, image->height);
- fwrite(image->pixel_data[c], stride * image->height, 1, stdout);
+ unsigned height = image->num_blocks_vertical * image->vsample[c] * DCTSIZE;
+ printf("P5\n%u %u\n255\n", stride, height);
+ fwrite(image->pixel_data[c], stride * height, 1, stdout);
}
}
}