Initial check in for pnginfo, command line program for displaying info about PNG image files
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7271 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Matthew Wilber
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SubDir OBOS_TOP src tools translation pnginfo ;
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UseLibraryHeaders zlib ;
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UseLibraryHeaders png ;
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BinCommand pnginfo : pnginfo.cpp : be libpng.a libz.a ;
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@@ -0,0 +1,238 @@
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/*****************************************************************************/
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// pnginfo
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// Written by Michael Wilber, OBOS Translation Kit Team
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//
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// Version:
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//
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// pnginfo is a command line program for displaying text information about
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// PNG images.
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//
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// This application and all source files used in its construction, except
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// where noted, are licensed under the MIT License, and have been written
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// and are:
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//
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// Copyright (c) 2004 OpenBeOS Project
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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/*****************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <png.h>
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#include <ByteOrder.h>
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#include <File.h>
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#include <TranslatorFormats.h>
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#include <StorageDefs.h>
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/* The png_jmpbuf() macro, used in error handling, became available in
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* libpng version 1.0.6. If you want to be able to run your code with older
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* versions of libpng, you must define the macro yourself (but only if it
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* is not already defined by libpng!).
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*/
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#ifndef png_jmpbuf
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# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
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#endif
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//// libpng Callback functions!
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BPositionIO *
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get_pio(png_structp ppng)
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{
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BPositionIO *pio = NULL;
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pio = static_cast<BPositionIO *>(png_get_io_ptr(ppng));
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return pio;
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}
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void
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pngcb_read_data(png_structp ppng, png_bytep pdata, png_size_t length)
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{
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BPositionIO *pio = get_pio(ppng);
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pio->Read(pdata, static_cast<size_t>(length));
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}
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void
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pngcb_write_data(png_structp ppng, png_bytep pdata, png_size_t length)
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{
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BPositionIO *pio = get_pio(ppng);
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pio->Write(pdata, static_cast<size_t>(length));
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}
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void
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pngcb_flush_data(png_structp ppng)
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{
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// I don't think I really need to do anything here
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}
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//// End: libpng Callback functions
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void
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PrintPNGInfo(const char *path)
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{
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printf("\n\n--- %s ---\n", path);
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BFile *pfile;
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pfile = new BFile(path, B_READ_ONLY);
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if (!pfile || pfile->InitCheck() != B_OK) {
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printf("Error: unable to open the file\n");
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return;
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}
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BPositionIO *pio = static_cast<BPositionIO *>(pfile);
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const int32 kSigSize = 8;
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uint8 buf[kSigSize];
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if (pio->Read(buf, kSigSize) != kSigSize) {
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printf("Error: unable to read PNG signature\n");
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return;
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}
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if (!png_check_sig(buf, kSigSize)) {
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// if first 8 bytes of stream don't match PNG signature bail
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printf("File doesn't begin with PNG signature\n");
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return;
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}
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// use libpng to get info about the file
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png_structp ppng = NULL;
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png_infop pinfo = NULL;
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while (ppng == NULL) {
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// create PNG read pointer with default error handling routines
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ppng = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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if (!ppng)
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break;
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// alocate / init memory for image information
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pinfo = png_create_info_struct(ppng);
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if (!pinfo)
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break;
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// set error handling
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if (setjmp(png_jmpbuf(ppng)))
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// When an error occurs in libpng, it uses
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// the longjmp function to continue execution
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// from this point
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break;
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// set read callback function
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png_set_read_fn(ppng, static_cast<void *>(pio), pngcb_read_data);
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// Read in PNG image info
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png_set_sig_bytes(ppng, 8);
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png_read_info(ppng, pinfo);
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png_uint_32 width, height;
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int bit_depth, color_type, interlace_type, compression_type, filter_type;
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png_get_IHDR(ppng, pinfo, &width, &height, &bit_depth, &color_type,
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&interlace_type, &compression_type, &filter_type);
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printf(" width: %u\n", width);
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printf(" height: %u\n", height);
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printf(" row bytes: %u\n", pinfo->rowbytes);
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printf("bit depth (bits/channel): %d\n", bit_depth);
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printf(" channels: %d\n", pinfo->channels);
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printf("pixel depth (bits/pixel): %d\n", pinfo->pixel_depth);
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printf(" color type: ");
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const char *desc = NULL;
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switch (color_type) {
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case PNG_COLOR_TYPE_GRAY:
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desc = "Grayscale";
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break;
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case PNG_COLOR_TYPE_PALETTE:
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desc = "Palette";
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break;
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case PNG_COLOR_TYPE_RGB:
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desc = "RGB";
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break;
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case PNG_COLOR_TYPE_RGB_ALPHA:
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desc = "RGB + Alpha";
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break;
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case PNG_COLOR_TYPE_GRAY_ALPHA:
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desc = "Grayscale + Alpha";
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break;
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default:
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desc = "Unknown";
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break;
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}
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printf("%s (%d)\n", desc, color_type);
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printf(" interlacing: ");
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switch (interlace_type) {
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case PNG_INTERLACE_NONE:
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desc = "None";
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break;
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case PNG_INTERLACE_ADAM7:
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desc = "Adam7";
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break;
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default:
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desc = "Unknown";
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break;
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}
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printf("%s (%d)\n", desc, interlace_type);
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printf(" compression type: ");
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switch (compression_type) {
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case PNG_COMPRESSION_TYPE_DEFAULT:
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desc = "Default: Deflate method 8, 32K window";
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break;
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default:
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desc = "Unknown";
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break;
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}
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printf("%s (%d)\n", desc, compression_type);
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printf(" filter type: ");
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switch (filter_type) {
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case PNG_FILTER_TYPE_DEFAULT:
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desc = "Single row per-byte";
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break;
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case PNG_INTRAPIXEL_DIFFERENCING:
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desc = "Intrapixel Differencing [for MNG files]";
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break;
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default:
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desc = "Unknown";
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break;
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}
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printf("%s (%d)\n", desc, filter_type);
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}
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if (ppng) {
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// free PNG handle / info structures
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if (!pinfo)
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png_destroy_read_struct(&ppng, png_infopp_NULL, png_infopp_NULL);
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else
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png_destroy_read_struct(&ppng, &pinfo, png_infopp_NULL);
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}
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delete pfile;
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pfile = NULL;
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}
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int
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main(int argc, char **argv)
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{
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if (argc == 1) {
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printf("\npnginfo - reports information about PNG images\n");
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printf("\nUsage:\n");
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printf("pnginfo [options] filename.png\n\n");
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}
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else {
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int32 first = 1;
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for (int32 i = first; i < argc; i++)
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PrintPNGInfo(argv[i]);
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}
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printf("\n");
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return 0;
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}
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