From ad38bc6ecb80ddeb562841b33258dd53659b1da6 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?J=C3=B6rg=20Frings-F=C3=BCrst?= Date: Mon, 24 Aug 2020 18:44:51 +0200 Subject: New upstream version 1.0.31 --- backend/escl/escl_png.c | 157 ++++++++++++++++++++++++------------------------ 1 file changed, 80 insertions(+), 77 deletions(-) (limited to 'backend/escl/escl_png.c') diff --git a/backend/escl/escl_png.c b/backend/escl/escl_png.c index 18f6f35..cf92449 100644 --- a/backend/escl/escl_png.c +++ b/backend/escl/escl_png.c @@ -49,14 +49,15 @@ * \return SANE_STATUS_GOOD (if everything is OK, otherwise, SANE_STATUS_NO_MEM/SANE_STATUS_INVAL) */ SANE_Status -get_PNG_data(capabilities_t *scanner, int *w, int *h, int *components) +get_PNG_data(capabilities_t *scanner, int *width, int *height, int *bps) { - unsigned int width = 0; /* largeur */ - unsigned int height = 0; /* hauteur */ - int bps = 3; /* composantes d'un texel */ - unsigned char *texels = NULL; /* données de l'image */ + unsigned int w = 0; + unsigned int h = 0; + int components = 3; + unsigned char *surface = NULL; /* Image data */ unsigned int i = 0; png_byte magic[8]; + SANE_Status status = SANE_STATUS_GOOD; // read magic number fread (magic, 1, sizeof (magic), scanner->tmp); @@ -64,11 +65,8 @@ get_PNG_data(capabilities_t *scanner, int *w, int *h, int *components) if (!png_check_sig (magic, sizeof (magic))) { DBG( 1, "Escl Png : PNG error is not a valid PNG image!\n"); - if (scanner->tmp) { - fclose(scanner->tmp); - scanner->tmp = NULL; - } - return (SANE_STATUS_INVAL); + status = SANE_STATUS_INVAL; + goto close_file; } // create a png read struct png_structp png_ptr = png_create_read_struct @@ -76,12 +74,8 @@ get_PNG_data(capabilities_t *scanner, int *w, int *h, int *components) if (!png_ptr) { DBG( 1, "Escl Png : PNG error create a png read struct\n"); - if (scanner->tmp) - if (scanner->tmp) { - fclose(scanner->tmp); - scanner->tmp = NULL; - } - return (SANE_STATUS_INVAL); + status = SANE_STATUS_INVAL; + goto close_file; } // create a png info struct png_infop info_ptr = png_create_info_struct (png_ptr); @@ -89,26 +83,19 @@ get_PNG_data(capabilities_t *scanner, int *w, int *h, int *components) { DBG( 1, "Escl Png : PNG error create a png info struct\n"); png_destroy_read_struct (&png_ptr, NULL, NULL); - if (scanner->tmp) { - fclose(scanner->tmp); - scanner->tmp = NULL; - } - return (SANE_STATUS_INVAL); + status = SANE_STATUS_INVAL; + goto close_file; } // initialize the setjmp for returning properly after a libpng // error occured if (setjmp (png_jmpbuf (png_ptr))) { png_destroy_read_struct (&png_ptr, &info_ptr, NULL); - if (texels) - free (texels); - fprintf(stderr,"PNG read error.\n"); - if (scanner->tmp) { - fclose(scanner->tmp); - scanner->tmp = NULL; - } + if (surface) + free (surface); DBG( 1, "Escl Png : PNG read error.\n"); - return (SANE_STATUS_INVAL); + status = SANE_STATUS_INVAL; + goto close_file; } // setup libpng for using standard C fread() function // with our FILE pointer @@ -128,63 +115,79 @@ get_PNG_data(capabilities_t *scanner, int *w, int *h, int *components) png_set_palette_to_rgb (png_ptr); else if (color_type != PNG_COLOR_TYPE_RGB && color_type != PNG_COLOR_TYPE_RGB_ALPHA) { - fprintf(stderr,"PNG format not supported.\n"); - if (scanner->tmp) { - fclose(scanner->tmp); - scanner->tmp = NULL; - } - return (SANE_STATUS_INVAL); + DBG(1, "PNG format not supported.\n"); + status = SANE_STATUS_NO_MEM; + goto close_file; } + if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) - bps = 4; + components = 4; else - bps = 3; - if (png_get_valid (png_ptr, info_ptr, PNG_INFO_tRNS)) - png_set_tRNS_to_alpha (png_ptr); - if (bit_depth == 16) - png_set_strip_16 (png_ptr); - else if (bit_depth < 8) - png_set_packing (png_ptr); - // update info structure to apply transformations - png_read_update_info (png_ptr, info_ptr); - // retrieve updated information - png_get_IHDR (png_ptr, info_ptr, - (png_uint_32*)(&width), - (png_uint_32*)(&height), - &bit_depth, &color_type, - NULL, NULL, NULL); - - *w = (int)width; - *h = (int)height; - *components = bps; - // we can now allocate memory for storing pixel data - texels = (unsigned char *)malloc (sizeof (unsigned char) * width - * height * bps); - png_bytep *row_pointers; - // setup a pointer array. Each one points at the begening of a row. - row_pointers = (png_bytep *)malloc (sizeof (png_bytep) * height); - for (i = 0; i < height; ++i) - { - row_pointers[i] = (png_bytep)(texels + - ((height - (i + 1)) * width * bps)); - } - // read pixel data using row pointers - png_read_image (png_ptr, row_pointers); - // we don't need row pointers anymore - scanner->img_data = texels; - scanner->img_size = (int)(width * height * bps); - scanner->img_read = 0; - free (row_pointers); - fclose(scanner->tmp); + components = 3; + + if (png_get_valid (png_ptr, info_ptr, PNG_INFO_tRNS)) + png_set_tRNS_to_alpha (png_ptr); + if (bit_depth == 16) + png_set_strip_16 (png_ptr); + else if (bit_depth < 8) + png_set_packing (png_ptr); + // update info structure to apply transformations + png_read_update_info (png_ptr, info_ptr); + // retrieve updated information + png_get_IHDR (png_ptr, info_ptr, + (png_uint_32*)(&w), + (png_uint_32*)(&h), + &bit_depth, &color_type, + NULL, NULL, NULL); + + *bps = components; + // we can now allocate memory for storing pixel data + surface = (unsigned char *)malloc (sizeof (unsigned char) * w + * h * components); + if (!surface) { + DBG( 1, "Escl Png : texels Memory allocation problem\n"); + status = SANE_STATUS_NO_MEM; + goto close_file; + } + png_bytep *row_pointers; + // setup a pointer array. Each one points at the begening of a row. + row_pointers = (png_bytep *)malloc (sizeof (png_bytep) * h); + if (!row_pointers) { + DBG( 1, "Escl Png : row_pointers Memory allocation problem\n"); + free(surface); + status = SANE_STATUS_NO_MEM; + goto close_file; + } + for (i = 0; i < h; ++i) + { + row_pointers[i] = (png_bytep)(surface + + ((h - (i + 1)) * w * components)); + } + // read pixel data using row pointers + png_read_image (png_ptr, row_pointers); + + // If necessary, trim the image. + surface = escl_crop_surface(scanner, surface, w, h, components, width, height); + if (!surface) { + DBG( 1, "Escl Png : Surface Memory allocation problem\n"); + status = SANE_STATUS_NO_MEM; + goto close_file; + } + + free (row_pointers); + +close_file: + if (scanner->tmp) + fclose(scanner->tmp); scanner->tmp = NULL; - return (SANE_STATUS_GOOD); + return (status); } #else SANE_Status get_PNG_data(capabilities_t __sane_unused__ *scanner, - int __sane_unused__ *w, - int __sane_unused__ *h, + int __sane_unused__ *width, + int __sane_unused__ *height, int __sane_unused__ *bps) { return (SANE_STATUS_INVAL); -- cgit v1.2.3