--- /dev/null
+/* === S Y N F I G ========================================================= */
+/*! \file mptr_png.cpp
+** \brief ppm Target Module
+**
+** $Id$
+**
+** \legal
+** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
+** Copyright (c) 2007 Chris Moore
+**
+** This package 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 package 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.
+** \endlegal
+**
+** === N O T E S ===========================================================
+**
+** ========================================================================= */
+
+/*!
+** \todo Support 16 bit PNG files
+** \todo Support GAMMA correction
+** \todo Fix memory leaks
+*/
+
+/* === H E A D E R S ======================================================= */
+
+#ifdef USING_PCH
+# include "pch.h"
+#else
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "mptr_png.h"
+#include <synfig/importer.h>
+#include <synfig/time.h>
+#include <synfig/general.h>
+
+
+#include <cstdio>
+#include <algorithm>
+#include <functional>
+#endif
+
+/* === M A C R O S ========================================================= */
+
+using namespace synfig;
+using namespace std;
+using namespace etl;
+
+#define PNG_CHECK_BYTES 8
+
+/* === G L O B A L S ======================================================= */
+
+SYNFIG_IMPORTER_INIT(png_mptr);
+SYNFIG_IMPORTER_SET_NAME(png_mptr,"png");
+SYNFIG_IMPORTER_SET_EXT(png_mptr,"png");
+SYNFIG_IMPORTER_SET_VERSION(png_mptr,"0.1");
+SYNFIG_IMPORTER_SET_CVS_ID(png_mptr,"$Id$");
+
+/* === M E T H O D S ======================================================= */
+
+void
+png_mptr::png_out_error(png_struct */*png_data*/,const char *msg)
+{
+ //png_mptr *me=(png_mptr*)png_data->error_ptr;
+ synfig::error(strprintf("png_mptr: error: %s",msg));
+ //me->ready=false;
+}
+
+void
+png_mptr::png_out_warning(png_struct */*png_data*/,const char *msg)
+{
+ //png_mptr *me=(png_mptr*)png_data->error_ptr;
+ synfig::warning(strprintf("png_mptr: warning: %s",msg));
+ //me->ready=false;
+}
+
+int
+png_mptr::read_chunk_callback(png_struct */*png_data*/, png_unknown_chunkp /*chunk*/)
+{
+ /* The unknown chunk structure contains your
+ chunk data: */
+ //png_byte name[5];
+ //png_byte *data;
+ //png_size_t size;
+ /* Note that libpng has already taken care of
+ the CRC handling */
+
+ /* put your code here. Return one of the
+ following: */
+
+ //return (-n); /* chunk had an error */
+ return (0); /* did not recognize */
+ //return (n); /* success */
+}
+
+png_mptr::png_mptr(const char *file_name)
+{
+ filename=file_name;
+
+ /* Open the file pointer */
+ FILE *file = fopen(file_name, "rb");
+ if (!file)
+ {
+ //! \todo THROW SOMETHING
+ throw strprintf("Unable to physically open %s",file_name);
+ return;
+ }
+
+
+ /* Make sure we are dealing with a PNG format file */
+ png_byte header[PNG_CHECK_BYTES];
+ fread(header, 1, PNG_CHECK_BYTES, file);
+ bool is_png = !png_sig_cmp(header, 0, PNG_CHECK_BYTES);
+ if (!is_png)
+ {
+ //! \todo THROW SOMETHING
+ throw strprintf("This (\"%s\") doesn't appear to be a PNG file",file_name);
+ return;
+ }
+
+
+ png_structp png_ptr = png_create_read_struct
+ (PNG_LIBPNG_VER_STRING, (png_voidp)this,
+ &png_mptr::png_out_error, &png_mptr::png_out_warning);
+ if (!png_ptr)
+ {
+ //! \todo THROW SOMETHING
+ throw String("error on importer construction, *WRITEME*3");
+ return;
+ }
+
+ png_infop info_ptr = png_create_info_struct(png_ptr);
+ if (!info_ptr)
+ {
+ png_destroy_read_struct(&png_ptr,
+ (png_infopp)NULL, (png_infopp)NULL);
+ //! \todo THROW SOMETHING
+ throw String("error on importer construction, *WRITEME*4");
+ return;
+ }
+
+ png_infop end_info = png_create_info_struct(png_ptr);
+ if (!end_info)
+ {
+ png_destroy_read_struct(&png_ptr, &info_ptr,
+ (png_infopp)NULL);
+ //! \todo THROW SOMETHING
+ throw String("error on importer construction, *WRITEME*4");
+ return;
+ }
+
+
+
+ png_init_io(png_ptr, file);
+ png_set_sig_bytes(png_ptr,PNG_CHECK_BYTES);
+
+ png_read_info(png_ptr, info_ptr);
+
+ int bit_depth,color_type,interlace_type, compression_type,filter_method;
+ png_uint_32 width,height;
+
+ png_get_IHDR(png_ptr, info_ptr, &width, &height,
+ &bit_depth, &color_type, &interlace_type,
+ &compression_type, &filter_method);
+
+ if (bit_depth == 16)
+ png_set_strip_16(png_ptr);
+
+ if (bit_depth < 8)
+ png_set_packing(png_ptr);
+
+ double fgamma;
+ if (png_get_gAMA(png_ptr, info_ptr, &fgamma))
+ {
+ synfig::info("PNG: Image gamma is %f",fgamma);
+ png_set_gamma(png_ptr, gamma().get_gamma(), fgamma);
+ }
+
+
+ /*
+ if (setjmp(png_jmpbuf(png_ptr)))
+ {
+ synfig::error("Unable to setup longjump");
+ png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
+ fclose(file);
+ //! \todo THROW SOMETHING
+ throw String("error on importer construction, *WRITEME*5");
+ return;
+ }
+ */
+
+ png_set_read_user_chunk_fn(png_ptr, this, &png_mptr::read_chunk_callback);
+
+ // man libpng tells me:
+ // You must use png_transforms and not call any
+ // png_set_transform() functions when you use png_read_png().
+ // but we used png_set_gamma(), which may be why we were seeing a crash at the end
+ // png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_PACKING|PNG_TRANSFORM_STRIP_16, NULL);
+
+ png_read_update_info(png_ptr, info_ptr);
+ png_uint_32 rowbytes = png_get_rowbytes(png_ptr, info_ptr);
+
+ // allocate buffer to read image data into
+ png_bytep *row_pointers=new png_bytep[height];
+ png_byte *data = new png_byte[rowbytes*height];
+ for (png_uint_32 i = 0; i < height; i++)
+ row_pointers[i] = &(data[rowbytes*i]);
+
+ png_read_image(png_ptr, row_pointers);
+
+ png_uint_32 x, y;
+ surface_buffer.set_wh(width,height);
+
+ switch(color_type)
+ {
+ case PNG_COLOR_TYPE_RGB:
+ for(y=0;y<height;y++)
+ for(x=0;x<width;x++)
+ {
+ float r=gamma().r_U8_to_F32((unsigned char)row_pointers[y][x*3+0]);
+ float g=gamma().g_U8_to_F32((unsigned char)row_pointers[y][x*3+1]);
+ float b=gamma().b_U8_to_F32((unsigned char)row_pointers[y][x*3+2]);
+ surface_buffer[y][x]=Color(
+ r,
+ g,
+ b,
+ 1.0
+ );
+/*
+ surface_buffer[y][x]=Color(
+ (float)(unsigned char)row_pointers[y][x*3+0]*(1.0/255.0),
+ (float)(unsigned char)row_pointers[y][x*3+1]*(1.0/255.0),
+ (float)(unsigned char)row_pointers[y][x*3+2]*(1.0/255.0),
+ 1.0
+ );
+*/
+ }
+ break;
+
+ case PNG_COLOR_TYPE_RGB_ALPHA:
+ for(y=0;y<height;y++)
+ for(x=0;x<width;x++)
+ {
+ float r=gamma().r_U8_to_F32((unsigned char)row_pointers[y][x*4+0]);
+ float g=gamma().g_U8_to_F32((unsigned char)row_pointers[y][x*4+1]);
+ float b=gamma().b_U8_to_F32((unsigned char)row_pointers[y][x*4+2]);
+ surface_buffer[y][x]=Color(
+ r,
+ g,
+ b,
+ (float)(unsigned char)row_pointers[y][x*4+3]*(1.0/255.0)
+ );
+ /*
+ surface_buffer[y][x]=Color(
+ (float)(unsigned char)row_pointers[y][x*4+0]*(1.0/255.0),
+ (float)(unsigned char)row_pointers[y][x*4+1]*(1.0/255.0),
+ (float)(unsigned char)row_pointers[y][x*4+2]*(1.0/255.0),
+ (float)(unsigned char)row_pointers[y][x*4+3]*(1.0/255.0)
+ );
+ */
+ }
+ break;
+
+ case PNG_COLOR_TYPE_GRAY:
+ for(y=0;y<height;y++)
+ for(x=0;x<width;x++)
+ {
+ float gray=gamma().g_U8_to_F32((unsigned char)row_pointers[y][x]);
+ //float gray=(float)(unsigned char)row_pointers[y][x]*(1.0/255.0);
+ surface_buffer[y][x]=Color(
+ gray,
+ gray,
+ gray,
+ 1.0
+ );
+ }
+ break;
+
+ case PNG_COLOR_TYPE_GRAY_ALPHA:
+ for(y=0;y<height;y++)
+ for(x=0;x<width;x++)
+ {
+ float gray=gamma().g_U8_to_F32((unsigned char)row_pointers[y][x*2]);
+// float gray=(float)(unsigned char)row_pointers[y][x*2]*(1.0/255.0);
+ surface_buffer[y][x]=Color(
+ gray,
+ gray,
+ gray,
+ (float)(unsigned char)row_pointers[y][x*2+1]*(1.0/255.0)
+ );
+ }
+ break;
+
+ case PNG_COLOR_TYPE_PALETTE:
+ for(y=0;y<height;y++)
+ for(x=0;x<width;x++)
+ {
+ float r=gamma().r_U8_to_F32((unsigned char)png_ptr->palette[row_pointers[y][x]].red);
+ float g=gamma().g_U8_to_F32((unsigned char)png_ptr->palette[row_pointers[y][x]].green);
+ float b=gamma().b_U8_to_F32((unsigned char)png_ptr->palette[row_pointers[y][x]].blue);
+ float a=1.0;
+ if(info_ptr->valid & PNG_INFO_tRNS)
+ a = (float)(unsigned char)png_ptr->trans[row_pointers[y][x]]*(1.0/255.0);
+ surface_buffer[y][x]=Color(
+ r,
+ g,
+ b,
+ a
+ );
+ }
+ break;
+ default:
+ synfig::error("png_mptr: error: Unsupported color type");
+ //! \todo THROW SOMETHING
+ throw String("error on importer construction, *WRITEME*6");
+ return;
+ }
+
+ png_read_end(png_ptr, end_info);
+ png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
+ fclose(file);
+
+ delete [] row_pointers;
+ delete [] data;
+
+ trim = false;
+
+ if (getenv("SYNFIG_DISABLE_CROP_IMPORTED_IMAGES"))
+ return;
+
+ switch(color_type)
+ {
+ case PNG_COLOR_TYPE_RGB_ALPHA:
+ case PNG_COLOR_TYPE_GRAY_ALPHA:
+ case PNG_COLOR_TYPE_PALETTE:
+ for(y=0;y<height;y++)
+ {
+ for(x=0;x<width;x++)
+ if (surface_buffer[y][x].get_a()) break;
+ if (x != width) break;
+ }
+
+ if (y != height)
+ {
+#define BORDER 1 // don't chop off all the transparent space - leave a border this many pixels wide for the interpolation
+
+ png_uint_32 min_x, min_y, max_x, max_y;
+ if (y>BORDER) min_y = y-BORDER; else min_y = 0;
+
+ for(y=height-1;y>0;y--)
+ {
+ for(x=0;x<width;x++)
+ if (surface_buffer[y][x].get_a()) break;
+ if (x != width) break;
+ }
+ max_y = std::min(y+BORDER,height-1);
+
+ for(x=0;x<width;x++)
+ {
+ for(y=0;y<height;y++)
+ if (surface_buffer[y][x].get_a()) break;
+ if (y != height) break;
+ }
+ if (x>BORDER) min_x = x-BORDER; else min_x = 0;
+
+ for(x=width-1;x>0;x--)
+ {
+ for(y=0;y<height;y++)
+ if (surface_buffer[y][x].get_a()) break;
+ if (y != height) break;
+ }
+ max_x = std::min(x+BORDER,width-1);
+
+ if (min_x != 0 || max_x != width-1 ||
+ min_y != 0 || max_y != height-1)
+ {
+ trim = true;
+ orig_width = width;
+ orig_height = height;
+ trimmed_x = min_x;
+ trimmed_y = min_y;
+
+ width=max_x-min_x+1;
+ height=max_y-min_y+1;
+ synfig::Surface tmp_buffer;
+ tmp_buffer.set_wh(width,height);
+ for(y=0;y<height;y++)
+ for(x=0;x<width;x++)
+ tmp_buffer[y][x] = surface_buffer[y+min_y][x+min_x];
+ surface_buffer = tmp_buffer;
+ }
+ }
+ }
+}
+
+png_mptr::~png_mptr()
+{
+}
+
+bool
+png_mptr::get_frame(synfig::Surface &surface,Time, synfig::ProgressCallback */*cb*/)
+{
+ //assert(0); // shouldn't be called?
+ surface=surface_buffer;
+ return true;
+}
+
+bool
+png_mptr::get_frame(synfig::Surface &surface,Time,
+ bool &trimmed, unsigned int &width, unsigned int &height, unsigned int &top, unsigned int &left,
+ synfig::ProgressCallback */*cb*/)
+{
+ surface=surface_buffer;
+ if ((trimmed = trim))
+ {
+ width = orig_width;
+ height = orig_height;
+ top = trimmed_y;
+ left = trimmed_x;
+ }
+ return true;
+}
projects / synfig.git / blobdiff