diff options
Diffstat (limited to 'thirdparty/basis_universal/encoder/apg_bmp.c')
| -rw-r--r-- | thirdparty/basis_universal/encoder/apg_bmp.c | 541 |
1 files changed, 0 insertions, 541 deletions
diff --git a/thirdparty/basis_universal/encoder/apg_bmp.c b/thirdparty/basis_universal/encoder/apg_bmp.c deleted file mode 100644 index d342b20fc8..0000000000 --- a/thirdparty/basis_universal/encoder/apg_bmp.c +++ /dev/null @@ -1,541 +0,0 @@ -/* -BMP File Reader/Writer Implementation -Anton Gerdelan -Version: 3 -Licence: see apg_bmp.h -C99 -*/ - -#ifdef _MSC_VER -#define _CRT_SECURE_NO_WARNINGS 1 -#endif - -#include "apg_bmp.h" -#include <assert.h> -#include <stdbool.h> -#include <stdint.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> - -/* Maximum pixel dimensions of width or height of an image. Should accommodate max used in graphics APIs. - NOTE: 65536*65536 is the biggest number storable in 32 bits. - This needs to be multiplied by n_channels so actual memory indices are not uint32 but size_t to avoid overflow. - Note this will crash stb_image_write et al at maximum size which use 32bits, so reduce max size to accom. */ -#define _BMP_MAX_DIMS 65536 -#define _BMP_FILE_HDR_SZ 14 -#define _BMP_MIN_DIB_HDR_SZ 40 -#define _BMP_MIN_HDR_SZ ( _BMP_FILE_HDR_SZ + _BMP_MIN_DIB_HDR_SZ ) -#define _BMP_MAX_IMAGE_FILE_SIZE (1024ULL*1024ULL*1024ULL) - -#pragma pack( push, 1 ) // supported on GCC in addition to individual packing attribs -/* All BMP files, regardless of type, start with this file header */ -typedef struct _bmp_file_header_t { - char file_type[2]; - uint32_t file_sz; - uint16_t reserved1; - uint16_t reserved2; - uint32_t image_data_offset; -} _bmp_file_header_t; - -/* Following the file header is the BMP type header. this is the most commonly used format */ -typedef struct _bmp_dib_BITMAPINFOHEADER_t { - uint32_t this_header_sz; - int32_t w; // in older headers w & h these are shorts and may be unsigned - int32_t h; // - uint16_t n_planes; // must be 1 - uint16_t bpp; // bits per pixel. 1,4,8,16,24,32. - uint32_t compression_method; // 16 and 32-bit images must have a value of 3 here - uint32_t image_uncompressed_sz; // not consistently used in the wild, so ignored here. - int32_t horiz_pixels_per_meter; // not used. - int32_t vert_pixels_per_meter; // not used. - uint32_t n_colours_in_palette; // - uint32_t n_important_colours; // not used. - /* NOTE(Anton) a DIB header may end here at 40-bytes. be careful using sizeof() */ - /* if 'compression' value, above, is set to 3 ie the image is 16 or 32-bit, then these colour channel masks follow the headers. - these are big-endian order bit masks to assign bits of each pixel to different colours. bits used must be contiguous and not overlap. */ - uint32_t bitmask_r; - uint32_t bitmask_g; - uint32_t bitmask_b; -} _bmp_dib_BITMAPINFOHEADER_t; -#pragma pack( pop ) - -typedef enum _bmp_compression_t { - BI_RGB = 0, - BI_RLE8 = 1, - BI_RLE4 = 2, - BI_BITFIELDS = 3, - BI_JPEG = 4, - BI_PNG = 5, - BI_ALPHABITFIELDS = 6, - BI_CMYK = 11, - BI_CMYKRLE8 = 12, - BI_CMYRLE4 = 13 -} _bmp_compression_t; - -/* convenience struct and file->memory function */ -typedef struct _entire_file_t { - void* data; - size_t sz; -} _entire_file_t; - -/* -RETURNS -- true on success. record->data is allocated memory and must be freed by the caller. -- false on any error. Any allocated memory is freed if false is returned */ -static bool _read_entire_file( const char* filename, _entire_file_t* record ) { - FILE* fp = fopen( filename, "rb" ); - if ( !fp ) { return false; } - fseek( fp, 0L, SEEK_END ); - record->sz = (size_t)ftell( fp ); - - // Immediately bail on anything larger than _BMP_MAX_IMAGE_FILE_SIZE. - if (record->sz > _BMP_MAX_IMAGE_FILE_SIZE) { - fclose( fp ); - return false; - } - - record->data = malloc( record->sz ); - if ( !record->data ) { - fclose( fp ); - return false; - } - rewind( fp ); - size_t nr = fread( record->data, record->sz, 1, fp ); - fclose( fp ); - if ( 1 != nr ) { return false; } - return true; -} - -static bool _validate_file_hdr( _bmp_file_header_t* file_hdr_ptr, size_t file_sz ) { - if ( !file_hdr_ptr ) { return false; } - if ( file_hdr_ptr->file_type[0] != 'B' || file_hdr_ptr->file_type[1] != 'M' ) { return false; } - if ( file_hdr_ptr->image_data_offset > file_sz ) { return false; } - return true; -} - -static bool _validate_dib_hdr( _bmp_dib_BITMAPINFOHEADER_t* dib_hdr_ptr, size_t file_sz ) { - if ( !dib_hdr_ptr ) { return false; } - if ( _BMP_FILE_HDR_SZ + dib_hdr_ptr->this_header_sz > file_sz ) { return false; } - if ( ( 32 == dib_hdr_ptr->bpp || 16 == dib_hdr_ptr->bpp ) && ( BI_BITFIELDS != dib_hdr_ptr->compression_method && BI_ALPHABITFIELDS != dib_hdr_ptr->compression_method ) ) { - return false; - } - if ( BI_RGB != dib_hdr_ptr->compression_method && BI_BITFIELDS != dib_hdr_ptr->compression_method && BI_ALPHABITFIELDS != dib_hdr_ptr->compression_method ) { - return false; - } - // NOTE(Anton) using abs() in the if-statement was blowing up on large negative numbers. switched to labs() - if ( 0 == dib_hdr_ptr->w || 0 == dib_hdr_ptr->h || labs( dib_hdr_ptr->w ) > _BMP_MAX_DIMS || labs( dib_hdr_ptr->h ) > _BMP_MAX_DIMS ) { return false; } - - /* NOTE(Anton) if images reliably used n_colours_in_palette we could have done a palette/file size integrity check here. - because some always set 0 then we have to check every palette indexing as we read them */ - return true; -} - -/* NOTE(Anton) this could have ifdef branches on different compilers for the intrinsics versions for perf */ -static uint32_t _bitscan( uint32_t dword ) { - for ( uint32_t i = 0; i < 32; i++ ) { - if ( 1 & dword ) { return i; } - dword = dword >> 1; - } - return (uint32_t)-1; -} - -unsigned char* apg_bmp_read( const char* filename, int* w, int* h, unsigned int* n_chans ) { - if ( !filename || !w || !h || !n_chans ) { return NULL; } - - // read in the whole file into memory first - much faster than parsing on-the-fly - _entire_file_t record; - if ( !_read_entire_file( filename, &record ) ) { return NULL; } - if ( record.sz < _BMP_MIN_HDR_SZ ) { - free( record.data ); - return NULL; - } - - // grab and validate the first, file, header - _bmp_file_header_t* file_hdr_ptr = (_bmp_file_header_t*)record.data; - if ( !_validate_file_hdr( file_hdr_ptr, record.sz ) ) { - free( record.data ); - return NULL; - } - - // grad and validate the second, DIB, header - _bmp_dib_BITMAPINFOHEADER_t* dib_hdr_ptr = (_bmp_dib_BITMAPINFOHEADER_t*)( (uint8_t*)record.data + _BMP_FILE_HDR_SZ ); - if ( !_validate_dib_hdr( dib_hdr_ptr, record.sz ) ) { - free( record.data ); - return NULL; - } - - // bitmaps can have negative dims to indicate the image should be flipped - uint32_t width = *w = abs( dib_hdr_ptr->w ); - uint32_t height = *h = abs( dib_hdr_ptr->h ); - - // TODO(Anton) flip image memory at the end if this is true. because doing it per row was making me write bugs. - // bool vertically_flip = dib_hdr_ptr->h > 0 ? false : true; - - // channel count and palette are not well defined in the header so we make a good guess here - uint32_t n_dst_chans = 3, n_src_chans = 3; - bool has_palette = false; - switch ( dib_hdr_ptr->bpp ) { - case 32: n_dst_chans = n_src_chans = 4; break; // technically can be RGB but not supported - case 24: n_dst_chans = n_src_chans = 3; break; // technically can be RGBA but not supported - case 8: // seems to always use a BGR0 palette, even for greyscale - n_dst_chans = 3; - has_palette = true; - n_src_chans = 1; - break; - case 4: // always has a palette - needed for a MS-saved BMP - n_dst_chans = 3; - has_palette = true; - n_src_chans = 1; - break; - case 1: // 1-bpp means the palette has 3 colour channels with 2 colours i.e. monochrome but not always black & white - n_dst_chans = 3; - has_palette = true; - n_src_chans = 1; - break; - default: // this includes 2bpp and 16bpp - free( record.data ); - return NULL; - } // endswitch - *n_chans = n_dst_chans; - // NOTE(Anton) some image formats are not allowed a palette - could check for a bad header spec here also - if ( dib_hdr_ptr->n_colours_in_palette > 0 ) { has_palette = true; } - -#ifdef APG_BMP_DEBUG_OUTPUT - printf( "apg_bmp_debug: reading image\n|-filename `%s`\n|-dims %ux%u pixels\n|-bpp %u\n|-n_src_chans %u\n|-n_dst_chans %u\n", filename, *w, *h, - dib_hdr_ptr->bpp, n_src_chans, n_dst_chans ); -#endif - - uint32_t palette_offset = _BMP_FILE_HDR_SZ + dib_hdr_ptr->this_header_sz; - bool has_bitmasks = false; - if ( BI_BITFIELDS == dib_hdr_ptr->compression_method || BI_ALPHABITFIELDS == dib_hdr_ptr->compression_method ) { - has_bitmasks = true; - palette_offset += 12; - } - if ( palette_offset > record.sz ) { - free( record.data ); - return NULL; - } - - // work out if any padding how much to skip at end of each row - uint32_t unpadded_row_sz = width * n_src_chans; - // bit-encoded palette indices have different padding properties - if ( 4 == dib_hdr_ptr->bpp ) { - unpadded_row_sz = width % 2 > 0 ? width / 2 + 1 : width / 2; // find how many whole bytes required for this bit width - } - if ( 1 == dib_hdr_ptr->bpp ) { - unpadded_row_sz = width % 8 > 0 ? width / 8 + 1 : width / 8; // find how many whole bytes required for this bit width - } - uint32_t row_padding_sz = 0 == unpadded_row_sz % 4 ? 0 : 4 - ( unpadded_row_sz % 4 ); // NOTE(Anton) didn't expect operator precedence of - over % - - // another file size integrity check: partially validate source image data size - // 'image_data_offset' is by row padded to 4 bytes and is either colour data or palette indices. - if ( file_hdr_ptr->image_data_offset + ( unpadded_row_sz + row_padding_sz ) * height > record.sz ) { - free( record.data ); - return NULL; - } - - // find which bit number each colour channel starts at, so we can separate colours out - uint32_t bitshift_rgba[4] = {0, 0, 0, 0}; // NOTE(Anton) noticed this was int and not uint32_t so changed it. 17 Mar 2020 - uint32_t bitmask_a = 0; - if ( has_bitmasks ) { - bitmask_a = ~( dib_hdr_ptr->bitmask_r | dib_hdr_ptr->bitmask_g | dib_hdr_ptr->bitmask_b ); - bitshift_rgba[0] = _bitscan( dib_hdr_ptr->bitmask_r ); - bitshift_rgba[1] = _bitscan( dib_hdr_ptr->bitmask_g ); - bitshift_rgba[2] = _bitscan( dib_hdr_ptr->bitmask_b ); - bitshift_rgba[3] = _bitscan( bitmask_a ); - } - - // allocate memory for the output pixels block. cast to size_t in case width and height are both the max of 65536 and n_dst_chans > 1 - unsigned char* dst_img_ptr = (unsigned char*)malloc( (size_t)width * (size_t)height * (size_t)n_dst_chans ); - if ( !dst_img_ptr ) { - free( record.data ); - return NULL; - } - - uint8_t* palette_data_ptr = (uint8_t*)record.data + palette_offset; - uint8_t* src_img_ptr = (uint8_t*)record.data + file_hdr_ptr->image_data_offset; - size_t dst_stride_sz = width * n_dst_chans; - - // == 32-bpp -> 32-bit RGBA. == 32-bit and 16-bit require bitmasks - if ( 32 == dib_hdr_ptr->bpp ) { - // check source image has enough data in it to read from - if ( (size_t)file_hdr_ptr->image_data_offset + (size_t)height * (size_t)width * (size_t)n_src_chans > record.sz ) { - free( record.data ); - free( dst_img_ptr ); - return NULL; - } - size_t src_byte_idx = 0; - for ( uint32_t r = 0; r < height; r++ ) { - size_t dst_pixels_idx = r * dst_stride_sz; - for ( uint32_t c = 0; c < width; c++ ) { - uint32_t pixel; - memcpy( &pixel, &src_img_ptr[src_byte_idx], 4 ); - // NOTE(Anton) the below assumes 32-bits is always RGBA 1 byte per channel. 10,10,10 RGB exists though and isn't handled. - dst_img_ptr[dst_pixels_idx++] = ( uint8_t )( ( pixel & dib_hdr_ptr->bitmask_r ) >> bitshift_rgba[0] ); - dst_img_ptr[dst_pixels_idx++] = ( uint8_t )( ( pixel & dib_hdr_ptr->bitmask_g ) >> bitshift_rgba[1] ); - dst_img_ptr[dst_pixels_idx++] = ( uint8_t )( ( pixel & dib_hdr_ptr->bitmask_b ) >> bitshift_rgba[2] ); - dst_img_ptr[dst_pixels_idx++] = ( uint8_t )( ( pixel & bitmask_a ) >> bitshift_rgba[3] ); - src_byte_idx += 4; - } - src_byte_idx += row_padding_sz; - } - - // == 8-bpp -> 24-bit RGB == - } else if ( 8 == dib_hdr_ptr->bpp && has_palette ) { - // validate indices (body of image data) fits in file - if ( file_hdr_ptr->image_data_offset + height * width > record.sz ) { - free( record.data ); - free( dst_img_ptr ); - return NULL; - } - size_t src_byte_idx = 0; - for ( uint32_t r = 0; r < height; r++ ) { - size_t dst_pixels_idx = ( height - 1 - r ) * dst_stride_sz; - for ( uint32_t c = 0; c < width; c++ ) { - // "most palettes are 4 bytes in RGB0 order but 3 for..." - it was actually BRG0 in old images -- Anton - uint8_t index = src_img_ptr[src_byte_idx]; // 8-bit index value per pixel - - if ( palette_offset + index * 4 + 2 >= record.sz ) { - free( record.data ); - return dst_img_ptr; - } - dst_img_ptr[dst_pixels_idx++] = palette_data_ptr[index * 4 + 2]; - dst_img_ptr[dst_pixels_idx++] = palette_data_ptr[index * 4 + 1]; - dst_img_ptr[dst_pixels_idx++] = palette_data_ptr[index * 4 + 0]; - src_byte_idx++; - } - src_byte_idx += row_padding_sz; - } - - // == 4-bpp (16-colour) -> 24-bit RGB == - } else if ( 4 == dib_hdr_ptr->bpp && has_palette ) { - size_t src_byte_idx = 0; - for ( uint32_t r = 0; r < height; r++ ) { - size_t dst_pixels_idx = ( height - 1 - r ) * dst_stride_sz; - for ( uint32_t c = 0; c < width; c++ ) { - if ( file_hdr_ptr->image_data_offset + src_byte_idx > record.sz ) { - free( record.data ); - free( dst_img_ptr ); - return NULL; - } - // handle 2 pixels at a time - uint8_t pixel_duo = src_img_ptr[src_byte_idx]; - uint8_t a_index = ( 0xFF & pixel_duo ) >> 4; - uint8_t b_index = 0xF & pixel_duo; - - if ( palette_offset + a_index * 4 + 2 >= record.sz ) { // invalid src image - free( record.data ); - return dst_img_ptr; - } - if ( dst_pixels_idx + 3 > width * height * n_dst_chans ) { // done - free( record.data ); - return dst_img_ptr; - } - dst_img_ptr[dst_pixels_idx++] = palette_data_ptr[a_index * 4 + 2]; - dst_img_ptr[dst_pixels_idx++] = palette_data_ptr[a_index * 4 + 1]; - dst_img_ptr[dst_pixels_idx++] = palette_data_ptr[a_index * 4 + 0]; - if ( ++c >= width ) { // advance a column - c = 0; - r++; - if ( r >= height ) { // done. no need to get second pixel. eg a 1x1 pixel image. - free( record.data ); - return dst_img_ptr; - } - dst_pixels_idx = ( height - 1 - r ) * dst_stride_sz; - } - - if ( palette_offset + b_index * 4 + 2 >= record.sz ) { // invalid src image - free( record.data ); - return dst_img_ptr; - } - if ( dst_pixels_idx + 3 > width * height * n_dst_chans ) { // done. probably redundant check since checking r >= height. - free( record.data ); - return dst_img_ptr; - } - dst_img_ptr[dst_pixels_idx++] = palette_data_ptr[b_index * 4 + 2]; - dst_img_ptr[dst_pixels_idx++] = palette_data_ptr[b_index * 4 + 1]; - dst_img_ptr[dst_pixels_idx++] = palette_data_ptr[b_index * 4 + 0]; - src_byte_idx++; - } - src_byte_idx += row_padding_sz; - } - - // == 1-bpp -> 24-bit RGB == - } else if ( 1 == dib_hdr_ptr->bpp && has_palette ) { - /* encoding method for monochrome is not well documented. - a 2x2 pixel image is stored as 4 1-bit palette indexes - the palette is stored as any 2 RGB0 colours (not necessarily B&W) - so for an image with indexes like so: - 1 1 - 0 1 - it is bit-encoded as follows, starting at MSB: - 01000000 00000000 00000000 00000000 (first byte val 64) - 11000000 00000000 00000000 00000000 (first byte val 192) - data is still split by row and each row padded to 4 byte multiples - */ - size_t src_byte_idx = 0; - for ( uint32_t r = 0; r < height; r++ ) { - uint8_t bit_idx = 0; // used in monochrome - size_t dst_pixels_idx = ( height - 1 - r ) * dst_stride_sz; - for ( uint32_t c = 0; c < width; c++ ) { - if ( 8 == bit_idx ) { // start reading from the next byte - src_byte_idx++; - bit_idx = 0; - } - if ( file_hdr_ptr->image_data_offset + src_byte_idx > record.sz ) { - free( record.data ); - return dst_img_ptr; - } - uint8_t pixel_oct = src_img_ptr[src_byte_idx]; - uint8_t bit = 128 >> bit_idx; - uint8_t masked = pixel_oct & bit; - uint8_t palette_idx = masked > 0 ? 1 : 0; - - if ( palette_offset + palette_idx * 4 + 2 >= record.sz ) { - free( record.data ); - return dst_img_ptr; - } - dst_img_ptr[dst_pixels_idx++] = palette_data_ptr[palette_idx * 4 + 2]; - dst_img_ptr[dst_pixels_idx++] = palette_data_ptr[palette_idx * 4 + 1]; - dst_img_ptr[dst_pixels_idx++] = palette_data_ptr[palette_idx * 4 + 0]; - bit_idx++; - } - src_byte_idx += ( row_padding_sz + 1 ); // 1bpp is special here - } - - // == 24-bpp -> 24-bit RGB == (but also should handle some other n_chans cases) - } else { - // NOTE(Anton) this only supports 1 byte per channel - if ( file_hdr_ptr->image_data_offset + height * width * n_dst_chans > record.sz ) { - free( record.data ); - free( dst_img_ptr ); - return NULL; - } - size_t src_byte_idx = 0; - for ( uint32_t r = 0; r < height; r++ ) { - size_t dst_pixels_idx = ( height - 1 - r ) * dst_stride_sz; - for ( uint32_t c = 0; c < width; c++ ) { - // re-orders from BGR to RGB - if ( n_dst_chans > 3 ) { dst_img_ptr[dst_pixels_idx++] = src_img_ptr[src_byte_idx + 3]; } - if ( n_dst_chans > 2 ) { dst_img_ptr[dst_pixels_idx++] = src_img_ptr[src_byte_idx + 2]; } - if ( n_dst_chans > 1 ) { dst_img_ptr[dst_pixels_idx++] = src_img_ptr[src_byte_idx + 1]; } - dst_img_ptr[dst_pixels_idx++] = src_img_ptr[src_byte_idx]; - src_byte_idx += n_src_chans; - } - src_byte_idx += row_padding_sz; - } - } // endif bpp - - free( record.data ); - return dst_img_ptr; -} - -void apg_bmp_free( unsigned char* pixels_ptr ) { - if ( !pixels_ptr ) { return; } - free( pixels_ptr ); -} - -unsigned int apg_bmp_write( const char* filename, unsigned char* pixels_ptr, int w, int h, unsigned int n_chans ) { - if ( !filename || !pixels_ptr ) { return 0; } - if ( 0 == w || 0 == h ) { return 0; } - if ( labs( w ) > _BMP_MAX_DIMS || labs( h ) > _BMP_MAX_DIMS ) { return 0; } - if ( n_chans != 3 && n_chans != 4 ) { return 0; } - - uint32_t height = (uint32_t)labs( h ); - uint32_t width = (uint32_t)labs( w ); - // work out if any padding how much to skip at end of each row - const size_t unpadded_row_sz = width * n_chans; - const size_t row_padding_sz = 0 == unpadded_row_sz % 4 ? 0 : 4 - unpadded_row_sz % 4; - const size_t row_sz = unpadded_row_sz + row_padding_sz; - const size_t dst_pixels_padded_sz = row_sz * height; - - const size_t dib_hdr_sz = sizeof( _bmp_dib_BITMAPINFOHEADER_t ); - _bmp_file_header_t file_hdr; - { - file_hdr.file_type[0] = 'B'; - file_hdr.file_type[1] = 'M'; - file_hdr.file_sz = _BMP_FILE_HDR_SZ + (uint32_t)dib_hdr_sz + (uint32_t)dst_pixels_padded_sz; - file_hdr.reserved1 = 0; - file_hdr.reserved2 = 0; - file_hdr.image_data_offset = _BMP_FILE_HDR_SZ + (uint32_t)dib_hdr_sz; - } - _bmp_dib_BITMAPINFOHEADER_t dib_hdr; - { - dib_hdr.this_header_sz = _BMP_MIN_DIB_HDR_SZ; // NOTE: must be 40 and not include the bitmask memory in size here - dib_hdr.w = w; - dib_hdr.h = h; - dib_hdr.n_planes = 1; - dib_hdr.bpp = 3 == n_chans ? 24 : 32; - dib_hdr.compression_method = 3 == n_chans ? BI_RGB : BI_BITFIELDS; - dib_hdr.image_uncompressed_sz = 0; - dib_hdr.horiz_pixels_per_meter = 0; - dib_hdr.vert_pixels_per_meter = 0; - dib_hdr.n_colours_in_palette = 0; - dib_hdr.n_important_colours = 0; - // big-endian masks. only used in BI_BITFIELDS and BI_ALPHABITFIELDS ( 16 and 32-bit images ) - // important note: GIMP stores BMP data in this array order for 32-bit: [A][B][G][R] - dib_hdr.bitmask_r = 0xFF000000; - dib_hdr.bitmask_g = 0x00FF0000; - dib_hdr.bitmask_b = 0x0000FF00; - } - - uint8_t* dst_pixels_ptr = (uint8_t*)malloc( dst_pixels_padded_sz ); - if ( !dst_pixels_ptr ) { return 0; } - { - size_t dst_byte_idx = 0; - uint8_t padding[4] = {0, 0, 0, 0}; - uint8_t rgba[4] = {0, 0, 0, 0}; - uint8_t bgra[4] = {0, 0, 0, 0}; - - for ( uint32_t row = 0; row < height; row++ ) { - size_t src_byte_idx = ( height - 1 - row ) * n_chans * width; - for ( uint32_t col = 0; col < width; col++ ) { - for ( uint32_t chan = 0; chan < n_chans; chan++ ) { rgba[chan] = pixels_ptr[src_byte_idx++]; } - if ( 3 == n_chans ) { - bgra[0] = rgba[2]; - bgra[1] = rgba[1]; - bgra[2] = rgba[0]; - } else { - /* NOTE(Anton) RGBA with alpha channel would be better supported with an extended DIB header */ - bgra[0] = rgba[3]; - bgra[1] = rgba[2]; - bgra[2] = rgba[1]; - bgra[3] = rgba[0]; // alpha - } - memcpy( &dst_pixels_ptr[dst_byte_idx], bgra, n_chans ); - dst_byte_idx += (size_t)n_chans; - } // endfor col - if ( row_padding_sz > 0 ) { - memcpy( &dst_pixels_ptr[dst_byte_idx], padding, row_padding_sz ); - dst_byte_idx += row_padding_sz; - } - } // endfor row - } - { - FILE* fp = fopen( filename, "wb" ); - if ( !fp ) { - free( dst_pixels_ptr ); - return 0; - } - if ( 1 != fwrite( &file_hdr, _BMP_FILE_HDR_SZ, 1, fp ) ) { - free( dst_pixels_ptr ); - fclose( fp ); - return 0; - } - if ( 1 != fwrite( &dib_hdr, dib_hdr_sz, 1, fp ) ) { - free( dst_pixels_ptr ); - fclose( fp ); - return 0; - } - if ( 1 != fwrite( dst_pixels_ptr, dst_pixels_padded_sz, 1, fp ) ) { - free( dst_pixels_ptr ); - fclose( fp ); - return 0; - } - fclose( fp ); - } - free( dst_pixels_ptr ); - - return 1; -} |