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#include "image_compress_squish.h"
#include "squish/squish.h"
#include "print_string.h"
void image_compress_squish(Image *p_image) {
int w=p_image->get_width();
int h=p_image->get_height();
if (p_image->get_mipmaps() == 0) {
ERR_FAIL_COND( !w || w % 4 != 0);
ERR_FAIL_COND( !h || h % 4 != 0);
} else {
ERR_FAIL_COND( !w || w !=nearest_power_of_2(w) );
ERR_FAIL_COND( !h || h !=nearest_power_of_2(h) );
};
if (p_image->get_format()>=Image::FORMAT_BC1)
return; //do not compress, already compressed
Image::AlphaMode alpha = p_image->detect_alpha();
Image::Format target_format;
int shift=0;
int squish_comp=squish::kColourRangeFit;
switch(alpha) {
case Image::ALPHA_NONE: target_format = Image::FORMAT_BC1; shift=1; squish_comp|=squish::kDxt1; break;
case Image::ALPHA_BIT: target_format = Image::FORMAT_BC2; squish_comp|=squish::kDxt3; break;
case Image::ALPHA_BLEND: target_format = Image::FORMAT_BC3; squish_comp|=squish::kDxt5; break;
}
p_image->convert(Image::FORMAT_RGBA); //always expects rgba
int mm_count = p_image->get_mipmaps();
DVector<uint8_t> data;
int target_size = Image::get_image_data_size(w,h,target_format,mm_count);
data.resize(target_size);
DVector<uint8_t>::Read rb = p_image->get_data().read();
DVector<uint8_t>::Write wb = data.write();
int dst_ofs=0;
for(int i=0;i<=mm_count;i++) {
int src_ofs = p_image->get_mipmap_offset(i);
squish::CompressImage( &rb[src_ofs],w,h,&wb[dst_ofs],squish_comp);
dst_ofs+=(MAX(4,w)*MAX(4,h))>>shift;
w>>=1;
h>>=1;
}
rb = DVector<uint8_t>::Read();
wb = DVector<uint8_t>::Write();
p_image->create(p_image->get_width(),p_image->get_height(),p_image->get_mipmaps(),target_format,data);
}
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