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|
/*
/--------------------------------------------------------------------
|
| $Id: plpngdec.cpp,v 1.13 2004/10/02 22:23:12 uzadow Exp $
| PNG Decoder Class
|
| PNG file decoder. Uses LibPng to do the actual decoding.
| PNG supports many pixel formats not supported by paintlib.
| These pixel formats are converted to the nearest paintlib
| equivalent. Images with less or more than 8 bits per channel
| are converted to 8 bits per channel. Images with 16-bit
| palettes or grayscale images with an alpha channel are
| returned as full 32-bit RGBA bitmaps.
|
| Copyright (c) 1996-2002 Ulrich von Zadow
|
\--------------------------------------------------------------------
*/
#include "plpngdec.h"
#include "plexcept.h"
#include "png.h"
PLPNGDecoder::PLPNGDecoder
()
: PLPicDecoder()
// Creates a decoder
{
}
PLPNGDecoder::~PLPNGDecoder
()
{
}
void my_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
// todo : check data erasing
PLBYTE *ptr;
PLDataSource* pSourceInfo=(PLDataSource*)png_get_io_ptr(png_ptr);
ptr = pSourceInfo->ReadNBytes(length);
memcpy(data,ptr,length);
}
void PLPNGDecoder::Open (PLDataSource * pDataSrc)
{
png_uint_32 width, height;
int interlace_type;
m_png_ptr = png_create_read_struct
(PNG_LIBPNG_VER_STRING,
(void *)NULL,
user_error_fn,
user_warning_fn);
PLASSERT (m_png_ptr);
m_info_ptr = png_create_info_struct(m_png_ptr);
PLASSERT (m_info_ptr);
png_set_read_fn(m_png_ptr, (void*)pDataSrc, my_read_data);
/* The call to png_read_info() gives us all of the information from the
* PNG file before the first IDAT (image data chunk).
*/
png_read_info(m_png_ptr, m_info_ptr);
png_get_IHDR(m_png_ptr, m_info_ptr, &width, &height, &m_bit_depth, &m_color_type,
&interlace_type, NULL, NULL);
PLPixelFormat pf;
switch (m_color_type)
{
case PNG_COLOR_TYPE_RGB:
pf = PLPixelFormat::R8G8B8;
break;
case PNG_COLOR_TYPE_RGB_ALPHA:
pf = PLPixelFormat::A8R8G8B8;
break;
case PNG_COLOR_TYPE_GRAY:
pf = PLPixelFormat::L8;
break;
case PNG_COLOR_TYPE_GRAY_ALPHA:
png_set_gray_to_rgb(m_png_ptr);
png_set_expand(m_png_ptr);
pf = PLPixelFormat::A8R8G8B8;
break;
case PNG_COLOR_TYPE_PALETTE:
if (m_bit_depth != 16)
pf = PLPixelFormat::I8;
else
{ // 16-bit palette image
png_set_expand(m_png_ptr);
pf = PLPixelFormat::R8G8B8;
}
break;
}
if (pf.GetBitsPerPixel() == 32 || pf.GetBitsPerPixel() == 24)
{
png_set_bgr (m_png_ptr);
}
SetBmpInfo (PLPoint (width, height), PLPoint(0,0), pf);
PLULONG XRes, YRes;
int UnitType;
png_get_pHYs (m_png_ptr, m_info_ptr, &XRes, &YRes,
&UnitType);
if (UnitType == PNG_RESOLUTION_METER)
m_Resolution = PLPoint (int (XRes/39.37f+0.5), int (YRes/39.37f+0.5));
}
void PLPNGDecoder::GetImage (PLBmpBase & Bmp)
{
if (m_color_type == PNG_COLOR_TYPE_GRAY)
{
int i;
int NumColors = 1<<(m_bit_depth);
for (i=0; i<NumColors; i++)
{
int CurColor = (i*255)/(NumColors-1);
Bmp.SetPaletteEntry(i, CurColor, CurColor, CurColor, 0xFF);
}
}
if (m_color_type == PNG_COLOR_TYPE_PALETTE)
{
png_color* ppng_color_tab=NULL;
int i;
int nbColor=0;
png_get_PLTE(m_png_ptr, m_info_ptr, &ppng_color_tab, &nbColor);
for (i=0; i<nbColor; i++)
{
Bmp.SetPaletteEntry(i,
(*(ppng_color_tab+i)).red,
(*(ppng_color_tab+i)).green,
(*(ppng_color_tab+i)).blue,
0xFF);
}
}
if (m_bit_depth == 16)
png_set_strip_16(m_png_ptr);
if (m_bit_depth < 8)
png_set_packing(m_png_ptr);
PLBYTE ** pLineArray = Bmp.GetLineArray();
png_read_image(m_png_ptr, pLineArray);
/* read rest of file, and get additional chunks in info_ptr - REQUIRED */
png_read_end(m_png_ptr, m_info_ptr);
/* clean up after the read, and free any memory allocated - REQUIRED */
png_destroy_read_struct(&m_png_ptr, &m_info_ptr, (png_infopp)NULL);
}
void PLPNGDecoder::user_error_fn
( png_structp png_ptr,
png_const_charp error_msg
)
{
raiseError (PL_ERRFORMAT_UNKNOWN, (char *)error_msg);
}
void PLPNGDecoder::user_warning_fn
( png_structp png_ptr,
png_const_charp warning_msg
)
{
PLTRACE ((char *)warning_msg);
}
/*
/--------------------------------------------------------------------
|
| $Log: plpngdec.cpp,v $
| Revision 1.13 2004/10/02 22:23:12 uzadow
| - configure and Makefile cleanups\n- Pixelformat enhancements for several filters\n- Added PLBmpBase:Dump\n- Added PLBmpBase::GetPixelNn()-methods\n- Changed default unix byte order to BGR
|
| Revision 1.12 2004/09/11 12:41:35 uzadow
| removed plstdpch.h
|
| Revision 1.11 2004/09/09 16:52:49 artcom
| refactored PixelFormat
|
| Revision 1.10 2004/07/28 11:41:07 uzadow
| PNG decoder now decodes directly to 24 bpp
|
| Revision 1.9 2004/06/19 16:49:07 uzadow
| Changed GetImage so it works with PLBmpBase
|
| Revision 1.8 2002/08/04 20:08:01 uzadow
| Added PLBmpInfo class, ability to extract metainformation from images without loading the whole image and proper greyscale support.
|
| Revision 1.7 2002/03/31 13:36:42 uzadow
| Updated copyright.
|
| Revision 1.6 2001/10/21 17:12:40 uzadow
| Added PSD decoder beta, removed BPPWanted from all decoders, added PLFilterPixel.
|
| Revision 1.5 2001/10/16 18:00:19 uzadow
| Linux compatibility
|
| Revision 1.4 2001/10/16 17:12:26 uzadow
| Added support for resolution information (Luca Piergentili)
|
| Revision 1.3 2001/10/06 22:37:08 uzadow
| Linux compatibility.
|
| Revision 1.2 2001/09/28 19:50:56 uzadow
| Added some 24 bpp stuff & other minor features.
|
| Revision 1.1 2001/09/16 19:03:22 uzadow
| Added global name prefix PL, changed most filenames.
|
| Revision 1.11 2001/02/04 14:31:52 uzadow
| Member initialization list cleanup (Erik Hoffmann).
|
| Revision 1.10 2000/12/18 22:42:52 uzadow
| Replaced RGBAPIXEL with PLPixel32.
|
| Revision 1.9 2000/08/13 12:11:43 Administrator
| Added experimental DirectDraw-Support
|
| Revision 1.8 2000/07/11 17:11:01 Ulrich von Zadow
| Added support for RGBA pixel ordering (Jose Miguel Buenaposada Biencinto).
|
| Revision 1.7 2000/01/16 20:43:14 anonymous
| Removed MFC dependencies
|
| Revision 1.6 2000/01/04 18:35:23 Ulrich von Zadow
| no message
|
| Revision 1.5 1999/12/08 16:31:40 Ulrich von Zadow
| Unix compatibility
|
| Revision 1.4 1999/12/08 15:39:45 Ulrich von Zadow
| Unix compatibility changes
|
| Revision 1.3 1999/10/03 18:50:51 Ulrich von Zadow
| Added automatic logging of changes.
|
|
--------------------------------------------------------------------
*/
|
