diff options
Diffstat (limited to 'engines/sword25/gfx/image/pngloader.cpp')
| -rw-r--r-- | engines/sword25/gfx/image/pngloader.cpp | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/engines/sword25/gfx/image/pngloader.cpp b/engines/sword25/gfx/image/pngloader.cpp new file mode 100644 index 0000000000..c59d68724d --- /dev/null +++ b/engines/sword25/gfx/image/pngloader.cpp @@ -0,0 +1,283 @@ +/* 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) { + memcpy(data, (char *)png_ptr->io_ptr, length); + png_ptr->io_ptr = (void *)((png_size_t)png_ptr->io_ptr + 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 überprüfen + if (ColorFormat != GraphicEngine::CF_ARGB32) { + BS_LOG_ERRORLN("Illegal or unsupported color format."); + return false; + } + + // PNG Signatur überprüfen + 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 + png_set_read_fn(png_ptr, (void *)FileDataPtr, 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 für die endgültigen Bilddaten reservieren + // Dieses geschieht vor dem reservieren von Speicher für temporäre 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 zunächst 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 für 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 gewünschte 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 Stück eingelesen + // Speicher für 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 für 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 gewünschte 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 zusätzlichen Daten am Ende des Bildes lesen + png_read_end(png_ptr, NULL); + + // Die Strukturen freigeben + png_destroy_read_struct(&png_ptr, &info_ptr, NULL); + + // Temporäre 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 überprüfen + 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 + png_set_read_fn(png_ptr, (void *)FileDataPtr, 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 überprüfen +// ----------------------------------------------------------------------------- + +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 |