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-rw-r--r--third_party/freetype/src/sfnt/pngshim.c378
1 files changed, 0 insertions, 378 deletions
diff --git a/third_party/freetype/src/sfnt/pngshim.c b/third_party/freetype/src/sfnt/pngshim.c
deleted file mode 100644
index ea60452635..0000000000
--- a/third_party/freetype/src/sfnt/pngshim.c
+++ /dev/null
@@ -1,378 +0,0 @@
-/***************************************************************************/
-/* */
-/* pngshim.c */
-/* */
-/* PNG Bitmap glyph support. */
-/* */
-/* Copyright 2013-2015 by */
-/* Google, Inc. */
-/* Written by Stuart Gill and Behdad Esfahbod. */
-/* */
-/* This file is part of the FreeType project, and may only be used, */
-/* modified, and distributed under the terms of the FreeType project */
-/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
-/* this file you indicate that you have read the license and */
-/* understand and accept it fully. */
-/* */
-/***************************************************************************/
-
-
-#include <ft2build.h>
-#include FT_INTERNAL_DEBUG_H
-#include FT_INTERNAL_STREAM_H
-#include FT_TRUETYPE_TAGS_H
-#include FT_CONFIG_STANDARD_LIBRARY_H
-
-
-#ifdef FT_CONFIG_OPTION_USE_PNG
-
- /* We always include <stjmp.h>, so make libpng shut up! */
-#define PNG_SKIP_SETJMP_CHECK 1
-#include <png.h>
-#include "pngshim.h"
-
-#include "sferrors.h"
-
-
- /* This code is freely based on cairo-png.c. There's so many ways */
- /* to call libpng, and the way cairo does it is defacto standard. */
-
- static unsigned int
- multiply_alpha( unsigned int alpha,
- unsigned int color )
- {
- unsigned int temp = alpha * color + 0x80;
-
-
- return ( temp + ( temp >> 8 ) ) >> 8;
- }
-
-
- /* Premultiplies data and converts RGBA bytes => native endian. */
- static void
- premultiply_data( png_structp png,
- png_row_infop row_info,
- png_bytep data )
- {
- unsigned int i;
-
- FT_UNUSED( png );
-
-
- for ( i = 0; i < row_info->rowbytes; i += 4 )
- {
- unsigned char* base = &data[i];
- unsigned int alpha = base[3];
-
-
- if ( alpha == 0 )
- base[0] = base[1] = base[2] = base[3] = 0;
-
- else
- {
- unsigned int red = base[0];
- unsigned int green = base[1];
- unsigned int blue = base[2];
-
-
- if ( alpha != 0xFF )
- {
- red = multiply_alpha( alpha, red );
- green = multiply_alpha( alpha, green );
- blue = multiply_alpha( alpha, blue );
- }
-
- base[0] = (unsigned char)blue;
- base[1] = (unsigned char)green;
- base[2] = (unsigned char)red;
- base[3] = (unsigned char)alpha;
- }
- }
- }
-
-
- /* Converts RGBx bytes to BGRA. */
- static void
- convert_bytes_to_data( png_structp png,
- png_row_infop row_info,
- png_bytep data )
- {
- unsigned int i;
-
- FT_UNUSED( png );
-
-
- for ( i = 0; i < row_info->rowbytes; i += 4 )
- {
- unsigned char* base = &data[i];
- unsigned int red = base[0];
- unsigned int green = base[1];
- unsigned int blue = base[2];
-
-
- base[0] = (unsigned char)blue;
- base[1] = (unsigned char)green;
- base[2] = (unsigned char)red;
- base[3] = 0xFF;
- }
- }
-
-
- /* Use error callback to avoid png writing to stderr. */
- static void
- error_callback( png_structp png,
- png_const_charp error_msg )
- {
- FT_Error* error = (FT_Error*)png_get_error_ptr( png );
-
- FT_UNUSED( error_msg );
-
-
- *error = FT_THROW( Out_Of_Memory );
-#ifdef PNG_SETJMP_SUPPORTED
- ft_longjmp( png_jmpbuf( png ), 1 );
-#endif
- /* if we get here, then we have no choice but to abort ... */
- }
-
-
- /* Use warning callback to avoid png writing to stderr. */
- static void
- warning_callback( png_structp png,
- png_const_charp error_msg )
- {
- FT_UNUSED( png );
- FT_UNUSED( error_msg );
-
- /* Just ignore warnings. */
- }
-
-
- static void
- read_data_from_FT_Stream( png_structp png,
- png_bytep data,
- png_size_t length )
- {
- FT_Error error;
- png_voidp p = png_get_io_ptr( png );
- FT_Stream stream = (FT_Stream)p;
-
-
- if ( FT_FRAME_ENTER( length ) )
- {
- FT_Error* e = (FT_Error*)png_get_error_ptr( png );
-
-
- *e = FT_THROW( Invalid_Stream_Read );
- png_error( png, NULL );
-
- return;
- }
-
- memcpy( data, stream->cursor, length );
-
- FT_FRAME_EXIT();
- }
-
-
- FT_LOCAL_DEF( FT_Error )
- Load_SBit_Png( FT_GlyphSlot slot,
- FT_Int x_offset,
- FT_Int y_offset,
- FT_Int pix_bits,
- TT_SBit_Metrics metrics,
- FT_Memory memory,
- FT_Byte* data,
- FT_UInt png_len,
- FT_Bool populate_map_and_metrics )
- {
- FT_Bitmap *map = &slot->bitmap;
- FT_Error error = FT_Err_Ok;
- FT_StreamRec stream;
-
- png_structp png;
- png_infop info;
- png_uint_32 imgWidth, imgHeight;
-
- int bitdepth, color_type, interlace;
- FT_Int i;
- png_byte* *rows = NULL; /* pacify compiler */
-
-
- if ( x_offset < 0 ||
- y_offset < 0 )
- {
- error = FT_THROW( Invalid_Argument );
- goto Exit;
- }
-
- if ( !populate_map_and_metrics &&
- ( (FT_UInt)x_offset + metrics->width > map->width ||
- (FT_UInt)y_offset + metrics->height > map->rows ||
- pix_bits != 32 ||
- map->pixel_mode != FT_PIXEL_MODE_BGRA ) )
- {
- error = FT_THROW( Invalid_Argument );
- goto Exit;
- }
-
- FT_Stream_OpenMemory( &stream, data, png_len );
-
- png = png_create_read_struct( PNG_LIBPNG_VER_STRING,
- &error,
- error_callback,
- warning_callback );
- if ( !png )
- {
- error = FT_THROW( Out_Of_Memory );
- goto Exit;
- }
-
- info = png_create_info_struct( png );
- if ( !info )
- {
- error = FT_THROW( Out_Of_Memory );
- png_destroy_read_struct( &png, NULL, NULL );
- goto Exit;
- }
-
- if ( ft_setjmp( png_jmpbuf( png ) ) )
- {
- error = FT_THROW( Invalid_File_Format );
- goto DestroyExit;
- }
-
- png_set_read_fn( png, &stream, read_data_from_FT_Stream );
-
- png_read_info( png, info );
- png_get_IHDR( png, info,
- &imgWidth, &imgHeight,
- &bitdepth, &color_type, &interlace,
- NULL, NULL );
-
- if ( error ||
- ( !populate_map_and_metrics &&
- ( (FT_Int)imgWidth != metrics->width ||
- (FT_Int)imgHeight != metrics->height ) ) )
- goto DestroyExit;
-
- if ( populate_map_and_metrics )
- {
- FT_ULong size;
-
-
- metrics->width = (FT_UShort)imgWidth;
- metrics->height = (FT_UShort)imgHeight;
-
- map->width = metrics->width;
- map->rows = metrics->height;
- map->pixel_mode = FT_PIXEL_MODE_BGRA;
- map->pitch = (int)( map->width * 4 );
- map->num_grays = 256;
-
- /* reject too large bitmaps similarly to the rasterizer */
- if ( map->rows > 0x7FFF || map->width > 0x7FFF )
- {
- error = FT_THROW( Array_Too_Large );
- goto DestroyExit;
- }
-
- /* this doesn't overflow: 0x7FFF * 0x7FFF * 4 < 2^32 */
- size = map->rows * (FT_ULong)map->pitch;
-
- error = ft_glyphslot_alloc_bitmap( slot, size );
- if ( error )
- goto DestroyExit;
- }
-
- /* convert palette/gray image to rgb */
- if ( color_type == PNG_COLOR_TYPE_PALETTE )
- png_set_palette_to_rgb( png );
-
- /* expand gray bit depth if needed */
- if ( color_type == PNG_COLOR_TYPE_GRAY )
- {
-#if PNG_LIBPNG_VER >= 10209
- png_set_expand_gray_1_2_4_to_8( png );
-#else
- png_set_gray_1_2_4_to_8( png );
-#endif
- }
-
- /* transform transparency to alpha */
- if ( png_get_valid(png, info, PNG_INFO_tRNS ) )
- png_set_tRNS_to_alpha( png );
-
- if ( bitdepth == 16 )
- png_set_strip_16( png );
-
- if ( bitdepth < 8 )
- png_set_packing( png );
-
- /* convert grayscale to RGB */
- if ( color_type == PNG_COLOR_TYPE_GRAY ||
- color_type == PNG_COLOR_TYPE_GRAY_ALPHA )
- png_set_gray_to_rgb( png );
-
- if ( interlace != PNG_INTERLACE_NONE )
- png_set_interlace_handling( png );
-
- png_set_filler( png, 0xFF, PNG_FILLER_AFTER );
-
- /* recheck header after setting EXPAND options */
- png_read_update_info(png, info );
- png_get_IHDR( png, info,
- &imgWidth, &imgHeight,
- &bitdepth, &color_type, &interlace,
- NULL, NULL );
-
- if ( bitdepth != 8 ||
- !( color_type == PNG_COLOR_TYPE_RGB ||
- color_type == PNG_COLOR_TYPE_RGB_ALPHA ) )
- {
- error = FT_THROW( Invalid_File_Format );
- goto DestroyExit;
- }
-
- switch ( color_type )
- {
- default:
- /* Shouldn't happen, but fall through. */
-
- case PNG_COLOR_TYPE_RGB_ALPHA:
- png_set_read_user_transform_fn( png, premultiply_data );
- break;
-
- case PNG_COLOR_TYPE_RGB:
- /* Humm, this smells. Carry on though. */
- png_set_read_user_transform_fn( png, convert_bytes_to_data );
- break;
- }
-
- if ( FT_NEW_ARRAY( rows, imgHeight ) )
- {
- error = FT_THROW( Out_Of_Memory );
- goto DestroyExit;
- }
-
- for ( i = 0; i < (FT_Int)imgHeight; i++ )
- rows[i] = map->buffer + ( y_offset + i ) * map->pitch + x_offset * 4;
-
- png_read_image( png, rows );
-
- FT_FREE( rows );
-
- png_read_end( png, info );
-
- DestroyExit:
- png_destroy_read_struct( &png, &info, NULL );
- FT_Stream_Close( &stream );
-
- Exit:
- return error;
- }
-
-#endif /* FT_CONFIG_OPTION_USE_PNG */
-
-
-/* END */
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