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/*
RGBAImage.cpp
Copyright (C) 2006 Yangli Hector Yee
(This entire file was rewritten by Jim Tilander)
This program is free software; you can redistribute it and/or modify it under the terms of the
GNU General Public License as published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program;
if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "RGBAImage.h"
#include "FreeImage.h"
#include <cstdio>
#include <cstring>
RGBAImage* RGBAImage::DownSample() const {
if (Width <=1 || Height <=1) return NULL;
int nw = Width / 2;
int nh = Height / 2;
RGBAImage* img = new RGBAImage(nw, nh, Name.c_str());
for (int y = 0; y < nh; y++) {
for (int x = 0; x < nw; x++) {
int d[4];
// Sample a 2x2 patch from the parent image.
d[0] = Get(2 * x + 0, 2 * y + 0);
d[1] = Get(2 * x + 1, 2 * y + 0);
d[2] = Get(2 * x + 0, 2 * y + 1);
d[3] = Get(2 * x + 1, 2 * y + 1);
int rgba = 0;
// Find the average color.
for (int i = 0; i < 4; i++) {
int c = (d[0] >> (8 * i)) & 0xFF;
c += (d[1] >> (8 * i)) & 0xFF;
c += (d[2] >> (8 * i)) & 0xFF;
c += (d[3] >> (8 * i)) & 0xFF;
c /= 4;
rgba |= (c & 0xFF) << (8 * i);
}
img->Set(x, y, rgba);
}
}
return img;
}
bool RGBAImage::WriteToFile(const char* filename)
{
const FREE_IMAGE_FORMAT fileType = FreeImage_GetFIFFromFilename(filename);
if(FIF_UNKNOWN == fileType)
{
printf("Can't save to unknown filetype %s\n", filename);
return false;
}
FIBITMAP* bitmap = FreeImage_Allocate(Width, Height, 32, 0x000000ff, 0x0000ff00, 0x00ff0000);
if(!bitmap)
{
printf("Failed to create freeimage for %s\n", filename);
return false;
}
const unsigned int* source = Data;
for( int y=0; y < Height; y++, source += Width )
{
unsigned int* scanline = (unsigned int*)FreeImage_GetScanLine(bitmap, Height - y - 1 );
memcpy(scanline, source, sizeof(source[0]) * Width);
}
FreeImage_SetTransparent(bitmap, false);
FIBITMAP* converted = FreeImage_ConvertTo24Bits(bitmap);
const bool result = !!FreeImage_Save(fileType, converted, filename);
if(!result)
printf("Failed to save to %s\n", filename);
FreeImage_Unload(converted);
FreeImage_Unload(bitmap);
return result;
}
RGBAImage* RGBAImage::ReadFromFile(const char* filename)
{
const FREE_IMAGE_FORMAT fileType = FreeImage_GetFileType(filename);
if(FIF_UNKNOWN == fileType)
{
printf("Unknown filetype %s\n", filename);
return 0;
}
FIBITMAP* freeImage = 0;
if(FIBITMAP* temporary = FreeImage_Load(fileType, filename, 0))
{
freeImage = FreeImage_ConvertTo32Bits(temporary);
FreeImage_Unload(temporary);
}
if(!freeImage)
{
printf( "Failed to load the image %s\n", filename);
return 0;
}
const int w = FreeImage_GetWidth(freeImage);
const int h = FreeImage_GetHeight(freeImage);
RGBAImage* result = new RGBAImage(w, h, filename);
// Copy the image over to our internal format, FreeImage has the scanlines bottom to top though.
unsigned int* dest = result->Data;
for( int y=0; y < h; y++, dest += w )
{
const unsigned int* scanline = (const unsigned int*)FreeImage_GetScanLine(freeImage, h - y - 1 );
memcpy(dest, scanline, sizeof(dest[0]) * w);
}
FreeImage_Unload(freeImage);
return result;
}
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