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