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ability to shrink all images x2 on load

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this is for extreme cases when running on devices with very low video
memory, so you can still retain compatibility.
This commit is contained in:
Juan Linietsky 2016-05-04 12:36:51 -03:00
parent 0fa5154c0a
commit 89d87294db
11 changed files with 103 additions and 2 deletions
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60
core/image.cpp
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@ -901,6 +901,66 @@ static void _generate_po2_mipmap(const uint8_t* p_src, uint8_t* p_dst, uint32_t
}
void Image::shrink_x2() {
ERR_FAIL_COND(format==FORMAT_INDEXED || format==FORMAT_INDEXED_ALPHA);
ERR_FAIL_COND( data.size()==0 );
if (mipmaps) {
//just use the lower mipmap as base and copy all
DVector<uint8_t> new_img;
int ofs = get_mipmap_offset(1);
int new_size = data.size()-ofs;
new_img.resize(new_size);
{
DVector<uint8_t>::Write w=new_img.write();
DVector<uint8_t>::Read r=data.read();
copymem(w.ptr(),&r[ofs],new_size);
}
mipmaps--;
width/=2;
height/=2;
data=new_img;
} else {
DVector<uint8_t> new_img;
ERR_FAIL_COND( format>=FORMAT_INDEXED );
int ps = get_format_pixel_size(format);
new_img.resize((width/2)*(height/2)*ps);
{
DVector<uint8_t>::Write w=new_img.write();
DVector<uint8_t>::Read r=data.read();
switch(format) {
case FORMAT_GRAYSCALE:
case FORMAT_INTENSITY: _generate_po2_mipmap<1>(r.ptr(), w.ptr(), width,height); break;
case FORMAT_GRAYSCALE_ALPHA: _generate_po2_mipmap<2>(r.ptr(), w.ptr(), width,height); break;
case FORMAT_RGB: _generate_po2_mipmap<3>(r.ptr(), w.ptr(), width,height); break;
case FORMAT_RGBA: _generate_po2_mipmap<4>(r.ptr(), w.ptr(), width,height); break;
default: {}
}
}
width/=2;
height/=2;
data=new_img;
}
}
Error Image::generate_mipmaps(int p_mipmaps,bool p_keep_existing) {
if (!_can_modify(format)) {