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/** \file backgnd.c
* Layout background image
*/
/* XTrkCad - Model Railroad CAD
* Copyright (C) 2018 Martin Fischer
*
* 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 <windows.h>
#include <FreeImage.h>
#include "i18n.h"
#include "mswint.h"
static char *lastErrorMessage; /**< store last message from FreeImage */
#define ERRORPUNCTUATION " : "
/**
* FreeImage error handler
* \param fif Format / Plugin responsible for the error
* \param message Error message
*/
static void
HandleFreeImageError( FREE_IMAGE_FORMAT fif, const char *message )
{
size_t totalLength = strlen( message ) + 1;
if( fif != FIF_UNKNOWN ) {
totalLength += strlen( FreeImage_GetFormatFromFIF( fif ) ) + strlen(
ERRORPUNCTUATION );
}
lastErrorMessage = malloc( totalLength );
if( fif != FIF_UNKNOWN ) {
sprintf( lastErrorMessage,
"%s" ERRORPUNCTUATION "%s",
FreeImage_GetFormatFromFIF( fif ),
message );
} else {
strcpy( lastErrorMessage, message );
}
}
/**
* Load the background image
* \param bd drawing context
* \param path filename for image file, if NULL the existing background will be removed
* \param error returned error message
* \return -1 unsupported or invalid file, 0 success, 1 background removed
*/
int
wDrawSetBackground( wDraw_p bd, char * path, char ** error )
{
FREE_IMAGE_FORMAT fif = FIF_UNKNOWN;
FreeImage_SetOutputMessage( HandleFreeImageError );
if( lastErrorMessage ) {
free( lastErrorMessage );
lastErrorMessage = NULL;
}
if( path ) {
// check the file signature and deduce its format
// (the second argument is currently not used by FreeImage)
fif = FreeImage_GetFileType( path, 0 );
if( fif == FIF_UNKNOWN ) {
// no signature ?
// try to guess the file format from the file extension
fif = FreeImage_GetFIFFromFilename( path );
}
// check that the plugin has reading capabilities ...
if( ( fif != FIF_UNKNOWN ) && FreeImage_FIFSupportsReading( fif ) ) {
// ok, let's load the file
bd->background = FreeImage_Load( fif, path, 0 );
// unless a bad file format, we are done !
if( !bd->background ) {
*error = lastErrorMessage;
return ( -1 );
} else {
return ( 0 );
}
} else {
*error = _strdup( _( "Image file is invalid or cannot be read." ) );
return ( -1 );
}
} else {
if( bd->background ) {
FreeImage_Unload( bd->background );
bd->background = 0;
}
return ( 1 );
}
}
/**
* Use a loaded background in another context.
*
* \param from context with background
* \param to context to get a reference to the existing background
*/
void
wDrawCloneBackground( wDraw_p from, wDraw_p to )
{
if( from->background ) {
to->background = from->background;
} else {
to->background = NULL;
}
}
/**
* Draw background to screen. The background will be sized and rotated before being shown. The bitmap
* is scaled so that the width is equal to size. The height is changed proportionally.
*
* \param bd drawing context
* \param pos_x, pos_y bitmap position
* \param size desired width after scaling
* \param angle
* \param screen visibility of bitmap in percent
*/
void
wDrawShowBackground( wDraw_p bd, wWinPix_t pos_x, wWinPix_t pos_y,
wWinPix_t size,
wAngle_t angle, int screen )
{
if( bd->background ) {
double scale;
FIBITMAP *tmp;
FIBITMAP *rotated;
if( size == 0 ) {
scale = 1.0;
} else {
scale = ( double )size / FreeImage_GetWidth( bd->background );
}
tmp = FreeImage_RescaleRect( bd->background,
( int )( ( double )FreeImage_GetWidth( bd->background ) * scale ),
( int )( ( double )FreeImage_GetHeight( bd->background ) * scale ),
0,
0,
FreeImage_GetWidth( bd->background ),
FreeImage_GetHeight( bd->background ),
FILTER_BILINEAR,
0 );
if( tmp == NULL ) {
return;
}
FreeImage_AdjustColors( tmp, screen, -screen, 1.0, FALSE );
FREE_IMAGE_TYPE image_type = FreeImage_GetImageType( tmp );
switch( image_type ) {
case FIT_BITMAP:
switch( FreeImage_GetBPP( tmp ) ) {
case 8: {
BYTE color = 255;
rotated = FreeImage_Rotate( tmp, angle, &color );
}
break;
case 24: // we could also use 'RGBTRIPLE color' here
case 32: {
RGBQUAD color = { 255, 255, 255, 0 };
// for 24-bit images, the first 3 bytes will be read
// for 32-bit images, the first 4 bytes will be read
rotated = FreeImage_Rotate( tmp, angle, &color );
}
break;
}
break;
case FIT_UINT16: {
WORD color = 255;
rotated = FreeImage_Rotate( tmp, angle, &color );
}
break;
case FIT_RGB16: // we could also use 'FIRGB16 color' here
case FIT_RGBA16: {
FIRGBA16 color = { 255, 255, 255, 0 };
// for RGB16 images, the first 3 WORD will be read
// for RGBA16 images, the first 4 WORD will be read
rotated = FreeImage_Rotate( tmp, angle, &color );
}
break;
case FIT_FLOAT: {
float color = 1.0F;
rotated = FreeImage_Rotate( tmp, angle, &color );
}
break;
case FIT_RGBF: // we could also use 'FIRGBF color' here
case FIT_RGBAF: {
FIRGBAF color = { 1, 1, 1, 0 };
// for RGBF images, the first 3 float will be read
// for RGBAF images, the first 4 float will be read
rotated = FreeImage_Rotate( tmp, angle, &color );
}
break;
}
SetDIBitsToDevice( bd->hDc,
pos_x,
bd->h - pos_y - FreeImage_GetHeight( rotated ),
FreeImage_GetWidth( rotated ),
FreeImage_GetHeight( rotated ),
0, 0,
0,
FreeImage_GetHeight( rotated ),
FreeImage_GetBits( rotated ),
FreeImage_GetInfo( rotated ),
DIB_RGB_COLORS );
FreeImage_Unload( tmp );
FreeImage_Unload( rotated );
}
}
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