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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
/*
* This code is based on Broken Sword 2.5 engine
*
* Copyright (c) Malte Thiesen, Daniel Queteschiner and Michael Elsdoerfer
*
* Licensed under GNU GPL v2
*
*/
// -----------------------------------------------------------------------------
// Includes
// -----------------------------------------------------------------------------
#include "sword25/gfx/image/image.h"
#include "sword25/gfx/image/pngloader.h"
#include <png.h>
namespace Sword25 {
#define BS_LOG_PREFIX "PNGLOADER"
// -----------------------------------------------------------------------------
// Konstruktor / Destruktor
// -----------------------------------------------------------------------------
PNGLoader::PNGLoader() {
}
// -----------------------------------------------------------------------------
// Laden
// -----------------------------------------------------------------------------
static void png_user_read_data(png_structp png_ptr, png_bytep data, png_size_t length) {
const byte **ref = (const byte **)png_get_io_ptr(png_ptr);
memcpy(data, *ref, length);
*ref += length;
}
// -----------------------------------------------------------------------------
bool PNGLoader::DoDecodeImage(const byte *FileDataPtr, uint FileSize, GraphicEngine::COLOR_FORMATS ColorFormat, byte *&UncompressedDataPtr,
int &Width, int &Height, int &Pitch) {
png_structp png_ptr = NULL;
png_infop info_ptr = NULL;
png_bytep RawDataBuffer = NULL;
png_bytep *pRowPtr = NULL;
int BitDepth;
int ColorType;
int InterlaceType;
int i;
// Zielfarbformat �berpr�fen
if (ColorFormat != GraphicEngine::CF_ARGB32) {
BS_LOG_ERRORLN("Illegal or unsupported color format.");
return false;
}
// PNG Signatur �berpr�fen
if (!png_check_sig(reinterpret_cast<png_bytep>(const_cast<byte *>(FileDataPtr)), 8)) {
error("png_check_sig failed");
}
// Die beiden PNG Strukturen erstellen
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr) {
error("Could not create libpng read struct.");
}
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
error("Could not create libpng info struct.");
}
// Alternative Lesefunktion benutzen
const byte **ref = &FileDataPtr;
png_set_read_fn(png_ptr, (void *)ref, png_user_read_data);
// PNG Header einlesen
png_read_info(png_ptr, info_ptr);
// PNG Informationen auslesen
png_get_IHDR(png_ptr, info_ptr, (png_uint_32 *)&Width, (png_uint_32 *)&Height, &BitDepth, &ColorType, &InterlaceType, NULL, NULL);
// Pitch des Ausgabebildes berechnen
Pitch = GraphicEngine::CalcPitch(ColorFormat, Width);
// Speicher f�r die endg�ltigen Bilddaten reservieren
// Dieses geschieht vor dem reservieren von Speicher f�r tempor�re Bilddaten um die Fragmentierung des Speichers gering zu halten
UncompressedDataPtr = new byte[Pitch * Height];
if (!UncompressedDataPtr) {
error("Could not allocate memory for output image.");
}
// Bilder jeglicher Farbformate werden zun�chst in ARGB Bilder umgewandelt
if (BitDepth == 16)
png_set_strip_16(png_ptr);
if (ColorType == PNG_COLOR_TYPE_PALETTE)
png_set_expand(png_ptr);
if (BitDepth < 8)
png_set_expand(png_ptr);
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
png_set_expand(png_ptr);
if (ColorType == PNG_COLOR_TYPE_GRAY ||
ColorType == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png_ptr);
png_set_bgr(png_ptr);
if (ColorType != PNG_COLOR_TYPE_RGB_ALPHA)
png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
// Nachdem die Transformationen registriert wurden, werden die Bilddaten erneut eingelesen
png_read_update_info(png_ptr, info_ptr);
png_get_IHDR(png_ptr, info_ptr, (png_uint_32 *)&Width, (png_uint_32 *)&Height, &BitDepth, &ColorType, NULL, NULL, NULL);
// PNGs ohne Interlacing werden Zeilenweise eingelesen
if (InterlaceType == PNG_INTERLACE_NONE) {
// Speicher f�r eine Bildzeile reservieren
RawDataBuffer = new png_byte[png_get_rowbytes(png_ptr, info_ptr)];
if (!RawDataBuffer) {
error("Could not allocate memory for row buffer.");
}
// Bilddaten zeilenweise einlesen und in das gew�nschte Zielformat konvertieren
for (i = 0; i < Height; i++) {
// Zeile einlesen
png_read_row(png_ptr, RawDataBuffer, NULL);
// Zeile konvertieren
switch (ColorFormat) {
case GraphicEngine::CF_ARGB32:
memcpy(&UncompressedDataPtr[i * Pitch], RawDataBuffer, Pitch);
break;
default:
assert(0);
}
}
} else {
// PNGs mit Interlacing werden an einem St�ck eingelesen
// Speicher f�r das komplette Bild reservieren
RawDataBuffer = new png_byte[png_get_rowbytes(png_ptr, info_ptr) * Height];
if (!RawDataBuffer) {
error("Could not allocate memory for raw image buffer.");
}
// Speicher f�r die Rowpointer reservieren
pRowPtr = new png_bytep[Height];
if (!pRowPtr) {
error("Could not allocate memory for row pointers.");
}
// Alle Rowpointer mit den richtigen Offsets initialisieren
for (i = 0; i < Height; i++)
pRowPtr[i] = RawDataBuffer + i * png_get_rowbytes(png_ptr, info_ptr);
// Bild einlesen
png_read_image(png_ptr, pRowPtr);
// Bilddaten zeilenweise in das gew�nschte Ausgabeformat konvertieren
switch (ColorFormat) {
case GraphicEngine::CF_ARGB32:
for (i = 0; i < Height; i++)
memcpy(&UncompressedDataPtr[i * Pitch], &RawDataBuffer[i * png_get_rowbytes(png_ptr, info_ptr)], Pitch);
break;
default:
error("Unhandled case in DoDecodeImage");
break;
}
}
// Die zus�tzlichen Daten am Ende des Bildes lesen
png_read_end(png_ptr, NULL);
// Die Strukturen freigeben
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
// Tempor�re Buffer freigeben
delete[] pRowPtr;
delete[] RawDataBuffer;
// Der Funktionsaufruf war erfolgreich
return true;
}
// -----------------------------------------------------------------------------
bool PNGLoader::DecodeImage(const byte *FileDataPtr, uint FileSize, GraphicEngine::COLOR_FORMATS ColorFormat, byte *&UncompressedDataPtr,
int &Width, int &Height, int &Pitch) {
return DoDecodeImage(FileDataPtr, FileSize, ColorFormat, UncompressedDataPtr, Width, Height, Pitch);
}
// -----------------------------------------------------------------------------
bool PNGLoader::DoImageProperties(const byte *FileDataPtr, uint FileSize, GraphicEngine::COLOR_FORMATS &ColorFormat, int &Width, int &Height) {
// PNG Signatur �berpr�fen
if (!DoIsCorrectImageFormat(FileDataPtr, FileSize)) return false;
png_structp png_ptr = NULL;
png_infop info_ptr = NULL;
// Die beiden PNG Strukturen erstellen
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr) {
error("Could not create libpng read struct.");
}
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
error("Could not create libpng info struct.");
}
// Alternative Lesefunktion benutzen
const byte **ref = &FileDataPtr;
png_set_read_fn(png_ptr, (void *)ref, png_user_read_data);
// PNG Header einlesen
png_read_info(png_ptr, info_ptr);
// PNG Informationen auslesen
int BitDepth;
int ColorType;
png_get_IHDR(png_ptr, info_ptr, (png_uint_32 *)&Width, (png_uint_32 *)&Height, &BitDepth, &ColorType, NULL, NULL, NULL);
// PNG-ColorType in BS ColorFormat konvertieren.
if (ColorType & PNG_COLOR_MASK_ALPHA || png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
ColorFormat = GraphicEngine::CF_ARGB32;
else
ColorFormat = GraphicEngine::CF_RGB24;
// Die Strukturen freigeben
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return true;
}
// -----------------------------------------------------------------------------
bool PNGLoader::ImageProperties(const byte *FileDataPtr, uint FileSize, GraphicEngine::COLOR_FORMATS &ColorFormat, int &Width, int &Height) {
return DoImageProperties(FileDataPtr, FileSize, ColorFormat, Width, Height);
}
// -----------------------------------------------------------------------------
// Header �berpr�fen
// -----------------------------------------------------------------------------
bool PNGLoader::DoIsCorrectImageFormat(const byte *FileDataPtr, uint FileSize) {
if (FileSize > 8)
return png_check_sig(const_cast<byte *>(FileDataPtr), 8) ? true : false;
else
return false;
}
// -----------------------------------------------------------------------------
bool PNGLoader::IsCorrectImageFormat(const byte *FileDataPtr, uint FileSize) {
return DoIsCorrectImageFormat(FileDataPtr, FileSize);
}
} // End of namespace Sword25
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