forked from minhngoc25a/freetype2
287 lines
14 KiB
C
287 lines
14 KiB
C
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/***************************************************************************/
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/* */
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/* ftoutln.c */
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/* */
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/* FreeType outline management (body). */
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/* */
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/* Copyright 1996-1999 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used */
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/* modified and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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/*************************************************************************/
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/* */
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/* All functions are declared in freetype.h. */
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/* */
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/*************************************************************************/
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#include <freetype.h>
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#include <ftconfig.h>
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#include <ftobjs.h>
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#include <ftimage.h>
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#include <ftoutln.h>
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Copy_Outline */
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/* */
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/* <Description> */
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/* Copies an outline into another one. Both objects must have the */
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/* same sizes (number of points & number of contours) when this */
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/* function is called. */
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/* */
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/* <Input> */
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/* source :: A handle to the source outline. */
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/* target :: A handle to the target outline. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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BASE_FUNC
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FT_Error FT_Copy_Outline( FT_Outline* source,
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FT_Outline* target )
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{
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if ( !source || !target ||
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source->n_points != target->n_points ||
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source->n_contours != target->n_contours )
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return FT_Err_Invalid_Argument;
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MEM_Copy( target->points, source->points,
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source->n_points * 2 * sizeof ( FT_Pos ) );
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MEM_Copy( target->flags, source->flags,
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source->n_points * sizeof ( FT_Byte ) );
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MEM_Copy( target->contours, source->contours,
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source->n_contours * sizeof ( FT_Short ) );
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target->high_precision = source->high_precision;
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target->second_pass = target->second_pass;
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target->dropout_mode = source->dropout_mode;
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return FT_Err_Ok;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Get_Outline_Bitmap */
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/* */
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/* <Description> */
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/* Renders an outline within a bitmap. The outline's image is simply */
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/* or-ed to the target bitmap. */
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/* */
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/* */
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/* <Input> */
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/* library :: A handle to a FreeType library object. */
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/* outline :: A pointer to the source outline descriptor. */
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/* map :: A pointer to the target bitmap descriptor. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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/* <MT-Note> */
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/* YES. Rendering is synchronized, so that concurrent calls to the */
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/* scan-line converter will be serialized. */
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/* */
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/* <Note> */
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/* This function does NOT CREATE the bitmap, it only renders an */
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/* outline image within the one you pass to it! */
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/* */
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/* It will use the raster correponding to the default glyph format. */
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/* */
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BASE_FUNC
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FT_Error FT_Get_Outline_Bitmap( FT_Library library,
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FT_Outline* outline,
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FT_Bitmap* map )
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{
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FT_Error error;
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FT_Glyph_Format* format;
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error = FT_Err_Invalid_Glyph_Format;
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format = FT_Get_Glyph_Format( library, ft_glyph_format_outline );
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if (!format) goto Exit;
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error = FT_Err_Invalid_Glyph_Format;
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if (!format->raster) goto Exit;
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error = format->raster_interface->render( format->raster, outline, map );
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Exit:
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return error;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Transform_Outline */
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/* */
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/* <Description> */
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/* Applies a simple 2x2 matrix to all of an outline's points. Useful */
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/* for applying rotations, slanting, flipping, etc. */
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/* */
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/* <Input> */
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/* outline :: A pointer to the target outline descriptor. */
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/* matrix :: A pointer to the transformation matrix. */
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/* */
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/* <MT-Note> */
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/* Yes. */
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/* */
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/* <Note> */
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/* You can use FT_Translate_Outline() if you need to translate the */
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/* outline's points. */
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/* */
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BASE_FUNC
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void FT_Transform_Outline( FT_Outline* outline,
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FT_Matrix* matrix )
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{
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FT_UShort n;
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FT_Vector* vec;
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vec = outline->points;
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for ( n = 0; n < outline->n_points; n++ )
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{
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FT_Pos x, y;
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x = FT_MulFix( vec->x, matrix->xx ) +
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FT_MulFix( vec->y, matrix->xy );
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y = FT_MulFix( vec->x, matrix->yx ) +
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FT_MulFix( vec->y, matrix->yy );
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vec->x = x;
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vec->y = y;
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vec++;
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}
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Transform_Vector */
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/* */
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/* <Description> */
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/* Transforms a single vector through a 2x2 matrix. */
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/* */
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/* <InOut> */
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/* x :: The horizontal vector coordinate. */
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/* y :: The vertical vector coordinate. */
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/* */
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/* <Input> */
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/* matrix :: A pointer to the source 2x2 matrix. */
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/* */
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/* <MT-Note> */
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/* Yes. */
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/* */
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BASE_FUNC
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void FT_Transform_Vector( FT_Pos* x,
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FT_Pos* y,
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FT_Matrix* matrix )
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{
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FT_Pos xz, yz;
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xz = FT_MulFix( *x, matrix->xx ) +
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FT_MulFix( *y, matrix->xy );
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yz = FT_MulFix( *x, matrix->yx ) +
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FT_MulFix( *y, matrix->yy );
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*x = xz;
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*y = yz;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Matrix_Multiply */
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/* */
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/* <Description> */
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/* Performs the matrix operation `b = a*b'. */
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/* */
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/* <Input> */
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/* a :: A pointer to matrix `a'. */
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/* */
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/* <InOut> */
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/* b :: A pointer to matrix `b'. */
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/* */
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/* <MT-Note> */
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/* Yes. */
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/* */
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BASE_FUNC
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void FT_Matrix_Multiply( FT_Matrix* a,
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FT_Matrix* b )
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{
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FT_Fixed xx, xy, yx, yy;
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xx = FT_MulFix( a->xx, b->xx ) + FT_MulFix( a->xy, b->yx );
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xy = FT_MulFix( a->xx, b->xy ) + FT_MulFix( a->xy, b->yy );
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yx = FT_MulFix( a->yx, b->xx ) + FT_MulFix( a->yy, b->yx );
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yy = FT_MulFix( a->yx, b->xy ) + FT_MulFix( a->yy, b->yy );
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b->xx = xx; b->xy = xy;
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b->yx = yx; b->yy = yy;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Matrix_Invert */
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/* */
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/* <Description> */
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/* Inverts a 2x2 matrix. Returns an error if it can't be inverted. */
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/* */
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/* <InOut> */
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/* matrix :: A pointer to the target matrix. Remains untouched in */
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/* case of error. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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/* <MT-Note> */
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/* Yes. */
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/* */
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BASE_FUNC
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FT_Error FT_Matrix_Invert( FT_Matrix* matrix )
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{
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FT_Pos delta, xx, yy;
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/* compute discriminant */
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delta = FT_MulFix( matrix->xx, matrix->yy ) -
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FT_MulFix( matrix->xy, matrix->yx );
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if ( !delta )
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return FT_Err_Invalid_Argument; /* matrix can't be inverted */
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matrix->xy = - FT_DivFix( matrix->xy, delta );
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matrix->yx = - FT_DivFix( matrix->yx, delta );
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xx = matrix->xx;
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yy = matrix->yy;
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matrix->xx = FT_DivFix( yy, delta );
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matrix->yy = FT_DivFix( xx, delta );
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return FT_Err_Ok;
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}
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/* END */
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