X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/75b6e0a0aba793c6b739689b4414c1a2d8fcb041..3e1924dd5f5744c3e2a8973de9b3e4f372b7fd85:/src/png/pngread.c diff --git a/src/png/pngread.c b/src/png/pngread.c index 01613b1641..c9140309eb 100644 --- a/src/png/pngread.c +++ b/src/png/pngread.c @@ -1,11 +1,11 @@ /* pngread.c - read a PNG file * - * libpng 1.0.3 - January 14, 1999 + * Last changed in libpng 1.2.19 August 19, 2007 * For conditions of distribution and use, see copyright notice in png.h - * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. - * Copyright (c) 1996, 1997 Andreas Dilger - * Copyright (c) 1998, 1999 Glenn Randers-Pehrson + * Copyright (c) 1998-2007 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * * This file contains routines that an application calls directly to * read a PNG file or stream. @@ -14,19 +14,21 @@ #define PNG_INTERNAL #include "png.h" +#if defined(PNG_READ_SUPPORTED) + /* Create a PNG structure for reading, and allocate any memory needed. */ -png_structp +png_structp PNGAPI png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn) { #ifdef PNG_USER_MEM_SUPPORTED return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn, - warn_fn, NULL, NULL, NULL)); + warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL)); } /* Alternate create PNG structure for reading, and allocate any memory needed. */ -png_structp +png_structp PNGAPI png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn) @@ -34,19 +36,32 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, #endif /* PNG_USER_MEM_SUPPORTED */ png_structp png_ptr; + +#ifdef PNG_SETJMP_SUPPORTED #ifdef USE_FAR_KEYWORD jmp_buf jmpbuf; #endif +#endif + + int i; + png_debug(1, "in png_create_read_struct\n"); #ifdef PNG_USER_MEM_SUPPORTED - if ((png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, - (png_malloc_ptr)malloc_fn)) == NULL) + png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, + (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr); #else - if ((png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG)) == NULL) + png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); #endif - { - return (png_structp)NULL; - } + if (png_ptr == NULL) + return (NULL); + + /* added at libpng-1.2.6 */ +#ifdef PNG_SET_USER_LIMITS_SUPPORTED + png_ptr->user_width_max=PNG_USER_WIDTH_MAX; + png_ptr->user_height_max=PNG_USER_HEIGHT_MAX; +#endif + +#ifdef PNG_SETJMP_SUPPORTED #ifdef USE_FAR_KEYWORD if (setjmp(jmpbuf)) #else @@ -54,29 +69,64 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, #endif { png_free(png_ptr, png_ptr->zbuf); - png_destroy_struct(png_ptr); - return (png_structp)NULL; + png_ptr->zbuf=NULL; +#ifdef PNG_USER_MEM_SUPPORTED + png_destroy_struct_2((png_voidp)png_ptr, + (png_free_ptr)free_fn, (png_voidp)mem_ptr); +#else + png_destroy_struct((png_voidp)png_ptr); +#endif + return (NULL); } #ifdef USE_FAR_KEYWORD - png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf)); + png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf)); +#endif #endif #ifdef PNG_USER_MEM_SUPPORTED png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn); -#endif /* PNG_USER_MEM_SUPPORTED */ +#endif png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); - /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so - * we must recompile any applications that use any older library version. - * For versions after libpng 1.0, we will be compatible, so we need - * only check the first digit. - */ - if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || - (user_png_ver[0] == '0' && user_png_ver[2] < '9')) + i=0; + do { - png_error(png_ptr, - "Incompatible libpng version in application and library"); + if(user_png_ver[i] != png_libpng_ver[i]) + png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; + } while (png_libpng_ver[i++]); + + if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) + { + /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so + * we must recompile any applications that use any older library version. + * For versions after libpng 1.0, we will be compatible, so we need + * only check the first digit. + */ + if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || + (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) || + (user_png_ver[0] == '0' && user_png_ver[2] < '9')) + { +#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) + char msg[80]; + if (user_png_ver) + { + png_snprintf(msg, 80, + "Application was compiled with png.h from libpng-%.20s", + user_png_ver); + png_warning(png_ptr, msg); + } + png_snprintf(msg, 80, + "Application is running with png.c from libpng-%.20s", + png_libpng_ver); + png_warning(png_ptr, msg); +#endif +#ifdef PNG_ERROR_NUMBERS_SUPPORTED + png_ptr->flags=0; +#endif + png_error(png_ptr, + "Incompatible libpng version in application and library"); + } } /* initialize zbuf - compression buffer */ @@ -99,28 +149,139 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, png_ptr->zstream.next_out = png_ptr->zbuf; png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - png_set_read_fn(png_ptr, NULL, NULL); + png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL); +#ifdef PNG_SETJMP_SUPPORTED +/* Applications that neglect to set up their own setjmp() and then encounter + a png_error() will longjmp here. Since the jmpbuf is then meaningless we + abort instead of returning. */ +#ifdef USE_FAR_KEYWORD + if (setjmp(jmpbuf)) + PNG_ABORT(); + png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf)); +#else + if (setjmp(png_ptr->jmpbuf)) + PNG_ABORT(); +#endif +#endif return (png_ptr); } +#if defined(PNG_1_0_X) || defined(PNG_1_2_X) /* Initialize PNG structure for reading, and allocate any memory needed. This interface is deprecated in favour of the png_create_read_struct(), - and it will eventually disappear. */ -void + and it will disappear as of libpng-1.3.0. */ +#undef png_read_init +void PNGAPI png_read_init(png_structp png_ptr) { + /* We only come here via pre-1.0.7-compiled applications */ + png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0); +} + +void PNGAPI +png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver, + png_size_t png_struct_size, png_size_t png_info_size) +{ + /* We only come here via pre-1.0.12-compiled applications */ + if(png_ptr == NULL) return; +#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) + if(png_sizeof(png_struct) > png_struct_size || + png_sizeof(png_info) > png_info_size) + { + char msg[80]; + png_ptr->warning_fn=NULL; + if (user_png_ver) + { + png_snprintf(msg, 80, + "Application was compiled with png.h from libpng-%.20s", + user_png_ver); + png_warning(png_ptr, msg); + } + png_snprintf(msg, 80, + "Application is running with png.c from libpng-%.20s", + png_libpng_ver); + png_warning(png_ptr, msg); + } +#endif + if(png_sizeof(png_struct) > png_struct_size) + { + png_ptr->error_fn=NULL; +#ifdef PNG_ERROR_NUMBERS_SUPPORTED + png_ptr->flags=0; +#endif + png_error(png_ptr, + "The png struct allocated by the application for reading is too small."); + } + if(png_sizeof(png_info) > png_info_size) + { + png_ptr->error_fn=NULL; +#ifdef PNG_ERROR_NUMBERS_SUPPORTED + png_ptr->flags=0; +#endif + png_error(png_ptr, + "The info struct allocated by application for reading is too small."); + } + png_read_init_3(&png_ptr, user_png_ver, png_struct_size); +} +#endif /* PNG_1_0_X || PNG_1_2_X */ + +void PNGAPI +png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver, + png_size_t png_struct_size) +{ +#ifdef PNG_SETJMP_SUPPORTED jmp_buf tmp_jmp; /* to save current jump buffer */ +#endif + + int i=0; + + png_structp png_ptr=*ptr_ptr; + + if(png_ptr == NULL) return; + + do + { + if(user_png_ver[i] != png_libpng_ver[i]) + { +#ifdef PNG_LEGACY_SUPPORTED + png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; +#else + png_ptr->warning_fn=NULL; + png_warning(png_ptr, + "Application uses deprecated png_read_init() and should be recompiled."); + break; +#endif + } + } while (png_libpng_ver[i++]); - png_debug(1, "in png_read_init\n"); + png_debug(1, "in png_read_init_3\n"); + +#ifdef PNG_SETJMP_SUPPORTED /* save jump buffer and error functions */ - png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf)); + png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf)); +#endif + + if(png_sizeof(png_struct) > png_struct_size) + { + png_destroy_struct(png_ptr); + *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); + png_ptr = *ptr_ptr; + } /* reset all variables to 0 */ - png_memset(png_ptr, 0, sizeof (png_struct)); + png_memset(png_ptr, 0, png_sizeof (png_struct)); +#ifdef PNG_SETJMP_SUPPORTED /* restore jump buffer */ - png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf)); + png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf)); +#endif + + /* added at libpng-1.2.6 */ +#ifdef PNG_SET_USER_LIMITS_SUPPORTED + png_ptr->user_width_max=PNG_USER_WIDTH_MAX; + png_ptr->user_height_max=PNG_USER_HEIGHT_MAX; +#endif /* initialize zbuf - compression buffer */ png_ptr->zbuf_size = PNG_ZBUF_SIZE; @@ -142,9 +303,10 @@ png_read_init(png_structp png_ptr) png_ptr->zstream.next_out = png_ptr->zbuf; png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - png_set_read_fn(png_ptr, NULL, NULL); + png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL); } +#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED /* Read the information before the actual image data. This has been * changed in v0.90 to allow reading a file that already has the magic * bytes read from the stream. You can tell libpng how many bytes have @@ -153,11 +315,11 @@ png_read_init(png_structp png_ptr) * here. The application can then have access to the signature bytes we * read if it is determined that this isn't a valid PNG file. */ -void +void PNGAPI png_read_info(png_structp png_ptr, png_infop info_ptr) { + if(png_ptr == NULL) return; png_debug(1, "in png_read_info\n"); - /* save jump buffer and error functions */ /* If we haven't checked all of the PNG signature bytes, do so now. */ if (png_ptr->sig_bytes < 8) { @@ -175,30 +337,113 @@ png_read_info(png_structp png_ptr, png_infop info_ptr) else png_error(png_ptr, "PNG file corrupted by ASCII conversion"); } + if (num_checked < 3) + png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE; } for(;;) { +#ifdef PNG_USE_LOCAL_ARRAYS + PNG_CONST PNG_IHDR; + PNG_CONST PNG_IDAT; + PNG_CONST PNG_IEND; + PNG_CONST PNG_PLTE; +#if defined(PNG_READ_bKGD_SUPPORTED) + PNG_CONST PNG_bKGD; +#endif +#if defined(PNG_READ_cHRM_SUPPORTED) + PNG_CONST PNG_cHRM; +#endif +#if defined(PNG_READ_gAMA_SUPPORTED) + PNG_CONST PNG_gAMA; +#endif +#if defined(PNG_READ_hIST_SUPPORTED) + PNG_CONST PNG_hIST; +#endif +#if defined(PNG_READ_iCCP_SUPPORTED) + PNG_CONST PNG_iCCP; +#endif +#if defined(PNG_READ_iTXt_SUPPORTED) + PNG_CONST PNG_iTXt; +#endif +#if defined(PNG_READ_oFFs_SUPPORTED) + PNG_CONST PNG_oFFs; +#endif +#if defined(PNG_READ_pCAL_SUPPORTED) + PNG_CONST PNG_pCAL; +#endif +#if defined(PNG_READ_pHYs_SUPPORTED) + PNG_CONST PNG_pHYs; +#endif +#if defined(PNG_READ_sBIT_SUPPORTED) + PNG_CONST PNG_sBIT; +#endif +#if defined(PNG_READ_sCAL_SUPPORTED) + PNG_CONST PNG_sCAL; +#endif +#if defined(PNG_READ_sPLT_SUPPORTED) + PNG_CONST PNG_sPLT; +#endif +#if defined(PNG_READ_sRGB_SUPPORTED) + PNG_CONST PNG_sRGB; +#endif +#if defined(PNG_READ_tEXt_SUPPORTED) + PNG_CONST PNG_tEXt; +#endif +#if defined(PNG_READ_tIME_SUPPORTED) + PNG_CONST PNG_tIME; +#endif +#if defined(PNG_READ_tRNS_SUPPORTED) + PNG_CONST PNG_tRNS; +#endif +#if defined(PNG_READ_zTXt_SUPPORTED) + PNG_CONST PNG_zTXt; +#endif +#endif /* PNG_USE_LOCAL_ARRAYS */ png_byte chunk_length[4]; png_uint_32 length; png_read_data(png_ptr, chunk_length, 4); - length = png_get_uint_32(chunk_length); + length = png_get_uint_31(png_ptr,chunk_length); png_reset_crc(png_ptr); png_crc_read(png_ptr, png_ptr->chunk_name, 4); - png_debug1(0, "Reading %s chunk.\n", png_ptr->chunk_name); + png_debug2(0, "Reading %s chunk, length=%lu.\n", png_ptr->chunk_name, + length); /* This should be a binary subdivision search or a hash for * matching the chunk name rather than a linear search. */ + if (!png_memcmp(png_ptr->chunk_name, (png_bytep)png_IDAT, 4)) + if(png_ptr->mode & PNG_AFTER_IDAT) + png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT; + if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4)) png_handle_IHDR(png_ptr, info_ptr, length); - else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) - png_handle_PLTE(png_ptr, info_ptr, length); else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4)) png_handle_IEND(png_ptr, info_ptr, length); +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name)) + { + if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) + png_ptr->mode |= PNG_HAVE_IDAT; + png_handle_unknown(png_ptr, info_ptr, length); + if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) + png_ptr->mode |= PNG_HAVE_PLTE; + else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) + { + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before IDAT"); + else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && + !(png_ptr->mode & PNG_HAVE_PLTE)) + png_error(png_ptr, "Missing PLTE before IDAT"); + break; + } + } +#endif + else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) + png_handle_PLTE(png_ptr, info_ptr, length); else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) { if (!(png_ptr->mode & PNG_HAVE_IHDR)) @@ -235,6 +480,10 @@ png_read_info(png_structp png_ptr, png_infop info_ptr) else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4)) png_handle_pCAL(png_ptr, info_ptr, length); #endif +#if defined(PNG_READ_sCAL_SUPPORTED) + else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4)) + png_handle_sCAL(png_ptr, info_ptr, length); +#endif #if defined(PNG_READ_pHYs_SUPPORTED) else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4)) png_handle_pHYs(png_ptr, info_ptr, length); @@ -247,6 +496,14 @@ png_read_info(png_structp png_ptr, png_infop info_ptr) else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4)) png_handle_sRGB(png_ptr, info_ptr, length); #endif +#if defined(PNG_READ_iCCP_SUPPORTED) + else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4)) + png_handle_iCCP(png_ptr, info_ptr, length); +#endif +#if defined(PNG_READ_sPLT_SUPPORTED) + else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4)) + png_handle_sPLT(png_ptr, info_ptr, length); +#endif #if defined(PNG_READ_tEXt_SUPPORTED) else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4)) png_handle_tEXt(png_ptr, info_ptr, length); @@ -262,44 +519,61 @@ png_read_info(png_structp png_ptr, png_infop info_ptr) #if defined(PNG_READ_zTXt_SUPPORTED) else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4)) png_handle_zTXt(png_ptr, info_ptr, length); +#endif +#if defined(PNG_READ_iTXt_SUPPORTED) + else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4)) + png_handle_iTXt(png_ptr, info_ptr, length); #endif else png_handle_unknown(png_ptr, info_ptr, length); } } +#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ /* optional call to update the users info_ptr structure */ -void +void PNGAPI png_read_update_info(png_structp png_ptr, png_infop info_ptr) { png_debug(1, "in png_read_update_info\n"); - /* save jump buffer and error functions */ + if(png_ptr == NULL) return; if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) png_read_start_row(png_ptr); + else + png_warning(png_ptr, + "Ignoring extra png_read_update_info() call; row buffer not reallocated"); png_read_transform_info(png_ptr, info_ptr); } +#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED /* Initialize palette, background, etc, after transformations * are set, but before any reading takes place. This allows * the user to obtain a gamma-corrected palette, for example. * If the user doesn't call this, we will do it ourselves. */ -void +void PNGAPI png_start_read_image(png_structp png_ptr) { png_debug(1, "in png_start_read_image\n"); - /* save jump buffer and error functions */ + if(png_ptr == NULL) return; if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) png_read_start_row(png_ptr); } +#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ -void +#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED +void PNGAPI png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) { +#ifdef PNG_USE_LOCAL_ARRAYS + PNG_CONST PNG_IDAT; + PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, + 0xff}; + PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; +#endif int ret; - png_debug2(1, "in png_read_row (row %d, pass %d)\n", + if(png_ptr == NULL) return; + png_debug2(1, "in png_read_row (row %lu, pass %d)\n", png_ptr->row_number, png_ptr->pass); - /* save jump buffer and error functions */ if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) png_read_start_row(png_ptr); if (png_ptr->row_number == 0 && png_ptr->pass == 0) @@ -342,7 +616,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) switch (png_ptr->pass) { case 0: - if (png_ptr->row_number & 7) + if (png_ptr->row_number & 0x07) { if (dsp_row != NULL) png_combine_row(png_ptr, dsp_row, @@ -352,7 +626,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) } break; case 1: - if ((png_ptr->row_number & 7) || png_ptr->width < 5) + if ((png_ptr->row_number & 0x07) || png_ptr->width < 5) { if (dsp_row != NULL) png_combine_row(png_ptr, dsp_row, @@ -362,7 +636,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) } break; case 2: - if ((png_ptr->row_number & 7) != 4) + if ((png_ptr->row_number & 0x07) != 4) { if (dsp_row != NULL && (png_ptr->row_number & 4)) png_combine_row(png_ptr, dsp_row, @@ -428,7 +702,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) png_crc_finish(png_ptr, 0); png_read_data(png_ptr, chunk_length, 4); - png_ptr->idat_size = png_get_uint_32(chunk_length); + png_ptr->idat_size = png_get_uint_31(png_ptr,chunk_length); png_reset_crc(png_ptr); png_crc_read(png_ptr, png_ptr->chunk_name, 4); @@ -464,11 +738,10 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) png_ptr->row_info.channels = png_ptr->channels; png_ptr->row_info.bit_depth = png_ptr->bit_depth; png_ptr->row_info.pixel_depth = png_ptr->pixel_depth; - { - png_ptr->row_info.rowbytes = ((png_ptr->row_info.width * - (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3); - } + png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, + png_ptr->row_info.width); + if(png_ptr->row_buf[0]) png_read_filter_row(png_ptr, &(png_ptr->row_info), png_ptr->row_buf + 1, png_ptr->prev_row + 1, (int)(png_ptr->row_buf[0])); @@ -476,7 +749,17 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf, png_ptr->rowbytes + 1); - if (png_ptr->transformations) +#if defined(PNG_MNG_FEATURES_SUPPORTED) + if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && + (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) + { + /* Intrapixel differencing */ + png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1); + } +#endif + + + if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA)) png_do_read_transformations(png_ptr); #if defined(PNG_READ_INTERLACING_SUPPORTED) @@ -485,8 +768,11 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) (png_ptr->transformations & PNG_INTERLACE)) { if (png_ptr->pass < 6) +/* old interface (pre-1.0.9): png_do_read_interlace(&(png_ptr->row_info), png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); + */ + png_do_read_interlace(png_ptr); if (dsp_row != NULL) png_combine_row(png_ptr, dsp_row, @@ -508,7 +794,9 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) if (png_ptr->read_row_fn != NULL) (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass); } +#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ +#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED /* Read one or more rows of image data. If the image is interlaced, * and png_set_interlace_handling() has been called, the rows need to * contain the contents of the rows from the previous pass. If the @@ -530,10 +818,10 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) * not called png_set_interlace_handling(), the display_row buffer will * be ignored, so pass NULL to it. * - * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.3. + * [*] png_handle_alpha() does not exist yet, as of this version of libpng */ -void +void PNGAPI png_read_rows(png_structp png_ptr, png_bytepp row, png_bytepp display_row, png_uint_32 num_rows) { @@ -542,7 +830,7 @@ png_read_rows(png_structp png_ptr, png_bytepp row, png_bytepp dp; png_debug(1, "in png_read_rows\n"); - /* save jump buffer and error functions */ + if(png_ptr == NULL) return; rp = row; dp = display_row; if (rp != NULL && dp != NULL) @@ -557,18 +845,20 @@ png_read_rows(png_structp png_ptr, png_bytepp row, for (i = 0; i < num_rows; i++) { png_bytep rptr = *rp; - png_read_row(png_ptr, rptr, NULL); + png_read_row(png_ptr, rptr, png_bytep_NULL); rp++; } else if(dp != NULL) for (i = 0; i < num_rows; i++) { png_bytep dptr = *dp; - png_read_row(png_ptr, NULL, dptr); + png_read_row(png_ptr, png_bytep_NULL, dptr); dp++; } } +#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ +#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED /* Read the entire image. If the image has an alpha channel or a tRNS * chunk, and you have called png_handle_alpha()[*], you will need to * initialize the image to the current image that PNG will be overlaying. @@ -579,9 +869,9 @@ png_read_rows(png_structp png_ptr, png_bytepp row, * only call this function once. If you desire to have an image for * each pass of a interlaced image, use png_read_rows() instead. * - * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.3. + * [*] png_handle_alpha() does not exist yet, as of this version of libpng */ -void +void PNGAPI png_read_image(png_structp png_ptr, png_bytepp image) { png_uint_32 i,image_height; @@ -589,8 +879,17 @@ png_read_image(png_structp png_ptr, png_bytepp image) png_bytepp rp; png_debug(1, "in png_read_image\n"); - /* save jump buffer and error functions */ + if(png_ptr == NULL) return; + +#ifdef PNG_READ_INTERLACING_SUPPORTED pass = png_set_interlace_handling(png_ptr); +#else + if (png_ptr->interlaced) + png_error(png_ptr, + "Cannot read interlaced image -- interlace handler disabled."); + pass = 1; +#endif + image_height=png_ptr->height; png_ptr->num_rows = image_height; /* Make sure this is set correctly */ @@ -600,30 +899,90 @@ png_read_image(png_structp png_ptr, png_bytepp image) rp = image; for (i = 0; i < image_height; i++) { - png_read_row(png_ptr, *rp, NULL); + png_read_row(png_ptr, *rp, png_bytep_NULL); rp++; } } } +#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ +#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED /* Read the end of the PNG file. Will not read past the end of the * file, will verify the end is accurate, and will read any comments * or time information at the end of the file, if info is not NULL. */ -void +void PNGAPI png_read_end(png_structp png_ptr, png_infop info_ptr) { png_byte chunk_length[4]; png_uint_32 length; png_debug(1, "in png_read_end\n"); - /* save jump buffer and error functions */ + if(png_ptr == NULL) return; png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */ do { +#ifdef PNG_USE_LOCAL_ARRAYS + PNG_CONST PNG_IHDR; + PNG_CONST PNG_IDAT; + PNG_CONST PNG_IEND; + PNG_CONST PNG_PLTE; +#if defined(PNG_READ_bKGD_SUPPORTED) + PNG_CONST PNG_bKGD; +#endif +#if defined(PNG_READ_cHRM_SUPPORTED) + PNG_CONST PNG_cHRM; +#endif +#if defined(PNG_READ_gAMA_SUPPORTED) + PNG_CONST PNG_gAMA; +#endif +#if defined(PNG_READ_hIST_SUPPORTED) + PNG_CONST PNG_hIST; +#endif +#if defined(PNG_READ_iCCP_SUPPORTED) + PNG_CONST PNG_iCCP; +#endif +#if defined(PNG_READ_iTXt_SUPPORTED) + PNG_CONST PNG_iTXt; +#endif +#if defined(PNG_READ_oFFs_SUPPORTED) + PNG_CONST PNG_oFFs; +#endif +#if defined(PNG_READ_pCAL_SUPPORTED) + PNG_CONST PNG_pCAL; +#endif +#if defined(PNG_READ_pHYs_SUPPORTED) + PNG_CONST PNG_pHYs; +#endif +#if defined(PNG_READ_sBIT_SUPPORTED) + PNG_CONST PNG_sBIT; +#endif +#if defined(PNG_READ_sCAL_SUPPORTED) + PNG_CONST PNG_sCAL; +#endif +#if defined(PNG_READ_sPLT_SUPPORTED) + PNG_CONST PNG_sPLT; +#endif +#if defined(PNG_READ_sRGB_SUPPORTED) + PNG_CONST PNG_sRGB; +#endif +#if defined(PNG_READ_tEXt_SUPPORTED) + PNG_CONST PNG_tEXt; +#endif +#if defined(PNG_READ_tIME_SUPPORTED) + PNG_CONST PNG_tIME; +#endif +#if defined(PNG_READ_tRNS_SUPPORTED) + PNG_CONST PNG_tRNS; +#endif +#if defined(PNG_READ_zTXt_SUPPORTED) + PNG_CONST PNG_zTXt; +#endif +#endif /* PNG_USE_LOCAL_ARRAYS */ + png_read_data(png_ptr, chunk_length, 4); - length = png_get_uint_32(chunk_length); + length = png_get_uint_31(png_ptr,chunk_length); png_reset_crc(png_ptr); png_crc_read(png_ptr, png_ptr->chunk_name, 4); @@ -632,20 +991,32 @@ png_read_end(png_structp png_ptr, png_infop info_ptr) if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4)) png_handle_IHDR(png_ptr, info_ptr, length); + else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4)) + png_handle_IEND(png_ptr, info_ptr, length); +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name)) + { + if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) + { + if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) + png_error(png_ptr, "Too many IDAT's found"); + } + png_handle_unknown(png_ptr, info_ptr, length); + if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) + png_ptr->mode |= PNG_HAVE_PLTE; + } +#endif else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) { /* Zero length IDATs are legal after the last IDAT has been * read, but not after other chunks have been read. */ - if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT) + if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) png_error(png_ptr, "Too many IDAT's found"); - else - png_crc_finish(png_ptr, 0); + png_crc_finish(png_ptr, length); } else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) png_handle_PLTE(png_ptr, info_ptr, length); - else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4)) - png_handle_IEND(png_ptr, info_ptr, length); #if defined(PNG_READ_bKGD_SUPPORTED) else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4)) png_handle_bKGD(png_ptr, info_ptr, length); @@ -670,6 +1041,10 @@ png_read_end(png_structp png_ptr, png_infop info_ptr) else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4)) png_handle_pCAL(png_ptr, info_ptr, length); #endif +#if defined(PNG_READ_sCAL_SUPPORTED) + else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4)) + png_handle_sCAL(png_ptr, info_ptr, length); +#endif #if defined(PNG_READ_pHYs_SUPPORTED) else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4)) png_handle_pHYs(png_ptr, info_ptr, length); @@ -682,6 +1057,14 @@ png_read_end(png_structp png_ptr, png_infop info_ptr) else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4)) png_handle_sRGB(png_ptr, info_ptr, length); #endif +#if defined(PNG_READ_iCCP_SUPPORTED) + else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4)) + png_handle_iCCP(png_ptr, info_ptr, length); +#endif +#if defined(PNG_READ_sPLT_SUPPORTED) + else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4)) + png_handle_sPLT(png_ptr, info_ptr, length); +#endif #if defined(PNG_READ_tEXt_SUPPORTED) else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4)) png_handle_tEXt(png_ptr, info_ptr, length); @@ -697,25 +1080,30 @@ png_read_end(png_structp png_ptr, png_infop info_ptr) #if defined(PNG_READ_zTXt_SUPPORTED) else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4)) png_handle_zTXt(png_ptr, info_ptr, length); +#endif +#if defined(PNG_READ_iTXt_SUPPORTED) + else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4)) + png_handle_iTXt(png_ptr, info_ptr, length); #endif else png_handle_unknown(png_ptr, info_ptr, length); } while (!(png_ptr->mode & PNG_HAVE_IEND)); } +#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ /* free all memory used by the read */ -void +void PNGAPI png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr) { png_structp png_ptr = NULL; png_infop info_ptr = NULL, end_info_ptr = NULL; #ifdef PNG_USER_MEM_SUPPORTED - png_free_ptr free_fn = NULL; -#endif /* PNG_USER_MEM_SUPPORTED */ + png_free_ptr free_fn; + png_voidp mem_ptr; +#endif png_debug(1, "in png_destroy_read_struct\n"); - /* save jump buffer and error functions */ if (png_ptr_ptr != NULL) png_ptr = *png_ptr_ptr; @@ -727,53 +1115,59 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, #ifdef PNG_USER_MEM_SUPPORTED free_fn = png_ptr->free_fn; + mem_ptr = png_ptr->mem_ptr; #endif png_read_destroy(png_ptr, info_ptr, end_info_ptr); if (info_ptr != NULL) { -#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED) - png_free(png_ptr, info_ptr->text); +#if defined(PNG_TEXT_SUPPORTED) + png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1); #endif #ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)info_ptr, free_fn); + png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn, + (png_voidp)mem_ptr); #else png_destroy_struct((png_voidp)info_ptr); #endif - *info_ptr_ptr = (png_infop)NULL; + *info_ptr_ptr = NULL; } if (end_info_ptr != NULL) { -#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED) - png_free(png_ptr, end_info_ptr->text); +#if defined(PNG_READ_TEXT_SUPPORTED) + png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1); #endif #ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)end_info_ptr, free_fn); + png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn, + (png_voidp)mem_ptr); #else png_destroy_struct((png_voidp)end_info_ptr); #endif - *end_info_ptr_ptr = (png_infop)NULL; + *end_info_ptr_ptr = NULL; } if (png_ptr != NULL) { #ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)png_ptr, free_fn); + png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn, + (png_voidp)mem_ptr); #else png_destroy_struct((png_voidp)png_ptr); #endif - *png_ptr_ptr = (png_structp)NULL; + *png_ptr_ptr = NULL; } } /* free all memory used by the read (old method) */ -void +void /* PRIVATE */ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr) { +#ifdef PNG_SETJMP_SUPPORTED jmp_buf tmp_jmp; +#endif png_error_ptr error_fn; png_error_ptr warning_fn; png_voidp error_ptr; @@ -782,7 +1176,6 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr #endif png_debug(1, "in png_read_destroy\n"); - /* save jump buffer and error functions */ if (info_ptr != NULL) png_info_destroy(png_ptr, info_ptr); @@ -790,7 +1183,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr png_info_destroy(png_ptr, end_info_ptr); png_free(png_ptr, png_ptr->zbuf); - png_free(png_ptr, png_ptr->row_buf); + png_free(png_ptr, png_ptr->big_row_buf); png_free(png_ptr, png_ptr->prev_row); #if defined(PNG_READ_DITHER_SUPPORTED) png_free(png_ptr, png_ptr->palette_lookup); @@ -803,13 +1196,37 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr png_free(png_ptr, png_ptr->gamma_from_1); png_free(png_ptr, png_ptr->gamma_to_1); #endif - if (png_ptr->flags & PNG_FLAG_FREE_PALETTE) +#ifdef PNG_FREE_ME_SUPPORTED + if (png_ptr->free_me & PNG_FREE_PLTE) png_zfree(png_ptr, png_ptr->palette); - if (png_ptr->flags & PNG_FLAG_FREE_TRANS) + png_ptr->free_me &= ~PNG_FREE_PLTE; +#else + if (png_ptr->flags & PNG_FLAG_FREE_PLTE) + png_zfree(png_ptr, png_ptr->palette); + png_ptr->flags &= ~PNG_FLAG_FREE_PLTE; +#endif +#if defined(PNG_tRNS_SUPPORTED) || \ + defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) +#ifdef PNG_FREE_ME_SUPPORTED + if (png_ptr->free_me & PNG_FREE_TRNS) + png_free(png_ptr, png_ptr->trans); + png_ptr->free_me &= ~PNG_FREE_TRNS; +#else + if (png_ptr->flags & PNG_FLAG_FREE_TRNS) png_free(png_ptr, png_ptr->trans); + png_ptr->flags &= ~PNG_FLAG_FREE_TRNS; +#endif +#endif #if defined(PNG_READ_hIST_SUPPORTED) +#ifdef PNG_FREE_ME_SUPPORTED + if (png_ptr->free_me & PNG_FREE_HIST) + png_free(png_ptr, png_ptr->hist); + png_ptr->free_me &= ~PNG_FREE_HIST; +#else if (png_ptr->flags & PNG_FLAG_FREE_HIST) png_free(png_ptr, png_ptr->hist); + png_ptr->flags &= ~PNG_FLAG_FREE_HIST; +#endif #endif #if defined(PNG_READ_GAMMA_SUPPORTED) if (png_ptr->gamma_16_table != NULL) @@ -847,17 +1264,25 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr #endif #if defined(PNG_TIME_RFC1123_SUPPORTED) png_free(png_ptr, png_ptr->time_buffer); -#endif /* PNG_TIME_RFC1123_SUPPORTED */ +#endif inflateEnd(&png_ptr->zstream); #ifdef PNG_PROGRESSIVE_READ_SUPPORTED png_free(png_ptr, png_ptr->save_buffer); #endif +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED +#ifdef PNG_TEXT_SUPPORTED + png_free(png_ptr, png_ptr->current_text); +#endif /* PNG_TEXT_SUPPORTED */ +#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ + /* Save the important info out of the png_struct, in case it is * being used again. */ - png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf)); +#ifdef PNG_SETJMP_SUPPORTED + png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf)); +#endif error_fn = png_ptr->error_fn; warning_fn = png_ptr->warning_fn; @@ -866,7 +1291,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr free_fn = png_ptr->free_fn; #endif - png_memset(png_ptr, 0, sizeof (png_struct)); + png_memset(png_ptr, 0, png_sizeof (png_struct)); png_ptr->error_fn = error_fn; png_ptr->warning_fn = warning_fn; @@ -875,11 +1300,173 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr png_ptr->free_fn = free_fn; #endif - png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf)); +#ifdef PNG_SETJMP_SUPPORTED + png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf)); +#endif + } -void +void PNGAPI png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn) { + if(png_ptr == NULL) return; png_ptr->read_row_fn = read_row_fn; } + + +#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED +#if defined(PNG_INFO_IMAGE_SUPPORTED) +void PNGAPI +png_read_png(png_structp png_ptr, png_infop info_ptr, + int transforms, + voidp params) +{ + int row; + + if(png_ptr == NULL) return; +#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) + /* invert the alpha channel from opacity to transparency + */ + if (transforms & PNG_TRANSFORM_INVERT_ALPHA) + png_set_invert_alpha(png_ptr); +#endif + + /* png_read_info() gives us all of the information from the + * PNG file before the first IDAT (image data chunk). + */ + png_read_info(png_ptr, info_ptr); + if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep)) + png_error(png_ptr,"Image is too high to process with png_read_png()"); + + /* -------------- image transformations start here ------------------- */ + +#if defined(PNG_READ_16_TO_8_SUPPORTED) + /* tell libpng to strip 16 bit/color files down to 8 bits per color + */ + if (transforms & PNG_TRANSFORM_STRIP_16) + png_set_strip_16(png_ptr); +#endif + +#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) + /* Strip alpha bytes from the input data without combining with + * the background (not recommended). + */ + if (transforms & PNG_TRANSFORM_STRIP_ALPHA) + png_set_strip_alpha(png_ptr); +#endif + +#if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED) + /* Extract multiple pixels with bit depths of 1, 2, or 4 from a single + * byte into separate bytes (useful for paletted and grayscale images). + */ + if (transforms & PNG_TRANSFORM_PACKING) + png_set_packing(png_ptr); +#endif + +#if defined(PNG_READ_PACKSWAP_SUPPORTED) + /* Change the order of packed pixels to least significant bit first + * (not useful if you are using png_set_packing). + */ + if (transforms & PNG_TRANSFORM_PACKSWAP) + png_set_packswap(png_ptr); +#endif + +#if defined(PNG_READ_EXPAND_SUPPORTED) + /* Expand paletted colors into true RGB triplets + * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel + * Expand paletted or RGB images with transparency to full alpha + * channels so the data will be available as RGBA quartets. + */ + if (transforms & PNG_TRANSFORM_EXPAND) + if ((png_ptr->bit_depth < 8) || + (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) || + (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))) + png_set_expand(png_ptr); +#endif + + /* We don't handle background color or gamma transformation or dithering. + */ + +#if defined(PNG_READ_INVERT_SUPPORTED) + /* invert monochrome files to have 0 as white and 1 as black + */ + if (transforms & PNG_TRANSFORM_INVERT_MONO) + png_set_invert_mono(png_ptr); +#endif + +#if defined(PNG_READ_SHIFT_SUPPORTED) + /* If you want to shift the pixel values from the range [0,255] or + * [0,65535] to the original [0,7] or [0,31], or whatever range the + * colors were originally in: + */ + if ((transforms & PNG_TRANSFORM_SHIFT) + && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT)) + { + png_color_8p sig_bit; + + png_get_sBIT(png_ptr, info_ptr, &sig_bit); + png_set_shift(png_ptr, sig_bit); + } +#endif + +#if defined(PNG_READ_BGR_SUPPORTED) + /* flip the RGB pixels to BGR (or RGBA to BGRA) + */ + if (transforms & PNG_TRANSFORM_BGR) + png_set_bgr(png_ptr); +#endif + +#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) + /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) + */ + if (transforms & PNG_TRANSFORM_SWAP_ALPHA) + png_set_swap_alpha(png_ptr); +#endif + +#if defined(PNG_READ_SWAP_SUPPORTED) + /* swap bytes of 16 bit files to least significant byte first + */ + if (transforms & PNG_TRANSFORM_SWAP_ENDIAN) + png_set_swap(png_ptr); +#endif + + /* We don't handle adding filler bytes */ + + /* Optional call to gamma correct and add the background to the palette + * and update info structure. REQUIRED if you are expecting libpng to + * update the palette for you (i.e., you selected such a transform above). + */ + png_read_update_info(png_ptr, info_ptr); + + /* -------------- image transformations end here ------------------- */ + +#ifdef PNG_FREE_ME_SUPPORTED + png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); +#endif + if(info_ptr->row_pointers == NULL) + { + info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr, + info_ptr->height * png_sizeof(png_bytep)); +#ifdef PNG_FREE_ME_SUPPORTED + info_ptr->free_me |= PNG_FREE_ROWS; +#endif + for (row = 0; row < (int)info_ptr->height; row++) + { + info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr, + png_get_rowbytes(png_ptr, info_ptr)); + } + } + + png_read_image(png_ptr, info_ptr->row_pointers); + info_ptr->valid |= PNG_INFO_IDAT; + + /* read rest of file, and get additional chunks in info_ptr - REQUIRED */ + png_read_end(png_ptr, info_ptr); + + transforms = transforms; /* quiet compiler warnings */ + params = params; + +} +#endif /* PNG_INFO_IMAGE_SUPPORTED */ +#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ +#endif /* PNG_READ_SUPPORTED */