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ImagePNG.cpp
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ImagePNG.cpp
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/*
Copyright (C) 1996-1997 Id Software, Inc.
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 "quakedef.h"
#include "FileManager.h"
#include "Texture.h"
#include "Image.h"
#include <png.h>
typedef struct png_s { // TPng = class(TGraphic)
char *tmpBuf;
int tmpi;
long FBgColor; // DL Background color Added 30/05/2000
int FTransparent; // DL Is this Image Transparent Added 30/05/2000
long FRowBytes; //DL Added 30/05/2000
double FGamma; //DL Added 07/06/2000
double FScreenGamma; //DL Added 07/06/2000
char *FRowPtrs; // DL Changed for consistancy 30/05/2000
char* Data; //property Data: pByte read fData;
char* Title;
char* Author;
char* Description;
int BitDepth;
int BytesPerPixel;
int ColorType;
png_uint_32 Height;
png_uint_32 Width;
int Interlace;
int Compression;
int Filter;
double LastModified;
int Transparent;
} png_t;
png_t *my_png = 0;
unsigned char* pngbytes;
void InitializeDemData() {
long* cvaluep; //ub
// Initialize Data and RowPtrs
if (my_png->Data) {
//MemoryObj::ZFree(my_png->Data);
free(my_png->Data);
my_png->Data = 0;
}
if (my_png->FRowPtrs) {
//MemoryObj::ZFree(my_png->FRowPtrs);
free(my_png->FRowPtrs);
my_png->FRowPtrs = 0;
}
//my_png->Data = MemoryObj::ZAlloc(my_png->Height * my_png->FRowBytes ); // DL Added 30/5/2000
//my_png->FRowPtrs = MemoryObj::ZAlloc(sizeof(void*) * my_png->Height);
my_png->Data = (char *) malloc(my_png->Height * my_png->FRowBytes); // DL Added 30/5/2000
my_png->FRowPtrs = (char *) malloc(sizeof (void*) * my_png->Height);
if ((my_png->Data) && (my_png->FRowPtrs)) {
cvaluep = (long*) my_png->FRowPtrs;
for (unsigned int y = 0; y < my_png->Height; y++) {
cvaluep[y] = (long) my_png->Data + (y * (long) my_png->FRowBytes); //DL Added 08/07/2000
}
}
}
void mypng_struct_create() {
if (my_png) return;
//my_png = MemoryObj::ZAlloc(sizeof(png_t));
my_png = (png_t *) malloc(sizeof (png_t));
my_png->Data = 0;
my_png->FRowPtrs = 0;
my_png->Height = 0;
my_png->Width = 0;
my_png->ColorType = PNG_COLOR_TYPE_RGB;
my_png->Interlace = PNG_INTERLACE_NONE;
my_png->Compression = PNG_COMPRESSION_TYPE_DEFAULT;
my_png->Filter = PNG_FILTER_TYPE_DEFAULT;
}
void mypng_struct_destroy(bool keepData) {
if (!my_png)
return;
if (my_png->Data && !keepData)
//MemoryObj::ZFree(my_png->Data);
free(my_png->Data);
if (my_png->FRowPtrs)
//MemoryObj::ZFree(my_png->FRowPtrs);
free(my_png->FRowPtrs);
//MemoryObj::ZFree(my_png);
free(my_png);
my_png = 0;
}
void PNGAPI fReadData(png_structp png, png_bytep data, png_size_t length) { // called by pnglib
unsigned int i;
for (i = 0; i < length; i++)
data[i] = my_png->tmpBuf[my_png->tmpi++]; // give pnglib a some more bytes
}
void Image::LoadPNG(FILE *f, char *filename, Texture *tex) {
png_structp png;
png_infop pnginfo;
byte ioBuffer[8192];
byte *raw;
int filesize = SystemFileManager::FileLength(f);
raw = (byte *) malloc(filesize + 1);
if (raw == NULL) {
Sys_Error("Out of memory to load PNG: %s\n", filename);
return;
}
fread(raw, 1, filesize, f);
fclose(f);
if (!raw) {
Con_Printf("Bad png file %s\n", filename);
return;
}
if (png_sig_cmp(raw, 0, 4)) {
free(raw);
return;
}
png = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
if (!png) {
free(raw);
return;
}
pnginfo = png_create_info_struct(png);
if (!pnginfo) {
free(raw);
png_destroy_read_struct(&png, &pnginfo, 0);
return;
}
png_set_sig_bytes(png, 0/*sizeof( sig )*/);
mypng_struct_create(); // creates the my_png struct
my_png->tmpBuf = (char *) raw; //buf = whole file content
my_png->tmpi = 0;
png_set_read_fn(png, ioBuffer, fReadData);
png_read_info(png, pnginfo);
png_get_IHDR(png, pnginfo, &my_png->Width, &my_png->Height, &my_png->BitDepth, &my_png->ColorType, &my_png->Interlace, &my_png->Compression, &my_png->Filter);
// ...removed bgColor code here...
if (my_png->ColorType == PNG_COLOR_TYPE_PALETTE)
png_set_palette_to_rgb(png);
if (my_png->ColorType == PNG_COLOR_TYPE_GRAY && my_png->BitDepth < 8)
png_set_expand_gray_1_2_4_to_8(png);
// Add alpha channel if present
if (png_get_valid(png, pnginfo, PNG_INFO_tRNS))
png_set_tRNS_to_alpha(png);
// hax: expand 24bit to 32bit
if (my_png->BitDepth == 8 && my_png->ColorType == PNG_COLOR_TYPE_RGB)
png_set_filler(png, 255, PNG_FILLER_AFTER);
if ((my_png->ColorType == PNG_COLOR_TYPE_GRAY) || (my_png->ColorType == PNG_COLOR_TYPE_GRAY_ALPHA)) {
png_set_gray_to_rgb(png);
png_set_add_alpha(png, 255, PNG_FILLER_AFTER);
}
if (my_png->BitDepth < 8)
png_set_expand(png);
// update the info structure
png_read_update_info(png, pnginfo);
my_png->FRowBytes = png_get_rowbytes(png, pnginfo);
my_png->BytesPerPixel = png_get_channels(png, pnginfo); // DL Added 30/08/2000
InitializeDemData();
if ((my_png->Data) && (my_png->FRowPtrs))
png_read_image(png, (png_bytepp) my_png->FRowPtrs);
png_read_end(png, pnginfo); // read last information chunks
png_destroy_read_struct(&png, &pnginfo, 0);
if (my_png->BitDepth == 8) {
tex->width = my_png->Width;
tex->height = my_png->Height;
tex->bytesPerPixel = my_png->BytesPerPixel;
tex->setData((byte *) my_png->Data);
} else {
Con_Printf("Bad png color depth: %s\n", filename);
free(my_png->Data);
}
free(raw);
mypng_struct_destroy(true);
return;
}