gtkradiant/plugins/imagepng/plugin.cpp

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/*
Copyright (C) 1999-2007 id Software, Inc. and contributors.
For a list of contributors, see the accompanying CONTRIBUTORS file.
This file is part of GtkRadiant.
GtkRadiant 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.
GtkRadiant 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 GtkRadiant; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
// =============================================================================
// global tables
#include "plugin.h"
_QERFuncTable_1 g_FuncTable;
_QERFileSystemTable g_FileSystemTable;
// =============================================================================
// SYNAPSE
#include "synapse.h"
class CSynapseClientImage : public CSynapseClient
{
public:
// CSynapseClient API
bool RequestAPI( APIDescriptor_t *pAPI );
const char* GetInfo();
CSynapseClientImage() { }
virtual ~CSynapseClientImage() { }
};
CSynapseServer* g_pSynapseServer = NULL;
CSynapseClientImage g_SynapseClient;
#if __GNUC__ >= 4
#pragma GCC visibility push(default)
#endif
extern "C" CSynapseClient * SYNAPSE_DLL_EXPORT Synapse_EnumerateInterfaces( const char *version, CSynapseServer *pServer ) {
#if __GNUC__ >= 4
#pragma GCC visibility pop
#endif
if ( strcmp( version, SYNAPSE_VERSION ) ) {
Syn_Printf( "ERROR: synapse API version mismatch: should be '" SYNAPSE_VERSION "', got '%s'\n", version );
return NULL;
}
g_pSynapseServer = pServer;
g_pSynapseServer->IncRef();
Set_Syn_Printf( g_pSynapseServer->Get_Syn_Printf() );
g_SynapseClient.AddAPI( IMAGE_MAJOR, "png", sizeof( _QERPlugImageTable ) );
g_SynapseClient.AddAPI( RADIANT_MAJOR, NULL, sizeof( _QERFuncTable_1 ), SYN_REQUIRE, &g_FuncTable );
// NOTE: if imagepng starts being used for non "VFS" "pk3" config, need to add a dynamic config chunk
g_SynapseClient.AddAPI( VFS_MAJOR, "pk3", sizeof( _QERFileSystemTable ), SYN_REQUIRE, &g_FileSystemTable );
return &g_SynapseClient;
}
bool CSynapseClientImage::RequestAPI( APIDescriptor_t *pAPI ){
if ( !strcmp( pAPI->major_name, IMAGE_MAJOR ) ) {
_QERPlugImageTable* pTable = static_cast<_QERPlugImageTable*>( pAPI->mpTable );
if ( !strcmp( pAPI->minor_name, "png" ) ) {
pTable->m_pfnLoadImage = &LoadImage;
return true;
}
}
Syn_Printf( "ERROR: RequestAPI( '%s' ) not found in '%s'\n", pAPI->major_name, GetInfo() );
return false;
}
#include "version.h"
const char* CSynapseClientImage::GetInfo(){
return "PNG loader module built " __DATE__ " " RADIANT_VERSION;
}
// ====== PNG loader functionality ======
#include "png.h"
#ifdef __APPLE__ //tigital
#include <stdlib.h>
#endif
void user_warning_fn( png_structp png_ptr, png_const_charp warning_msg ){
g_FuncTable.m_pfnSysPrintf( "libpng warning: %s\n", warning_msg );
}
void user_error_fn( png_structp png_ptr, png_const_charp error_msg ){
g_FuncTable.m_pfnSysPrintf( "libpng error: %s\n", error_msg );
longjmp( png_ptr->jmpbuf, 0 );
}
void user_read_data( png_structp png_ptr, png_bytep data, png_uint_32 length ){
png_bytep *p_p_fbuffer = (png_bytep*)png_get_io_ptr( png_ptr );
memcpy( data, *p_p_fbuffer, length );
*p_p_fbuffer += length;
}
void LoadImage( const char *filename, unsigned char **pic, int *width, int *height ){
png_byte** row_pointers;
unsigned char *fbuffer = NULL;
png_bytep p_fbuffer;
int nLen = g_FileSystemTable.m_pfnLoadFile( (char *)filename, (void **)&fbuffer, 0 );
if ( nLen == -1 ) {
return;
}
p_fbuffer = fbuffer;
// the reading glue
// http://www.libpng.org/pub/png/libpng-manual.html
png_structp png_ptr = png_create_read_struct
( PNG_LIBPNG_VER_STRING, NULL,
user_error_fn, user_warning_fn );
if ( !png_ptr ) {
g_FuncTable.m_pfnSysPrintf( "libpng error: png_create_read_struct\n" );
return;
}
png_infop info_ptr = png_create_info_struct( png_ptr );
if ( !info_ptr ) {
png_destroy_read_struct( &png_ptr,
NULL, NULL );
g_FuncTable.m_pfnSysPrintf( "libpng error: png_create_info_struct (info_ptr)\n" );
return;
}
png_infop end_info = png_create_info_struct( png_ptr );
if ( !end_info ) {
png_destroy_read_struct( &png_ptr, &info_ptr,
NULL );
g_FuncTable.m_pfnSysPrintf( "libpng error: png_create_info_struct (end_info)\n" );
return;
}
// configure the read function
png_set_read_fn( png_ptr, ( voidp ) & p_fbuffer, ( png_rw_ptr ) & user_read_data );
if ( setjmp( png_ptr->jmpbuf ) ) {
png_destroy_read_struct( &png_ptr, &info_ptr,
&end_info );
if ( *pic ) {
g_free( *pic );
free( row_pointers );
}
return;
}
png_read_info( png_ptr, info_ptr );
int bit_depth = png_get_bit_depth( png_ptr, info_ptr );
int color_type = png_get_color_type( png_ptr, info_ptr );
// we want to treat all images the same way
// The following code transforms grayscale images of less than 8 to 8 bits,
// changes paletted images to RGB, and adds a full alpha channel if there is
// transparency information in a tRNS chunk.
if ( color_type == PNG_COLOR_TYPE_PALETTE ) {
png_set_palette_to_rgb( png_ptr );
}
if ( color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8 ) {
png_set_expand_gray_1_2_4_to_8( png_ptr );
}
if ( png_get_valid( png_ptr, info_ptr, PNG_INFO_tRNS ) ) {
png_set_tRNS_to_alpha( png_ptr );
}
if ( !( color_type & PNG_COLOR_MASK_ALPHA ) ) {
// Set the background color to draw transparent and alpha images over.
png_color_16 my_background, *image_background;
if ( png_get_bKGD( png_ptr, info_ptr, &image_background ) ) {
png_set_background( png_ptr, image_background,
PNG_BACKGROUND_GAMMA_FILE, 1, 1.0 );
}
else{
png_set_background( png_ptr, &my_background,
PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0 );
}
// Add alpha byte after each RGB triplet
png_set_filler( png_ptr, 0xff, PNG_FILLER_AFTER );
}
// read the sucker in one chunk
png_read_update_info( png_ptr, info_ptr );
color_type = png_get_color_type( png_ptr, info_ptr );
bit_depth = png_get_bit_depth( png_ptr, info_ptr );
*width = png_get_image_width( png_ptr, info_ptr );
*height = png_get_image_height( png_ptr, info_ptr );
// allocate the pixel buffer, and the row pointers
int size = ( *width ) * ( *height ) * 4;
// still have to use that g_malloc heresy
*pic = (unsigned char *)g_malloc( size );
row_pointers = (png_byte**) malloc( ( *height ) * sizeof( png_byte* ) );
int i;
for ( i = 0; i < ( *height ); i++ )
row_pointers[i] = (png_byte*)( *pic ) + i * 4 * ( *width );
// actual read
png_read_image( png_ptr, row_pointers );
/* read rest of file, and get additional chunks in info_ptr - REQUIRED */
png_read_end( png_ptr, info_ptr );
/* free up the memory structure */
png_destroy_read_struct( &png_ptr, &info_ptr, NULL );
free( row_pointers );
g_FileSystemTable.m_pfnFreeFile( fbuffer );
}