mirror of
https://git.code.sf.net/p/libpng/code.git
synced 2025-07-10 18:04:09 +02:00
a74aa9a002
In v1.6.0, size_t became a required type. It should be used consistently. To maintain backwards compatibility, png_size_t is still maintained in deprecated form.
455 lines
12 KiB
C
455 lines
12 KiB
C
/*-------------------------------------
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* PNGFILE.C -- Image File Functions
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*-------------------------------------
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*
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* Copyright 2000,2017 Willem van Schaik.
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*
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* This code is released under the libpng license.
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* For conditions of distribution and use, see the disclaimer
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* and license in png.h
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*/
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#include <windows.h>
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#include <commdlg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <zlib.h>
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#include "png.h"
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#include "pngfile.h"
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#include "cexcept.h"
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define_exception_type(const char *);
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extern struct exception_context the_exception_context[1];
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struct exception_context the_exception_context[1];
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png_const_charp msg;
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static OPENFILENAME ofn;
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static png_structp png_ptr = NULL;
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static png_infop info_ptr = NULL;
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/* cexcept interface */
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static void
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png_cexcept_error(png_structp png_ptr, png_const_charp msg)
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{
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if(png_ptr)
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;
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#ifdef PNG_CONSOLE_IO_SUPPORTED
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fprintf(stderr, "libpng error: %s\n", msg);
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#endif
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{
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Throw msg;
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}
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}
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/* Windows open-file functions */
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void PngFileInitialize (HWND hwnd)
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{
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static TCHAR szFilter[] = TEXT ("PNG Files (*.PNG)\0*.png\0")
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TEXT ("All Files (*.*)\0*.*\0\0");
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ofn.lStructSize = sizeof (OPENFILENAME);
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ofn.hwndOwner = hwnd;
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ofn.hInstance = NULL;
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ofn.lpstrFilter = szFilter;
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ofn.lpstrCustomFilter = NULL;
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ofn.nMaxCustFilter = 0;
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ofn.nFilterIndex = 0;
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ofn.lpstrFile = NULL; /* Set in Open and Close functions */
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ofn.nMaxFile = MAX_PATH;
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ofn.lpstrFileTitle = NULL; /* Set in Open and Close functions */
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ofn.nMaxFileTitle = MAX_PATH;
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ofn.lpstrInitialDir = NULL;
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ofn.lpstrTitle = NULL;
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ofn.Flags = 0; /* Set in Open and Close functions */
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ofn.nFileOffset = 0;
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ofn.nFileExtension = 0;
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ofn.lpstrDefExt = TEXT ("png");
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ofn.lCustData = 0;
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ofn.lpfnHook = NULL;
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ofn.lpTemplateName = NULL;
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}
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BOOL PngFileOpenDlg (HWND hwnd, PTSTR pstrFileName, PTSTR pstrTitleName)
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{
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ofn.hwndOwner = hwnd;
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ofn.lpstrFile = pstrFileName;
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ofn.lpstrFileTitle = pstrTitleName;
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ofn.Flags = OFN_HIDEREADONLY;
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return GetOpenFileName (&ofn);
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}
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BOOL PngFileSaveDlg (HWND hwnd, PTSTR pstrFileName, PTSTR pstrTitleName)
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{
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ofn.hwndOwner = hwnd;
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ofn.lpstrFile = pstrFileName;
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ofn.lpstrFileTitle = pstrTitleName;
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ofn.Flags = OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT;
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return GetSaveFileName (&ofn);
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}
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/* PNG image handler functions */
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BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
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int *piWidth, int *piHeight, int *piChannels, png_color *pBkgColor)
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{
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static FILE *pfFile;
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png_byte pbSig[8];
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int iBitDepth;
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int iColorType;
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double dGamma;
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png_color_16 *pBackground;
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png_uint_32 ulChannels;
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png_uint_32 ulRowBytes;
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png_byte *pbImageData = *ppbImageData;
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static png_byte **ppbRowPointers = NULL;
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int i;
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/* open the PNG input file */
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if (!pstrFileName)
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{
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*ppbImageData = pbImageData = NULL;
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return FALSE;
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}
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if (!(pfFile = fopen(pstrFileName, "rb")))
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{
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*ppbImageData = pbImageData = NULL;
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return FALSE;
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}
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/* first check the eight byte PNG signature */
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fread(pbSig, 1, 8, pfFile);
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if (png_sig_cmp(pbSig, 0, 8))
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{
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*ppbImageData = pbImageData = NULL;
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return FALSE;
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}
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/* create the two png(-info) structures */
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png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL,
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(png_error_ptr)png_cexcept_error, (png_error_ptr)NULL);
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if (!png_ptr)
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{
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*ppbImageData = pbImageData = NULL;
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return FALSE;
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}
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info_ptr = png_create_info_struct(png_ptr);
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if (!info_ptr)
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{
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png_destroy_read_struct(&png_ptr, NULL, NULL);
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*ppbImageData = pbImageData = NULL;
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return FALSE;
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}
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Try
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{
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/* initialize the png structure */
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#ifdef PNG_STDIO_SUPPORTED
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png_init_io(png_ptr, pfFile);
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#else
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png_set_read_fn(png_ptr, (png_voidp)pfFile, png_read_data);
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#endif
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png_set_sig_bytes(png_ptr, 8);
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/* read all PNG info up to image data */
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png_read_info(png_ptr, info_ptr);
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/* get width, height, bit-depth and color-type */
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png_get_IHDR(png_ptr, info_ptr, piWidth, piHeight, &iBitDepth,
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&iColorType, NULL, NULL, NULL);
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/* expand images of all color-type and bit-depth to 3x8-bit RGB */
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/* let the library process alpha, transparency, background, etc. */
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#ifdef PNG_READ_16_TO_8_SUPPORTED
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if (iBitDepth == 16)
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# ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
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png_set_scale_16(png_ptr);
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# else
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png_set_strip_16(png_ptr);
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# endif
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#endif
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if (iColorType == PNG_COLOR_TYPE_PALETTE)
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png_set_expand(png_ptr);
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if (iBitDepth < 8)
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png_set_expand(png_ptr);
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if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
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png_set_expand(png_ptr);
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if (iColorType == PNG_COLOR_TYPE_GRAY ||
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iColorType == PNG_COLOR_TYPE_GRAY_ALPHA)
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png_set_gray_to_rgb(png_ptr);
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/* set the background color to draw transparent and alpha images over */
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if (png_get_bKGD(png_ptr, info_ptr, &pBackground))
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{
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png_set_background(png_ptr, pBackground, PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
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pBkgColor->red = (byte) pBackground->red;
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pBkgColor->green = (byte) pBackground->green;
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pBkgColor->blue = (byte) pBackground->blue;
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}
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else
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{
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pBkgColor = NULL;
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}
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/* if required set gamma conversion */
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if (png_get_gAMA(png_ptr, info_ptr, &dGamma))
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png_set_gamma(png_ptr, (double) 2.2, dGamma);
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/* after the transformations are registered, update info_ptr data */
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png_read_update_info(png_ptr, info_ptr);
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/* get again width, height and the new bit-depth and color-type */
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png_get_IHDR(png_ptr, info_ptr, piWidth, piHeight, &iBitDepth,
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&iColorType, NULL, NULL, NULL);
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/* row_bytes is the width x number of channels */
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ulRowBytes = png_get_rowbytes(png_ptr, info_ptr);
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ulChannels = png_get_channels(png_ptr, info_ptr);
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*piChannels = ulChannels;
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/* now we can allocate memory to store the image */
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if (pbImageData)
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{
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free (pbImageData);
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pbImageData = NULL;
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}
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if ((*piHeight) > ((size_t)(-1))/ulRowBytes) {
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{
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png_error(png_ptr, "Visual PNG: image is too big");
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}
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if ((pbImageData = (png_byte *) malloc(ulRowBytes * (*piHeight)
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* sizeof(png_byte))) == NULL)
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{
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png_error(png_ptr, "Visual PNG: out of memory");
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}
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*ppbImageData = pbImageData;
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/* and allocate memory for an array of row-pointers */
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if ((ppbRowPointers = (png_bytepp) malloc((*piHeight)
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* sizeof(png_bytep))) == NULL)
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{
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png_error(png_ptr, "Visual PNG: out of memory");
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}
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/* set the individual row-pointers to point at the correct offsets */
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for (i = 0; i < (*piHeight); i++)
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ppbRowPointers[i] = pbImageData + i * ulRowBytes;
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/* now we can go ahead and just read the whole image */
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png_read_image(png_ptr, ppbRowPointers);
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/* read the additional chunks in the PNG file (not really needed) */
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png_read_end(png_ptr, NULL);
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/* and we're done */
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free (ppbRowPointers);
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ppbRowPointers = NULL;
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/* yepp, done */
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}
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Catch (msg)
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{
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png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
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*ppbImageData = pbImageData = NULL;
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if(ppbRowPointers)
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free (ppbRowPointers);
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fclose(pfFile);
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return FALSE;
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}
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fclose (pfFile);
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return TRUE;
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}
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BOOL PngSaveImage (PTSTR pstrFileName, png_byte *pDiData,
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int iWidth, int iHeight, png_color bkgColor)
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{
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const int ciBitDepth = 8;
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const int ciChannels = 3;
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static FILE *pfFile;
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png_uint_32 ulRowBytes;
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static png_byte **ppbRowPointers = NULL;
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int i;
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/* open the PNG output file */
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if (!pstrFileName)
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return FALSE;
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if (!(pfFile = fopen(pstrFileName, "wb")))
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return FALSE;
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/* prepare the standard PNG structures */
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png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL,
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(png_error_ptr)png_cexcept_error, (png_error_ptr)NULL);
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if (!png_ptr)
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{
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fclose(pfFile);
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return FALSE;
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}
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info_ptr = png_create_info_struct(png_ptr);
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if (!info_ptr) {
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fclose(pfFile);
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png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
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return FALSE;
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}
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Try
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{
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/* initialize the png structure */
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#ifdef PNG_STDIO_SUPPORTED
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png_init_io(png_ptr, pfFile);
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#else
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png_set_write_fn(png_ptr, (png_voidp)pfFile, png_write_data, png_flush);
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#endif
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/* we're going to write a very simple 3x8-bit RGB image */
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png_set_IHDR(png_ptr, info_ptr, iWidth, iHeight, ciBitDepth,
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PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,
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PNG_FILTER_TYPE_BASE);
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/* write the file header information */
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png_write_info(png_ptr, info_ptr);
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/* swap the BGR pixels in the DiData structure to RGB */
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png_set_bgr(png_ptr);
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/* row_bytes is the width x number of channels */
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ulRowBytes = iWidth * ciChannels;
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/* we can allocate memory for an array of row-pointers */
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if ((ppbRowPointers = (png_bytepp) malloc(iHeight * sizeof(png_bytep))) == NULL)
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Throw "Visualpng: Out of memory";
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/* set the individual row-pointers to point at the correct offsets */
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for (i = 0; i < iHeight; i++)
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ppbRowPointers[i] = pDiData + i * (((ulRowBytes + 3) >> 2) << 2);
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/* write out the entire image data in one call */
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png_write_image (png_ptr, ppbRowPointers);
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/* write the additional chunks to the PNG file (not really needed) */
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png_write_end(png_ptr, info_ptr);
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/* and we're done */
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free (ppbRowPointers);
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ppbRowPointers = NULL;
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/* clean up after the write, and free any memory allocated */
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png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
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/* yepp, done */
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}
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Catch (msg)
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{
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png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
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if(ppbRowPointers)
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free (ppbRowPointers);
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fclose(pfFile);
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return FALSE;
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}
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fclose (pfFile);
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return TRUE;
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}
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#ifndef PNG_STDIO_SUPPORTED
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static void
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png_read_data(png_structp png_ptr, png_bytep data, size_t length)
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{
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size_t check;
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/* fread() returns 0 on error, so it is OK to store this in a size_t
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* instead of an int, which is what fread() actually returns.
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*/
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check = fread(data, 1, length, (FILE *)png_ptr->io_ptr);
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if (check != length)
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{
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png_error(png_ptr, "Read Error");
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}
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}
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static void
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png_write_data(png_structp png_ptr, png_bytep data, size_t length)
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{
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png_uint_32 check;
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check = fwrite(data, 1, length, (FILE *)(png_ptr->io_ptr));
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if (check != length)
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{
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png_error(png_ptr, "Write Error");
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}
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}
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static void
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png_flush(png_structp png_ptr)
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{
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FILE *io_ptr;
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io_ptr = (FILE *)CVT_PTR((png_ptr->io_ptr));
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if (io_ptr != NULL)
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fflush(io_ptr);
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}
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#endif
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/*-----------------
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* end of source
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*-----------------
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*/
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