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image.cpp
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/*************************************************************************/
/* image.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2015 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "image.h"
#include "hash_map.h"
#include "core/io/image_loader.h"
#include "core/os/copymem.h"
#include "print_string.h"
#include <stdio.h>
SavePNGFunc Image::save_png_func = NULL;
void Image::_put_pixel(int p_x,int p_y, const BColor& p_color, unsigned char *p_data) {
_put_pixelw(p_x,p_y,width,p_color,p_data);
}
void Image::_put_pixelw(int p_x,int p_y, int p_width, const BColor& p_color, unsigned char *p_data) {
int ofs=p_y*p_width+p_x;
switch(format) {
case FORMAT_GRAYSCALE: {
p_data[ofs]=p_color.gray();
} break;
case FORMAT_INTENSITY: {
p_data[ofs]=p_color.a;
} break;
case FORMAT_GRAYSCALE_ALPHA: {
p_data[ofs*2]=p_color.gray();
p_data[ofs*2+1]=p_color.a;
} break;
case FORMAT_RGB: {
p_data[ofs*3+0]=p_color.r;
p_data[ofs*3+1]=p_color.g;
p_data[ofs*3+2]=p_color.b;
} break;
case FORMAT_RGBA: {
p_data[ofs*4+0]=p_color.r;
p_data[ofs*4+1]=p_color.g;
p_data[ofs*4+2]=p_color.b;
p_data[ofs*4+3]=p_color.a;
} break;
case FORMAT_INDEXED:
case FORMAT_INDEXED_ALPHA: {
ERR_FAIL();
} break;
default: {};
}
}
void Image::_get_mipmap_offset_and_size(int p_mipmap,int &r_offset, int &r_width,int &r_height) const {
int w=width;
int h=height;
int ofs=0;
int pixel_size = get_format_pixel_size(format);
int pixel_rshift = get_format_pixel_rshift(format);
int minw,minh;
_get_format_min_data_size(format,minw,minh);
for(int i=0;i<p_mipmap;i++) {
int s = w*h;
s*=pixel_size;
s>>=pixel_rshift;
ofs+=s;
w=MAX(minw,w>>1);
h=MAX(minh,h>>1);
}
r_offset=ofs;
r_width=w;
r_height=h;
}
int Image::get_mipmap_offset(int p_mipmap) const {
ERR_FAIL_INDEX_V(p_mipmap,(mipmaps+1),-1);
int ofs,w,h;
_get_mipmap_offset_and_size(p_mipmap,ofs,w,h);
return ofs;
}
void Image::get_mipmap_offset_and_size(int p_mipmap,int &r_ofs, int &r_size) const {
int ofs,w,h;
_get_mipmap_offset_and_size(p_mipmap,ofs,w,h);
int ofs2;
_get_mipmap_offset_and_size(p_mipmap+1,ofs2,w,h);
r_ofs=ofs;
r_size=ofs2-ofs;
}
void Image::get_mipmap_offset_size_and_dimensions(int p_mipmap,int &r_ofs, int &r_size,int &w, int& h) const {
int ofs;
_get_mipmap_offset_and_size(p_mipmap,ofs,w,h);
int ofs2,w2,h2;
_get_mipmap_offset_and_size(p_mipmap+1,ofs2,w2,h2);
r_ofs=ofs;
r_size=ofs2-ofs;
}
void Image::put_pixel(int p_x,int p_y, const Color& p_color,int p_mipmap){
ERR_FAIL_INDEX(p_mipmap,mipmaps+1);
int ofs,w,h;
_get_mipmap_offset_and_size(p_mipmap,ofs,w,h);
ERR_FAIL_INDEX(p_x,w);
ERR_FAIL_INDEX(p_y,h);
DVector<uint8_t>::Write wp = data.write();
unsigned char *data_ptr=wp.ptr();
_put_pixelw(p_x,p_y,w,BColor(p_color.r*255,p_color.g*255,p_color.b*255,p_color.a*255),&data_ptr[ofs]);
}
Image::BColor Image::_get_pixel(int p_x,int p_y,const unsigned char *p_data,int p_data_size) const{
return _get_pixelw(p_x,p_y,width,p_data,p_data_size);
}
Image::BColor Image::_get_pixelw(int p_x,int p_y,int p_width,const unsigned char *p_data,int p_data_size) const{
int ofs=p_y*p_width+p_x;
BColor result(0,0,0,0);
switch(format) {
case FORMAT_GRAYSCALE: {
result=BColor(p_data[ofs],p_data[ofs],p_data[ofs],255.0);
} break;
case FORMAT_INTENSITY: {
result=BColor(255,255,255,p_data[ofs]);
} break;
case FORMAT_GRAYSCALE_ALPHA: {
result=BColor(p_data[ofs*2],p_data[ofs*2],p_data[ofs*2],p_data[ofs*2+1]);
} break;
case FORMAT_RGB: {
result=BColor(p_data[ofs*3],p_data[ofs*3+1],p_data[ofs*3+2]);
} break;
case FORMAT_RGBA: {
result=BColor(p_data[ofs*4],p_data[ofs*4+1],p_data[ofs*4+2],p_data[ofs*4+3]);
} break;
case FORMAT_INDEXED_ALPHA: {
int pitch = 4;
const uint8_t* pal = &p_data[ p_data_size - pitch * 256 ];
int idx = p_data[ofs];
result=BColor(pal[idx * pitch + 0] , pal[idx * pitch + 1] , pal[idx * pitch + 2] , pal[idx * pitch + 3] );
} break;
case FORMAT_INDEXED: {
int pitch = 3;
const uint8_t* pal = &p_data[ p_data_size - pitch * 256 ];
int idx = p_data[ofs];
result=BColor(pal[idx * pitch + 0] , pal[idx * pitch + 1] , pal[idx * pitch + 2] ,255);
} break;
case FORMAT_YUV_422: {
int y, u, v;
if (p_x % 2) {
const uint8_t* yp = &p_data[p_width * 2 * p_y + p_x * 2];
u = *(yp-1);
y = yp[0];
v = yp[1];
} else {
const uint8_t* yp = &p_data[p_width * 2 * p_y + p_x * 2];
y = yp[0];
u = yp[1];
v = yp[3];
};
int32_t r = 1.164 * (y - 16) + 1.596 * (v - 128);
int32_t g = 1.164 * (y - 16) - 0.813 * (v - 128) - 0.391 * (u - 128);
int32_t b = 1.164 * (y - 16) + 2.018 * (u - 128);
result = BColor(CLAMP(r, 0, 255), CLAMP(g, 0, 255), CLAMP(b, 0, 255));
} break;
case FORMAT_YUV_444: {
uint8_t y, u, v;
const uint8_t* yp = &p_data[p_width * 3 * p_y + p_x * 3];
y = yp[0];
u = yp[1];
v = yp[2];
int32_t r = 1.164 * (y - 16) + 1.596 * (v - 128);
int32_t g = 1.164 * (y - 16) - 0.813 * (v - 128) - 0.391 * (u - 128);
int32_t b = 1.164 * (y - 16) + 2.018 * (u - 128);
result = BColor(CLAMP(r, 0, 255), CLAMP(g, 0, 255), CLAMP(b, 0, 255));
} break;
default:{}
}
return result;
}
void Image::put_indexed_pixel(int p_x, int p_y, uint8_t p_idx,int p_mipmap) {
ERR_FAIL_COND(format != FORMAT_INDEXED && format != FORMAT_INDEXED_ALPHA);
ERR_FAIL_INDEX(p_mipmap,mipmaps+1);
int ofs,w,h;
_get_mipmap_offset_and_size(p_mipmap,ofs,w,h);
ERR_FAIL_INDEX(p_x,w);
ERR_FAIL_INDEX(p_y,h);
data.set(ofs + p_y * w + p_x, p_idx);
};
uint8_t Image::get_indexed_pixel(int p_x, int p_y,int p_mipmap) const {
ERR_FAIL_COND_V(format != FORMAT_INDEXED && format != FORMAT_INDEXED_ALPHA, 0);
ERR_FAIL_INDEX_V(p_mipmap,mipmaps+1,0);
int ofs,w,h;
_get_mipmap_offset_and_size(p_mipmap,ofs,w,h);
ERR_FAIL_INDEX_V(p_x,w,0);
ERR_FAIL_INDEX_V(p_y,h,0);
return data[ofs + p_y * w + p_x];
};
void Image::set_pallete(const DVector<uint8_t>& p_data) {
int len = p_data.size();
ERR_FAIL_COND(format != FORMAT_INDEXED && format != FORMAT_INDEXED_ALPHA);
ERR_FAIL_COND(format == FORMAT_INDEXED && len!=(256*3));
ERR_FAIL_COND(format == FORMAT_INDEXED_ALPHA && len!=(256*4));
int ofs,w,h;
_get_mipmap_offset_and_size(mipmaps+1,ofs,w,h);
int pal_ofs = ofs;
data.resize(pal_ofs + p_data.size());
DVector<uint8_t>::Write wp = data.write();
unsigned char *dst=wp.ptr() + pal_ofs;
DVector<uint8_t>::Read r = data.read();
const unsigned char *src=r.ptr();
copymem(dst, src, len);
};
int Image::get_width() const {
return width;
}
int Image::get_height() const{
return height;
}
int Image::get_mipmaps() const {
return mipmaps;
}
Color Image::get_pixel(int p_x,int p_y,int p_mipmap) const {
ERR_FAIL_INDEX_V(p_mipmap,mipmaps+1,Color());
int ofs,w,h;
_get_mipmap_offset_and_size(p_mipmap,ofs,w,h);
ERR_FAIL_INDEX_V(p_x,w,Color());
ERR_FAIL_INDEX_V(p_y,h,Color());
int len = data.size();
DVector<uint8_t>::Read r = data.read();
const unsigned char*data_ptr=r.ptr();
BColor c = _get_pixelw(p_x,p_y,w,&data_ptr[ofs],len);
return Color( c.r/255.0,c.g/255.0,c.b/255.0,c.a/255.0 );
}
void Image::convert( Format p_new_format ){
if (data.size()==0)
return;
if (p_new_format==format)
return;
if (format>=FORMAT_BC1 || p_new_format>=FORMAT_BC1) {
ERR_EXPLAIN("Cannot convert to <-> from compressed/custom image formats (for now).");
ERR_FAIL();
}
if (p_new_format==FORMAT_INDEXED || p_new_format==FORMAT_INDEXED_ALPHA) {
return;
}
Image new_img(width,height,0,p_new_format);
int len=data.size();
DVector<uint8_t>::Read r = data.read();
DVector<uint8_t>::Write w = new_img.data.write();
const uint8_t *rptr = r.ptr();
uint8_t *wptr = w.ptr();
if (p_new_format==FORMAT_RGBA && format==FORMAT_INDEXED_ALPHA) {
//optimized unquantized form
int dataend = len-256*4;
const uint32_t *palpos = (const uint32_t*)&rptr[dataend];
uint32_t *dst32 = (uint32_t *)wptr;
for(int i=0;i<dataend;i++)
dst32[i]=palpos[rptr[i]]; //since this is read/write, endianness is not a problem
} else {
//this is temporary, must find a faster way to do it.
for(int i=0;i<width;i++)
for(int j=0;j<height;j++)
new_img._put_pixel(i,j,_get_pixel(i,j,rptr,len),wptr);
}
r = DVector<uint8_t>::Read();
w = DVector<uint8_t>::Write();
bool gen_mipmaps=mipmaps>0;
*this=new_img;
if (gen_mipmaps)
generate_mipmaps();
}
Image::Format Image::get_format() const{
return format;
}
static double _bicubic_interp_kernel( double x ) {
x = ABS(x);
double bc = 0;
if ( x <= 1 )
bc = ( 1.5 * x - 2.5 ) * x * x + 1;
else if ( x < 2 )
bc = ( ( -0.5 * x + 2.5 ) * x - 4 ) * x + 2;
return bc;
}
template<int CC>
static void _scale_cubic(const uint8_t* p_src, uint8_t* p_dst, uint32_t p_src_width, uint32_t p_src_height, uint32_t p_dst_width, uint32_t p_dst_height) {
// get source image size
int width = p_src_width;
int height = p_src_height;
double xfac = (double) width / p_dst_width;
double yfac = (double) height / p_dst_height;
// coordinates of source points and cooefficiens
double ox, oy, dx, dy, k1, k2;
int ox1, oy1, ox2, oy2;
// destination pixel values
// width and height decreased by 1
int ymax = height - 1;
int xmax = width - 1;
// temporary pointer
for ( int y = 0; y < p_dst_height; y++ ) {
// Y coordinates
oy = (double) y * yfac - 0.5f;
oy1 = (int) oy;
dy = oy - (double) oy1;
for ( int x = 0; x < p_dst_width; x++ ) {
// X coordinates
ox = (double) x * xfac - 0.5f;
ox1 = (int) ox;
dx = ox - (double) ox1;
// initial pixel value
uint8_t *dst=p_dst + (y*p_dst_width+x)*CC;
double color[CC];
for(int i=0;i<CC;i++) {
color[i]=0;
}
for ( int n = -1; n < 3; n++ ) {
// get Y cooefficient
k1 = _bicubic_interp_kernel( dy - (double) n );
oy2 = oy1 + n;
if ( oy2 < 0 )
oy2 = 0;
if ( oy2 > ymax )
oy2 = ymax;
for ( int m = -1; m < 3; m++ ) {
// get X cooefficient
k2 = k1 * _bicubic_interp_kernel( (double) m - dx );
ox2 = ox1 + m;
if ( ox2 < 0 )
ox2 = 0;
if ( ox2 > xmax )
ox2 = xmax;
// get pixel of original image
const uint8_t *p = p_src + (oy2 * p_src_width + ox2)*CC;
for(int i=0;i<CC;i++) {
color[i]+=p[i]*k2;
}
}
}
for(int i=0;i<CC;i++) {
dst[i]=CLAMP(Math::fast_ftoi(color[i]),0,255);
}
}
}
}
template<int CC>
static void _scale_bilinear(const uint8_t* p_src, uint8_t* p_dst, uint32_t p_src_width, uint32_t p_src_height, uint32_t p_dst_width, uint32_t p_dst_height) {
enum {
FRAC_BITS=8,
FRAC_LEN=(1<<FRAC_BITS),
FRAC_MASK=FRAC_LEN-1
};
for(uint32_t i=0;i<p_dst_height;i++) {
uint32_t src_yofs_up_fp = (i*p_src_height*FRAC_LEN/p_dst_height);
uint32_t src_yofs_frac = src_yofs_up_fp & FRAC_MASK;
uint32_t src_yofs_up = src_yofs_up_fp >> FRAC_BITS;
uint32_t src_yofs_down = (i+1)*p_src_height/p_dst_height;
if (src_yofs_down>=p_src_height)
src_yofs_down=p_src_height-1;
//src_yofs_up*=CC;
//src_yofs_down*=CC;
uint32_t y_ofs_up = src_yofs_up * p_src_width * CC;
uint32_t y_ofs_down = src_yofs_down * p_src_width * CC;
for(uint32_t j=0;j<p_dst_width;j++) {
uint32_t src_xofs_left_fp = (j*p_src_width*FRAC_LEN/p_dst_width);
uint32_t src_xofs_frac = src_xofs_left_fp & FRAC_MASK;
uint32_t src_xofs_left = src_xofs_left_fp >> FRAC_BITS;
uint32_t src_xofs_right = (j+1)*p_src_width/p_dst_width;
if (src_xofs_right>=p_src_width)
src_xofs_right=p_src_width-1;
src_xofs_left*=CC;
src_xofs_right*=CC;
for(uint32_t l=0;l<CC;l++) {
uint32_t p00=p_src[y_ofs_up+src_xofs_left+l]<<FRAC_BITS;
uint32_t p10=p_src[y_ofs_up+src_xofs_right+l]<<FRAC_BITS;
uint32_t p01=p_src[y_ofs_down+src_xofs_left+l]<<FRAC_BITS;
uint32_t p11=p_src[y_ofs_down+src_xofs_right+l]<<FRAC_BITS;
uint32_t interp_up = p00+(((p10-p00)*src_xofs_frac)>>FRAC_BITS);
uint32_t interp_down = p01+(((p11-p01)*src_xofs_frac)>>FRAC_BITS);
uint32_t interp = interp_up+(((interp_down-interp_up)*src_yofs_frac)>>FRAC_BITS);
interp>>=FRAC_BITS;
p_dst[i*p_dst_width*CC+j*CC+l]=interp;
}
}
}
}
template<int CC>
static void _scale_nearest(const uint8_t* p_src, uint8_t* p_dst, uint32_t p_src_width, uint32_t p_src_height, uint32_t p_dst_width, uint32_t p_dst_height) {
for(uint32_t i=0;i<p_dst_height;i++) {
uint32_t src_yofs = i*p_src_height/p_dst_height;
uint32_t y_ofs = src_yofs * p_src_width * CC;
for(uint32_t j=0;j<p_dst_width;j++) {
uint32_t src_xofs = j*p_src_width/p_dst_width;
src_xofs*=CC;
for(uint32_t l=0;l<CC;l++) {
uint32_t p=p_src[y_ofs+src_xofs+l];
p_dst[i*p_dst_width*CC+j*CC+l]=p;
}
}
}
}
void Image::resize_to_po2(bool p_square) {
if (!_can_modify(format)) {
ERR_EXPLAIN("Cannot resize in indexed, compressed or custom image formats.");
ERR_FAIL();
}
int w = nearest_power_of_2(width);
int h = nearest_power_of_2(height);
if (w==width && h==height) {
if (!p_square || w==h)
return; //nothing to do
}
resize(w,h);
}
Image Image::resized( int p_width, int p_height, int p_interpolation ) {
Image ret = *this;
ret.resize(p_width, p_height, (Interpolation)p_interpolation);
return ret;
};
void Image::resize( int p_width, int p_height, Interpolation p_interpolation ) {
if (!_can_modify(format)) {
ERR_EXPLAIN("Cannot resize in indexed, compressed or custom image formats.");
ERR_FAIL();
}
ERR_FAIL_COND(p_width<=0);
ERR_FAIL_COND(p_height<=0);
ERR_FAIL_COND(p_width>MAX_WIDTH);
ERR_FAIL_COND(p_height>MAX_HEIGHT);
if (p_width==width && p_height==height)
return;
Image dst( p_width, p_height, 0, format );
if (format==FORMAT_INDEXED)
p_interpolation=INTERPOLATE_NEAREST;
DVector<uint8_t>::Read r = data.read();
const unsigned char*r_ptr=r.ptr();
DVector<uint8_t>::Write w = dst.data.write();
unsigned char*w_ptr=w.ptr();
switch(p_interpolation) {
case INTERPOLATE_NEAREST: {
switch(get_format_pixel_size(format)) {
case 1: _scale_nearest<1>(r_ptr,w_ptr,width,height,p_width,p_height); break;
case 2: _scale_nearest<2>(r_ptr,w_ptr,width,height,p_width,p_height); break;
case 3: _scale_nearest<3>(r_ptr,w_ptr,width,height,p_width,p_height); break;
case 4: _scale_nearest<4>(r_ptr,w_ptr,width,height,p_width,p_height); break;
}
} break;
case INTERPOLATE_BILINEAR: {
switch(get_format_pixel_size(format)) {
case 1: _scale_bilinear<1>(r_ptr,w_ptr,width,height,p_width,p_height); break;
case 2: _scale_bilinear<2>(r_ptr,w_ptr,width,height,p_width,p_height); break;
case 3: _scale_bilinear<3>(r_ptr,w_ptr,width,height,p_width,p_height); break;
case 4: _scale_bilinear<4>(r_ptr,w_ptr,width,height,p_width,p_height); break;
}
} break;
case INTERPOLATE_CUBIC: {
switch(get_format_pixel_size(format)) {
case 1: _scale_cubic<1>(r_ptr,w_ptr,width,height,p_width,p_height); break;
case 2: _scale_cubic<2>(r_ptr,w_ptr,width,height,p_width,p_height); break;
case 3: _scale_cubic<3>(r_ptr,w_ptr,width,height,p_width,p_height); break;
case 4: _scale_cubic<4>(r_ptr,w_ptr,width,height,p_width,p_height); break;
}
} break;
}
r = DVector<uint8_t>::Read();
w = DVector<uint8_t>::Write();
if (mipmaps>0)
dst.generate_mipmaps();
*this=dst;
}
void Image::crop( int p_width, int p_height ) {
if (!_can_modify(format)) {
ERR_EXPLAIN("Cannot crop in indexed, compressed or custom image formats.");
ERR_FAIL();
}
ERR_FAIL_COND(p_width<=0);
ERR_FAIL_COND(p_height<=0);
ERR_FAIL_COND(p_width>MAX_WIDTH);
ERR_FAIL_COND(p_height>MAX_HEIGHT);
/* to save memory, cropping should be done in-place, however, since this function
will most likely either not be used much, or in critical areas, for now it wont, because
it's a waste of time. */
if (p_width==width && p_height==height)
return;
Image dst( p_width, p_height,0, format );
for (int y=0;y<p_height;y++) {
for (int x=0;x<p_width;x++) {
Color col = (x>=width || y>=height)? Color() : get_pixel(x,y);
dst.put_pixel(x,y,col);
}
}
if (mipmaps>0)
dst.generate_mipmaps();
*this=dst;
}
void Image::flip_y() {
if (!_can_modify(format)) {
ERR_EXPLAIN("Cannot flip_y in indexed, compressed or custom image formats.");
ERR_FAIL();
}
bool gm=mipmaps;
if (gm)
clear_mipmaps();;
for (int y=0;y<(height/2);y++) {
for (int x=0;x<width;x++) {
Color up = get_pixel(x,y);
Color down = get_pixel(x,height-y-1);
put_pixel(x,y,down);
put_pixel(x,height-y-1,up);
}
}
if (gm)
generate_mipmaps();;
}
void Image::flip_x() {
if (!_can_modify(format)) {
ERR_EXPLAIN("Cannot flip_x in indexed, compressed or custom image formats.");
ERR_FAIL();
}
bool gm=mipmaps;
if (gm)
clear_mipmaps();;
for (int y=0;y<(height/2);y++) {
for (int x=0;x<width;x++) {
Color up = get_pixel(x,y);
Color down = get_pixel(width-x-1,y);
put_pixel(x,y,down);
put_pixel(width-x-1,y,up);
}
}
if (gm)
generate_mipmaps();;
}
int Image::_get_dst_image_size(int p_width, int p_height, Format p_format,int &r_mipmaps,int p_mipmaps) {
int size=0;
int w=p_width;
int h=p_height;
int mm=0;
int pixsize=get_format_pixel_size(p_format);
int pixshift=get_format_pixel_rshift(p_format);
int minw,minh;
_get_format_min_data_size(p_format,minw,minh);
switch(p_format) {
case FORMAT_INDEXED: pixsize=1; size=256*3; break;
case FORMAT_INDEXED_ALPHA: pixsize=1; size=256*4;break;
default: {}
} ;
while(true) {
int s = w*h;
s*=pixsize;
s>>=pixshift;
size+=s;
if (p_mipmaps>=0 && mm==p_mipmaps)
break;
if (p_mipmaps>=0) {
w=MAX(minw,w>>1);
h=MAX(minh,h>>1);
} else {
if (w==minw && h==minh)
break;
w=MAX(minw,w>>1);
h=MAX(minh,h>>1);
}
mm++;
};
r_mipmaps=mm;
return size;
}
bool Image::_can_modify(Format p_format) const {
switch(p_format) {
//these are OK
case FORMAT_GRAYSCALE:
case FORMAT_INTENSITY:
case FORMAT_GRAYSCALE_ALPHA:
case FORMAT_RGB:
case FORMAT_RGBA:
return true;
default:
return false;
}
return false;
}
template<int CC>
static void _generate_po2_mipmap(const uint8_t* p_src, uint8_t* p_dst, uint32_t p_width, uint32_t p_height) {
//fast power of 2 mipmap generation
uint32_t dst_w = p_width >> 1;
uint32_t dst_h = p_height >> 1;
for(uint32_t i=0;i<dst_h;i++) {
const uint8_t *rup_ptr = &p_src[i*2*p_width*CC];
const uint8_t *rdown_ptr = rup_ptr + p_width * CC;
uint8_t *dst_ptr = &p_dst[i*dst_w*CC];
uint32_t count=dst_w;
while(count--) {
for(int j=0;j<CC;j++) {
uint16_t val=0;
val+=rup_ptr[j];
val+=rup_ptr[j+CC];
val+=rdown_ptr[j];
val+=rdown_ptr[j+CC];
dst_ptr[j]=val>>2;
}
dst_ptr+=CC;
rup_ptr+=CC*2;
rdown_ptr+=CC*2;
}
}
}
Error Image::generate_mipmaps(int p_mipmaps,bool p_keep_existing) {
if (!_can_modify(format)) {
ERR_EXPLAIN("Cannot generate mipmaps in indexed, compressed or custom image formats.");
ERR_FAIL_V(ERR_UNAVAILABLE);
}
int from_mm=1;
if (p_keep_existing) {
from_mm=mipmaps+1;
}
int size = _get_dst_image_size(width,height,format,mipmaps,p_mipmaps);
data.resize(size);
DVector<uint8_t>::Write wp=data.write();
if (nearest_power_of_2(width)==uint32_t(width) && nearest_power_of_2(height)==uint32_t(height)) {
//use fast code for powers of 2
int prev_ofs=0;
int prev_h=height;
int prev_w=width;
for(int i=1;i<mipmaps;i++) {
int ofs,w,h;
_get_mipmap_offset_and_size(i,ofs, w,h);
if (i>=from_mm) {
switch(format) {
case FORMAT_GRAYSCALE:
case FORMAT_INTENSITY: _generate_po2_mipmap<1>(&wp[prev_ofs], &wp[ofs], prev_w,prev_h); break;
case FORMAT_GRAYSCALE_ALPHA: _generate_po2_mipmap<2>(&wp[prev_ofs], &wp[ofs], prev_w,prev_h); break;
case FORMAT_RGB: _generate_po2_mipmap<3>(&wp[prev_ofs], &wp[ofs], prev_w,prev_h); break;
case FORMAT_RGBA: _generate_po2_mipmap<4>(&wp[prev_ofs], &wp[ofs], prev_w,prev_h); break;
default: {}
}
}
prev_ofs=ofs;
prev_w=w;
prev_h=h;
}
} else {
//use slow code..
//use bilinear filtered code for non powers of 2
int prev_ofs=0;
int prev_h=height;
int prev_w=width;
for(int i=1;i<mipmaps;i++) {
int ofs,w,h;
_get_mipmap_offset_and_size(i,ofs, w,h);
if (i>=from_mm) {
switch(format) {
case FORMAT_GRAYSCALE:
case FORMAT_INTENSITY: _scale_bilinear<1>(&wp[prev_ofs], &wp[ofs], prev_w,prev_h,w,h); break;
case FORMAT_GRAYSCALE_ALPHA: _scale_bilinear<2>(&wp[prev_ofs], &wp[ofs], prev_w,prev_h,w,h); break;
case FORMAT_RGB: _scale_bilinear<3>(&wp[prev_ofs], &wp[ofs], prev_w,prev_h,w,h); break;
case FORMAT_RGBA: _scale_bilinear<4>(&wp[prev_ofs], &wp[ofs], prev_w,prev_h,w,h); break;
default: {}
}
}
prev_ofs=ofs;
prev_w=w;
prev_h=h;
}
}
return OK;
}
void Image::clear_mipmaps() {
if (mipmaps==0)
return;
if (format==FORMAT_CUSTOM) {
ERR_EXPLAIN("Cannot clear mipmaps in indexed, compressed or custom image formats.");
ERR_FAIL();
}
if (empty())
return;
int ofs,w,h;
_get_mipmap_offset_and_size(1,ofs,w,h);
int palsize = get_format_pallete_size(format);
DVector<uint8_t> pallete;
ERR_FAIL_COND(ofs+palsize > data.size()); //bug?
if (palsize) {
pallete.resize(palsize);
DVector<uint8_t>::Read r = data.read();
DVector<uint8_t>::Write w = pallete.write();
copymem(&w[0],&r[data.size()-palsize],palsize);
}
data.resize(ofs+palsize);
if (palsize) {
DVector<uint8_t>::Read r = pallete.read();
DVector<uint8_t>::Write w = data.write();