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#include "image_etc.h"
#include "image.h"
#include "rg_etc1.h"
#include "print_string.h"
#include "os/copymem.h"
static void _decompress_etc(Image *p_img) {
ERR_FAIL_COND(p_img->get_format()!=Image::FORMAT_ETC);
int imgw = p_img->get_width();
int imgh = p_img->get_height();
DVector<uint8_t> src=p_img->get_data();
DVector<uint8_t> dst;
DVector<uint8_t>::Read r = src.read();
int mmc=p_img->get_mipmaps();
for(int i=0;i<=mmc;i++) {
dst.resize(dst.size()+imgw*imgh*3);
const uint8_t *srcbr=&r[p_img->get_mipmap_offset(i)];
DVector<uint8_t>::Write w = dst.write();
uint8_t *wptr = &w[dst.size()-imgw*imgh*3];
int bw=MAX(imgw/4,1);
int bh=MAX(imgh/4,1);
for(int y=0;y<bh;y++) {
for(int x=0;x<bw;x++) {
uint8_t block[4*4*4];
rg_etc1::unpack_etc1_block(srcbr,(unsigned int*)block);
srcbr+=8;
int maxx=MIN(imgw,4);
int maxy=MIN(imgh,4);
for(int yy=0;yy<maxy;yy++) {
for(int xx=0;xx<maxx;xx++) {
uint32_t src_ofs = (yy*4+xx)*4;
uint32_t dst_ofs = ((y*4+yy)*imgw+x*4+xx)*3;
wptr[dst_ofs+0]=block[src_ofs+0];
wptr[dst_ofs+1]=block[src_ofs+1];
wptr[dst_ofs+2]=block[src_ofs+2];
}
}
}
}
imgw=MAX(1,imgw/2);
imgh=MAX(1,imgh/2);
}
r=DVector<uint8_t>::Read();
//print_line("Re Creating ETC into regular image: w "+itos(p_img->get_width())+" h "+itos(p_img->get_height())+" mm "+itos(p_img->get_mipmaps()));
*p_img=Image(p_img->get_width(),p_img->get_height(),p_img->get_mipmaps(),Image::FORMAT_RGB,dst);
if (p_img->get_mipmaps())
p_img->generate_mipmaps(-1,true);
}
static void _compress_etc(Image *p_img) {
Image img = *p_img;
int imgw=img.get_width(),imgh=img.get_height();
ERR_FAIL_COND( nearest_power_of_2(imgw)!=imgw || nearest_power_of_2(imgh)!=imgh );
if (img.get_format()!=Image::FORMAT_RGB)
img.convert(Image::FORMAT_RGB);
int mmc=img.get_mipmaps();
if (mmc==0)
img.generate_mipmaps(); // force mipmaps, so it works on most hardware
DVector<uint8_t> res_data;
DVector<uint8_t> dst_data;
DVector<uint8_t>::Read r = img.get_data().read();
int mc=0;
rg_etc1::etc1_pack_params pp;
pp.m_quality=rg_etc1::cLowQuality;
for(int i=0;i<=mmc;i++) {
int bw=MAX(imgw/4,1);
int bh=MAX(imgh/4,1);
const uint8_t *src = &r[img.get_mipmap_offset(i)];
int mmsize = MAX(bw,1)*MAX(bh,1)*8;
dst_data.resize(dst_data.size()+mmsize);
DVector<uint8_t>::Write w=dst_data.write();
uint8_t *dst = &w[dst_data.size()-mmsize];
// print_line("bh: "+itos(bh)+" bw: "+itos(bw));
for(int y=0;y<bh;y++) {
for(int x=0;x<bw;x++) {
// print_line("x: "+itos(x)+" y: "+itos(y));
uint8_t block[4*4*4];
zeromem(block,4*4*4);
uint8_t cblock[8];
int maxy = MIN(imgh,4);
int maxx = MIN(imgw,4);
for(int yy=0;yy<maxy;yy++) {
for(int xx=0;xx<maxx;xx++) {
uint32_t dst_ofs = (yy*4+xx)*4;
uint32_t src_ofs = ((y*4+yy)*imgw+x*4+xx)*3;
block[dst_ofs+0]=src[src_ofs+0];
block[dst_ofs+1]=src[src_ofs+1];
block[dst_ofs+2]=src[src_ofs+2];
block[dst_ofs+3]=255;
}
}
rg_etc1::pack_etc1_block(cblock, (const unsigned int*)block, pp);
for(int j=0;j<8;j++) {
dst[j]=cblock[j];
}
dst+=8;
}
}
imgw=MAX(1,imgw/2);
imgh=MAX(1,imgh/2);
mc++;
}
*p_img=Image(p_img->get_width(),p_img->get_height(),mc-1,Image::FORMAT_ETC,dst_data);
}
void _register_etc1_compress_func() {
rg_etc1::pack_etc1_block_init();
Image::_image_compress_etc_func=_compress_etc;
Image::_image_decompress_etc=_decompress_etc;
}
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