/******************************************************************************
*
*
*
*
* Copyright (C) 1997-2015 by Dimitri van Heesch.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation under the terms of the GNU General Public License is hereby
* granted. No representations are made about the suitability of this software
* for any purpose. It is provided "as is" without express or implied warranty.
* See the GNU General Public License for more details.
*
* Documents produced by Doxygen are derivative works derived from the
* input used in their production; they are not affected by this license.
*
*/
#include "image.h"
#include <qfile.h>
#include <math.h>
#include "lodepng.h"
#include "config.h"
typedef unsigned char Byte;
/** Helper struct representing a RGBA color */
struct Color
{
Byte red;
Byte green;
Byte blue;
Byte alpha;
};
const int charSetWidth=80;
const int charHeight=12;
const int numChars=96;
unsigned short charPos[numChars] =
{
0, 5, 8, 13, 20, 27, 38, 47,
50, 54, 58, 65, 72, 76, 83, 87,
91, 98,105,112,119,126,133,140,
147,154,161,164,167,174,181,188,
195,207,216,224,233,242,250,258,
267,276,279,286,294,301,312,321,
331,339,349,357,365,372,380,389,
400,409,418,427,430,434,437,443,
450,453,460,467,474,481,488,492,
499,506,509,512,518,521,530,537,
544,551,557,562,568,571,578,585,
594,600,607,613,617,620,624,631
};
unsigned char charWidth[numChars] =
{
5, 3, 5, 7, 7,11, 9, 3,
4, 4, 7, 7, 4, 7, 4, 4,
7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 3, 3, 7, 7, 7, 7,
12, 9, 8, 9, 9, 8, 8, 9,
9, 3, 7, 8, 7,11, 9,10,
8,10, 8, 8, 7, 8, 9,11,
9, 9, 9, 3, 4, 3, 6, 7,
3, 7, 7, 7, 7, 7, 4, 7,
7, 3, 3, 6, 3, 9, 7, 7,
7, 6, 5, 6, 3, 7, 7, 9,
6, 7, 6, 4, 3, 4, 7, 5
};
unsigned char fontRaw[charSetWidth*charHeight] = {
0x02, 0x50, 0x01, 0x06, 0x20, 0x60, 0xc6, 0x04, 0x00, 0x00, 0x00, 0x27,
0x04, 0x1c, 0x38, 0x11, 0xf1, 0xc7, 0xc7, 0x0e, 0x00, 0x00, 0x00, 0x03,
0x81, 0xf0, 0x10, 0x7c, 0x1e, 0x3e, 0x1f, 0x9f, 0x87, 0x88, 0x24, 0x09,
0x09, 0x02, 0x02, 0x41, 0x0f, 0x0f, 0x83, 0xc3, 0xe1, 0xe7, 0xf4, 0x24,
0x12, 0x22, 0x41, 0x20, 0x9f, 0xce, 0x30, 0x00, 0x10, 0x04, 0x00, 0x01,
0x00, 0x30, 0x08, 0x12, 0x41, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40,
0x00, 0x00, 0x00, 0x00, 0x01, 0xac, 0x00, 0x00, 0x02, 0x51, 0x43, 0x89,
0x40, 0x90, 0x49, 0x15, 0x00, 0x00, 0x00, 0x28, 0x9c, 0x22, 0x44, 0x31,
0x02, 0x20, 0x48, 0x91, 0x00, 0x00, 0x00, 0x04, 0x46, 0x08, 0x28, 0x42,
0x21, 0x21, 0x10, 0x10, 0x08, 0x48, 0x24, 0x09, 0x11, 0x03, 0x06, 0x61,
0x10, 0x88, 0x44, 0x22, 0x12, 0x10, 0x84, 0x24, 0x12, 0x22, 0x22, 0x20,
0x80, 0x4a, 0x11, 0x00, 0x20, 0x04, 0x00, 0x01, 0x00, 0x40, 0x08, 0x00,
0x41, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00,
0x02, 0x22, 0x00, 0x00, 0x02, 0x51, 0x45, 0x49, 0x40, 0x90, 0x89, 0x0a,
0x00, 0x00, 0x00, 0x48, 0x84, 0x02, 0x04, 0x51, 0x02, 0x00, 0x88, 0x91,
0x00, 0x00, 0x00, 0x04, 0x44, 0xd4, 0x28, 0x42, 0x40, 0x20, 0x90, 0x10,
0x10, 0x08, 0x24, 0x09, 0x21, 0x03, 0x06, 0x51, 0x20, 0x48, 0x48, 0x12,
0x12, 0x00, 0x84, 0x22, 0x22, 0x22, 0x22, 0x11, 0x00, 0x89, 0x12, 0x80,
0x31, 0xc5, 0x87, 0x0d, 0x1c, 0xe3, 0x4b, 0x12, 0x49, 0x29, 0x16, 0x1c,
0x58, 0x69, 0x4c, 0xe8, 0x91, 0x44, 0x61, 0x44, 0xf2, 0x22, 0x00, 0x00,
0x02, 0x07, 0xe5, 0x06, 0x80, 0x60, 0x10, 0x95, 0x08, 0x00, 0x00, 0x48,
0x84, 0x04, 0x18, 0x51, 0xe2, 0xc0, 0x87, 0x11, 0x24, 0x18, 0x03, 0x00,
0x89, 0x24, 0x44, 0x42, 0x40, 0x20, 0x90, 0x10, 0x10, 0x08, 0x24, 0x09,
0x41, 0x02, 0x8a, 0x51, 0x20, 0x48, 0x48, 0x12, 0x11, 0x80, 0x84, 0x22,
0x21, 0x24, 0x14, 0x11, 0x01, 0x09, 0x14, 0x40, 0x02, 0x26, 0x48, 0x93,
0x22, 0x44, 0xcc, 0x92, 0x51, 0x36, 0x99, 0x22, 0x64, 0x99, 0x92, 0x48,
0x91, 0x44, 0x52, 0x44, 0x12, 0x22, 0x00, 0x00, 0x02, 0x01, 0x43, 0x80,
0x80, 0xa0, 0x10, 0x84, 0x08, 0x00, 0x00, 0x88, 0x84, 0x08, 0x04, 0x90,
0x13, 0x21, 0x08, 0x8f, 0x00, 0x61, 0xf0, 0xc0, 0x8a, 0x24, 0x44, 0x7c,
0x40, 0x20, 0x9f, 0x9f, 0x11, 0xcf, 0xe4, 0x09, 0xc1, 0x02, 0x8a, 0x49,
0x20, 0x4f, 0x88, 0x13, 0xe0, 0x60, 0x84, 0x22, 0x21, 0x54, 0x08, 0x0a,
0x02, 0x08, 0x90, 0x00, 0x00, 0x24, 0x48, 0x11, 0x22, 0x44, 0x48, 0x92,
0x61, 0x24, 0x91, 0x22, 0x44, 0x89, 0x10, 0x48, 0x91, 0x24, 0x8c, 0x44,
0x22, 0x22, 0x64, 0x00, 0x02, 0x07, 0xe1, 0x41, 0x31, 0x14, 0x10, 0x80,
0x3e, 0x07, 0xc0, 0x88, 0x84, 0x10, 0x05, 0x10, 0x12, 0x21, 0x08, 0x81,
0x01, 0x80, 0x00, 0x31, 0x0a, 0x24, 0x7c, 0x42, 0x40, 0x20, 0x90, 0x10,
0x10, 0x48, 0x24, 0x09, 0x21, 0x02, 0x52, 0x45, 0x20, 0x48, 0x08, 0x92,
0x20, 0x10, 0x84, 0x21, 0x41, 0x54, 0x14, 0x04, 0x04, 0x08, 0x90, 0x00,
0x01, 0xe4, 0x48, 0x11, 0x3e, 0x44, 0x48, 0x92, 0x61, 0x24, 0x91, 0x22,
0x44, 0x89, 0x0c, 0x48, 0x8a, 0x24, 0x8c, 0x48, 0x44, 0x21, 0x98, 0x00,
0x02, 0x02, 0x85, 0x41, 0x49, 0x08, 0x10, 0x80, 0x08, 0x00, 0x00, 0x88,
0x84, 0x20, 0x45, 0xf9, 0x12, 0x21, 0x08, 0x81, 0x00, 0x61, 0xf0, 0xc1,
0x0a, 0x68, 0x82, 0x42, 0x40, 0x20, 0x90, 0x10, 0x10, 0x48, 0x24, 0x89,
0x11, 0x02, 0x52, 0x45, 0x20, 0x48, 0x08, 0x52, 0x12, 0x10, 0x84, 0x21,
0x40, 0x88, 0x22, 0x04, 0x08, 0x08, 0x90, 0x00, 0x02, 0x24, 0x48, 0x11,
0x20, 0x44, 0x48, 0x92, 0x51, 0x24, 0x91, 0x22, 0x44, 0x89, 0x02, 0x48,
0x8a, 0x2a, 0x92, 0x28, 0x42, 0x22, 0x00, 0x00, 0x00, 0x02, 0x85, 0x41,
0x49, 0x18, 0x10, 0x80, 0x08, 0x00, 0x01, 0x08, 0x84, 0x20, 0x44, 0x11,
0x12, 0x22, 0x08, 0x91, 0x00, 0x18, 0x03, 0x00, 0x09, 0xb0, 0x82, 0x42,
0x21, 0x21, 0x10, 0x10, 0x08, 0xc8, 0x24, 0x89, 0x09, 0x02, 0x22, 0x43,
0x10, 0x88, 0x04, 0x22, 0x12, 0x10, 0x84, 0x20, 0x80, 0x88, 0x22, 0x04,
0x10, 0x08, 0x50, 0x00, 0x02, 0x26, 0x48, 0x93, 0x22, 0x44, 0xc8, 0x92,
0x49, 0x24, 0x91, 0x22, 0x64, 0x99, 0x12, 0x49, 0x84, 0x11, 0x21, 0x28,
0x82, 0x22, 0x00, 0x00, 0x02, 0x02, 0x83, 0x82, 0x30, 0xe4, 0x10, 0x80,
0x00, 0x20, 0x05, 0x07, 0x04, 0x3e, 0x38, 0x10, 0xe1, 0xc2, 0x07, 0x0e,
0x24, 0x00, 0x00, 0x01, 0x04, 0x00, 0x82, 0x7c, 0x1e, 0x3e, 0x1f, 0x90,
0x07, 0x48, 0x24, 0x71, 0x05, 0xf2, 0x22, 0x41, 0x0f, 0x08, 0x03, 0xd2,
0x11, 0xe0, 0x83, 0xc0, 0x80, 0x88, 0x41, 0x04, 0x1f, 0xc8, 0x50, 0x00,
0x01, 0xd5, 0x87, 0x0d, 0x1c, 0x43, 0x48, 0x92, 0x45, 0x24, 0x91, 0x1c,
0x58, 0x69, 0x0c, 0x66, 0x84, 0x11, 0x21, 0x10, 0xf2, 0x22, 0x00, 0x00,
0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x20, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00,
0x03, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x40, 0x02, 0x00, 0x00, 0x00, 0x00, 0x40, 0x08, 0x00, 0x00,
0x00, 0x00, 0x00, 0x10, 0x02, 0x22, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x09, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x08, 0x10, 0x1f, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x04, 0x40, 0x02,
0x00, 0x00, 0x00, 0x00, 0x40, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20,
0x02, 0x22, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x30, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x80, 0x04, 0x00, 0x00, 0x00, 0x00,
0x40, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x01, 0xac, 0x00, 0x00
};
static Color palette[] =
{
{ 0xff, 0xff, 0xff, 0x00 },
{ 0x00, 0x00, 0x00, 0xff },
{ 0xff, 0xff, 0xc0, 0xff },
{ 0x9f, 0x9f, 0x60, 0xff },
{ 0x90, 0x00, 0x00, 0xff },
{ 0x00, 0x90, 0x00, 0xff },
{ 0x00, 0x00, 0x90, 0xff },
{ 0xc0, 0xc0, 0xc0, 0xff }
};
// for alpha we use x^(1/1.3)
static Color palette2[] =
{
{ 0x00, 0x00, 0x00, 0x00 },
{ 0x00, 0x00, 0x00, 0x2e },
{ 0x00, 0x00, 0x00, 0x48 },
{ 0x00, 0x00, 0x00, 0x5d },
{ 0x00, 0x00, 0x00, 0x6f },
{ 0x00, 0x00, 0x00, 0x80 },
{ 0x00, 0x00, 0x00, 0x8f },
{ 0x00, 0x00, 0x00, 0x9e },
{ 0x00, 0x00, 0x00, 0xac },
{ 0x00, 0x00, 0x00, 0xb9 },
{ 0x00, 0x00, 0x00, 0xc5 },
{ 0x00, 0x00, 0x00, 0xd2 },
{ 0x00, 0x00, 0x00, 0xdd },
{ 0x00, 0x00, 0x00, 0xe9 },
{ 0x00, 0x00, 0x00, 0xf4 },
{ 0x00, 0x00, 0x00, 0xff }
};
static Color palette3[] =
{
{ 0xff, 0xff, 0xff, 0xff },
{ 0xe0, 0xe0, 0xe0, 0xff },
{ 0xd0, 0xd0, 0xd0, 0xff },
{ 0xc0, 0xc0, 0xc0, 0xff },
{ 0xb0, 0xb0, 0xb0, 0xff },
{ 0xa0, 0xa0, 0xa0, 0xff },
{ 0x90, 0x90, 0x90, 0xff },
{ 0x80, 0x80, 0x80, 0xff },
{ 0x70, 0x70, 0x70, 0xff },
{ 0x60, 0x60, 0x60, 0xff },
{ 0x50, 0x50, 0x50, 0xff },
{ 0x40, 0x40, 0x40, 0xff },
{ 0x30, 0x30, 0x30, 0xff },
{ 0x20, 0x20, 0x20, 0xff },
{ 0x10, 0x10, 0x10, 0xff },
{ 0x00, 0x00, 0x00, 0xff }
};
Image::Image(int w,int h)
{
static int hue = Config_getInt(HTML_COLORSTYLE_HUE);
static int sat = Config_getInt(HTML_COLORSTYLE_SAT);
static int gamma = Config_getInt(HTML_COLORSTYLE_GAMMA);
double red1,green1,blue1;
double red2,green2,blue2;
ColoredImage::hsl2rgb(hue/360.0, // hue
sat/255.0, // saturation
pow(235/255.0,gamma/100.0), // luma (gamma corrected)
&red1,&green1,&blue1
);
ColoredImage::hsl2rgb(hue/360.0, // hue
sat/255.0, // saturation
pow(138/255.0,gamma/100.0), // luma (gamma corrected)
&red2,&green2,&blue2
);
palette[2].red = (int)(red1 * 255.0);
palette[2].green = (int)(green1 * 255.0);
palette[2].blue = (int)(blue1 * 255.0);
palette[3].red = (int)(red2 * 255.0);
palette[3].green = (int)(green2 * 255.0);
palette[3].blue = (int)(blue2 * 255.0);
data = new uchar[w*h];
memset(data,0,w*h);
width = w;
height = h;
}
Image::~Image()
{
delete[] data;
}
void Image::setPixel(int x,int y,uchar val)
{
if (x>=0 && x<width && y>=0 && y<height)
data[y*width+x] = val;
}
uchar Image::getPixel(int x,int y) const
{
if (x>=0 && x<width && y>=0 && y<height)
return data[y*width+x];
else
return 0;
}
void Image::writeChar(int x,int y,char c,uchar fg)
{
if (c>=' ')
{
int xf,yf,ci=c-' ';
int rowOffset=0;
int cw = charWidth[ci];
int cp = charPos[ci];
for (yf=0;yf<charHeight;yf++)
{
unsigned short bitPattern=0;
int bitsLeft=cw;
int byteOffset = rowOffset+(cp>>3);
int bitOffset = cp&7;
// get the bit pattern for row yf of the character from the font data
while (bitsLeft>0)
{
int bits=8-bitOffset;
if (bits>bitsLeft) bits=bitsLeft;
bitPattern<<=bits;
bitPattern|=((fontRaw[byteOffset]<<bitOffset)&0xff)>>(8-bits);
bitsLeft-=bits;
bitOffset=0;
byteOffset++;
}
int mask=1<<(cw-1);
// draw character row yf
for (xf=0;xf<cw;xf++)
{
setPixel(x+xf,y+yf,(bitPattern&mask) ? fg : getPixel(x+xf,y+yf));
mask>>=1;
}
rowOffset+=charSetWidth;
}
}
}
void Image::writeString(int x,int y,const char *s,uchar fg)
{
if (s)
{
char c;
while ((c=*s++))
{
writeChar(x,y,c,fg);
x+=charWidth[c-' '];
}
}
}
uint Image::stringLength(const char *s)
{
int w=0;
if (s)
{
char c;
while ((c=*s++)) w+=charWidth[c-' '];
}
return w;
}
void Image::drawHorzLine(int y,int xs,int xe,uchar colIndex,uint mask)
{
int x,i=0,j=0;
for (x=xs;x<=xe;x++,j++)
{
if (j&1) i++;
if (mask&(1<<(i&0x1f))) setPixel(x,y,colIndex);
}
}
void Image::drawHorzArrow(int y,int xs,int xe,uchar colIndex,uint mask)
{
drawHorzLine(y,xs,xe,colIndex,mask);
int i;
for (i=0;i<6;i++)
{
int h=i>>1;
drawVertLine(xe-i,y-h,y+h,colIndex,0xffffffff);
}
}
void Image::drawVertLine(int x,int ys,int ye,uchar colIndex,uint mask)
{
int y,i=0;
for (y=ys;y<=ye;y++,i++)
{
if (mask&(1<<(i&0x1f))) setPixel(x,y,colIndex);
}
}
void Image::drawVertArrow(int x,int ys,int ye,uchar colIndex,uint mask)
{
drawVertLine(x,ys,ye,colIndex,mask);
int i;
for (i=0;i<6;i++)
{
int h=i>>1;
drawHorzLine(ys+i,x-h,x+h,colIndex,0xffffffff);
}
}
void Image::drawRect(int x,int y,int w,int h,uchar colIndex,uint mask)
{
drawHorzLine(y,x,x+w-1,colIndex,mask);
drawHorzLine(y+h-1,x,x+w-1,colIndex,mask);
drawVertLine(x,y,y+h-1,colIndex,mask);
drawVertLine(x+w-1,y,y+h-1,colIndex,mask);
}
void Image::fillRect(int x,int y,int lwidth,int lheight,uchar colIndex,uint mask)
{
int xp,yp,xi,yi;
for (yp=y,yi=0;yp<y+lheight;yp++,yi++)
for (xp=x,xi=0;xp<x+lwidth;xp++,xi++)
if (mask&(1<<((xi+yi)&0x1f)))
setPixel(xp,yp,colIndex);
}
bool Image::save(const char *fileName,int mode)
{
#if 0
GifEncoder gifenc(data,
mode==0 ? palette : palette2,
width,height,
mode==0 ? 3 : 4,
0);
QFile file(fileName);
if (file.open(IO_WriteOnly))
{
gifenc.writeGIF(file);
return TRUE;
}
else
{
return FALSE;
}
#endif
static bool useTransparency = Config_getBool(FORMULA_TRANSPARENT);
uchar* buffer;
size_t bufferSize;
LodePNG_Encoder encoder;
LodePNG_Encoder_init(&encoder);
int numCols = mode==0 ? 8 : 16;
Color *pPal = mode==0 ? palette :
useTransparency ? palette2 :
palette3 ;
int i;
for (i=0;i<numCols;i++,pPal++)
{
LodePNG_InfoColor_addPalette(&encoder.infoPng.color,
pPal->red,pPal->green,pPal->blue,pPal->alpha);
}
encoder.infoPng.color.colorType = 3;
encoder.infoRaw.color.colorType = 3;
LodePNG_encode(&encoder, &buffer, &bufferSize, data, width, height);
LodePNG_saveFile(buffer, bufferSize, fileName);
free(buffer);
LodePNG_Encoder_cleanup(&encoder);
return TRUE;
}
//----------------------------------------------------------------
void ColoredImage::hsl2rgb(double h,double s,double l,
double *pRed,double *pGreen,double *pBlue)
{
double v;
double r,g,b;
r = l; // default to gray
g = l;
b = l;
v = (l <= 0.5) ? (l * (1.0 + s)) : (l + s - l * s);
if (v > 0)
{
double m;
double sv;
int sextant;
double fract, vsf, mid1, mid2;
m = l + l - v;
sv = (v - m ) / v;
h *= 6.0;
sextant = (int)h;
fract = h - sextant;
vsf = v * sv * fract;
mid1 = m + vsf;
mid2 = v - vsf;
switch (sextant)
{
case 0:
r = v;
g = mid1;
b = m;
break;
case 1:
r = mid2;
g = v;
b = m;
break;
case 2:
r = m;
g = v;
b = mid1;
break;
case 3:
r = m;
g = mid2;
b = v;
break;
case 4:
r = mid1;
g = m;
b = v;
break;
case 5:
r = v;
g = m;
b = mid2;
break;
}
}
*pRed = r;
*pGreen = g;
*pBlue = b;
}
ColoredImage::ColoredImage(int width,int height,
const uchar *greyLevels,const uchar *alphaLevels,
int saturation,int hue,int gamma)
{
m_hasAlpha = alphaLevels!=0;
m_width = width;
m_height = height;
m_data = (uchar*)malloc(width*height*4);
int i;
for (i=0;i<width*height;i++)
{
uchar r,g,b,a;
double red,green,blue;
hsl2rgb(hue/360.0, // hue
saturation/255.0, // saturation
pow(greyLevels[i]/255.0,gamma/100.0), // luma (gamma corrected)
&red,&green,&blue);
r = (int)(red *255.0);
g = (int)(green*255.0);
b = (int)(blue *255.0);
a = alphaLevels ? alphaLevels[i] : 255;
m_data[i*4+0]=r;
m_data[i*4+1]=g;
m_data[i*4+2]=b;
m_data[i*4+3]=a;
}
}
ColoredImage::~ColoredImage()
{
free(m_data);
}
bool ColoredImage::save(const char *fileName)
{
uchar *buffer;
size_t bufferSize;
LodePNG_Encoder encoder;
LodePNG_Encoder_init(&encoder);
encoder.infoPng.color.colorType = m_hasAlpha ? 6 : 2; // 2=RGB 24 bit, 6=RGBA 32 bit
encoder.infoRaw.color.colorType = 6; // 6=RGBA 32 bit
LodePNG_encode(&encoder, &buffer, &bufferSize, m_data, m_width, m_height);
LodePNG_saveFile(buffer, bufferSize, fileName);
LodePNG_Encoder_cleanup(&encoder);
free(buffer);
return TRUE;
}