5172
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/***************************************************************************/
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/* */
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/* pfrsbit.c */
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/* */
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/* FreeType PFR bitmap loader (body). */
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/* */
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/* Copyright 2002, 2003, 2006, 2009, 2010 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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#include "pfrsbit.h"
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#include "pfrload.h"
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_STREAM_H
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#include "pfrerror.h"
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_pfr
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** PFR BIT WRITER *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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typedef struct PFR_BitWriter_
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{
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FT_Byte* line; /* current line start */
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FT_Int pitch; /* line size in bytes */
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FT_Int width; /* width in pixels/bits */
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FT_Int rows; /* number of remaining rows to scan */
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FT_Int total; /* total number of bits to draw */
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} PFR_BitWriterRec, *PFR_BitWriter;
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static void
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pfr_bitwriter_init( PFR_BitWriter writer,
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FT_Bitmap* target,
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FT_Bool decreasing )
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{
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writer->line = target->buffer;
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writer->pitch = target->pitch;
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writer->width = target->width;
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writer->rows = target->rows;
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writer->total = writer->width * writer->rows;
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if ( !decreasing )
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{
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writer->line += writer->pitch * ( target->rows-1 );
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writer->pitch = -writer->pitch;
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}
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}
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static void
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pfr_bitwriter_decode_bytes( PFR_BitWriter writer,
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FT_Byte* p,
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FT_Byte* limit )
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{
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FT_Int n, reload;
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FT_Int left = writer->width;
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FT_Byte* cur = writer->line;
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FT_UInt mask = 0x80;
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FT_UInt val = 0;
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FT_UInt c = 0;
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n = (FT_Int)( limit - p ) * 8;
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if ( n > writer->total )
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n = writer->total;
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reload = n & 7;
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for ( ; n > 0; n-- )
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{
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if ( ( n & 7 ) == reload )
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val = *p++;
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if ( val & 0x80 )
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c |= mask;
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val <<= 1;
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mask >>= 1;
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if ( --left <= 0 )
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{
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cur[0] = (FT_Byte)c;
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left = writer->width;
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mask = 0x80;
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writer->line += writer->pitch;
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cur = writer->line;
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c = 0;
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}
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else if ( mask == 0 )
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{
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cur[0] = (FT_Byte)c;
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mask = 0x80;
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c = 0;
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cur ++;
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}
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}
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if ( mask != 0x80 )
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cur[0] = (FT_Byte)c;
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}
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static void
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pfr_bitwriter_decode_rle1( PFR_BitWriter writer,
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FT_Byte* p,
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FT_Byte* limit )
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{
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FT_Int n, phase, count, counts[2], reload;
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FT_Int left = writer->width;
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FT_Byte* cur = writer->line;
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FT_UInt mask = 0x80;
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FT_UInt c = 0;
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n = writer->total;
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phase = 1;
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counts[0] = 0;
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counts[1] = 0;
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count = 0;
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reload = 1;
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for ( ; n > 0; n-- )
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{
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if ( reload )
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{
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do
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{
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if ( phase )
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{
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FT_Int v;
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if ( p >= limit )
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break;
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v = *p++;
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counts[0] = v >> 4;
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counts[1] = v & 15;
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phase = 0;
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count = counts[0];
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}
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else
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{
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phase = 1;
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count = counts[1];
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}
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} while ( count == 0 );
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}
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if ( phase )
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c |= mask;
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mask >>= 1;
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if ( --left <= 0 )
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{
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cur[0] = (FT_Byte) c;
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left = writer->width;
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mask = 0x80;
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writer->line += writer->pitch;
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cur = writer->line;
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c = 0;
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}
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else if ( mask == 0 )
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{
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cur[0] = (FT_Byte)c;
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mask = 0x80;
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c = 0;
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cur ++;
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192 |
}
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193 |
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reload = ( --count <= 0 );
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}
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196 |
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197 |
if ( mask != 0x80 )
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198 |
cur[0] = (FT_Byte) c;
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199 |
}
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200 |
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201 |
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202 |
static void
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203 |
pfr_bitwriter_decode_rle2( PFR_BitWriter writer,
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FT_Byte* p,
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205 |
FT_Byte* limit )
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206 |
{
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207 |
FT_Int n, phase, count, reload;
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208 |
FT_Int left = writer->width;
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209 |
FT_Byte* cur = writer->line;
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210 |
FT_UInt mask = 0x80;
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211 |
FT_UInt c = 0;
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212 |
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213 |
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214 |
n = writer->total;
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215 |
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216 |
phase = 1;
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count = 0;
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218 |
reload = 1;
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219 |
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220 |
for ( ; n > 0; n-- )
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{
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222 |
if ( reload )
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{
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do
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{
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226 |
if ( p >= limit )
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227 |
break;
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count = *p++;
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230 |
phase = phase ^ 1;
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231 |
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232 |
} while ( count == 0 );
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}
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234 |
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if ( phase )
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c |= mask;
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mask >>= 1;
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if ( --left <= 0 )
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{
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cur[0] = (FT_Byte) c;
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c = 0;
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mask = 0x80;
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left = writer->width;
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writer->line += writer->pitch;
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cur = writer->line;
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}
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else if ( mask == 0 )
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{
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cur[0] = (FT_Byte)c;
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c = 0;
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mask = 0x80;
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cur ++;
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}
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reload = ( --count <= 0 );
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}
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260 |
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if ( mask != 0x80 )
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cur[0] = (FT_Byte) c;
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}
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264 |
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265 |
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266 |
/*************************************************************************/
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/*************************************************************************/
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268 |
/***** *****/
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269 |
/***** BITMAP DATA DECODING *****/
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/***** *****/
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271 |
/*************************************************************************/
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/*************************************************************************/
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273 |
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274 |
static void
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275 |
pfr_lookup_bitmap_data( FT_Byte* base,
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276 |
FT_Byte* limit,
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277 |
FT_UInt count,
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278 |
FT_UInt flags,
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279 |
FT_UInt char_code,
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280 |
FT_ULong* found_offset,
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281 |
FT_ULong* found_size )
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282 |
{
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283 |
FT_UInt left, right, char_len;
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284 |
FT_Bool two = FT_BOOL( flags & 1 );
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285 |
FT_Byte* buff;
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286 |
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287 |
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288 |
char_len = 4;
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289 |
if ( two ) char_len += 1;
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290 |
if ( flags & 2 ) char_len += 1;
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291 |
if ( flags & 4 ) char_len += 1;
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292 |
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293 |
left = 0;
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294 |
right = count;
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295 |
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296 |
while ( left < right )
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297 |
{
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298 |
FT_UInt middle, code;
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299 |
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300 |
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301 |
middle = ( left + right ) >> 1;
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302 |
buff = base + middle * char_len;
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303 |
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304 |
/* check that we are not outside of the table -- */
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305 |
/* this is possible with broken fonts... */
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306 |
if ( buff + char_len > limit )
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307 |
goto Fail;
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308 |
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309 |
if ( two )
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310 |
code = PFR_NEXT_USHORT( buff );
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311 |
else
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312 |
code = PFR_NEXT_BYTE( buff );
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313 |
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314 |
if ( code == char_code )
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315 |
goto Found_It;
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316 |
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317 |
if ( code < char_code )
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318 |
left = middle;
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319 |
else
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320 |
right = middle;
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321 |
}
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322 |
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323 |
Fail:
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324 |
/* Not found */
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325 |
*found_size = 0;
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326 |
*found_offset = 0;
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327 |
return;
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328 |
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329 |
Found_It:
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330 |
if ( flags & 2 )
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331 |
*found_size = PFR_NEXT_USHORT( buff );
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332 |
else
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333 |
*found_size = PFR_NEXT_BYTE( buff );
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334 |
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335 |
if ( flags & 4 )
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336 |
*found_offset = PFR_NEXT_ULONG( buff );
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337 |
else
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338 |
*found_offset = PFR_NEXT_USHORT( buff );
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339 |
}
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340 |
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341 |
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342 |
/* load bitmap metrics. "*padvance" must be set to the default value */
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343 |
/* before calling this function... */
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344 |
/* */
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345 |
static FT_Error
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346 |
pfr_load_bitmap_metrics( FT_Byte** pdata,
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347 |
FT_Byte* limit,
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348 |
FT_Long scaled_advance,
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349 |
FT_Long *axpos,
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350 |
FT_Long *aypos,
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351 |
FT_UInt *axsize,
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352 |
FT_UInt *aysize,
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353 |
FT_Long *aadvance,
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354 |
FT_UInt *aformat )
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|
355 |
{
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|
356 |
FT_Error error = PFR_Err_Ok;
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357 |
FT_Byte flags;
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358 |
FT_Char b;
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359 |
FT_Byte* p = *pdata;
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360 |
FT_Long xpos, ypos, advance;
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361 |
FT_UInt xsize, ysize;
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362 |
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363 |
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|
364 |
PFR_CHECK( 1 );
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365 |
flags = PFR_NEXT_BYTE( p );
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366 |
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|
367 |
xpos = 0;
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368 |
ypos = 0;
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369 |
xsize = 0;
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|
370 |
ysize = 0;
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|
371 |
advance = 0;
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372 |
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|
373 |
switch ( flags & 3 )
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|
374 |
{
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|
375 |
case 0:
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|
376 |
PFR_CHECK( 1 );
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|
377 |
b = PFR_NEXT_INT8( p );
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|
378 |
xpos = b >> 4;
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379 |
ypos = ( (FT_Char)( b << 4 ) ) >> 4;
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380 |
break;
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|
381 |
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|
382 |
case 1:
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|
383 |
PFR_CHECK( 2 );
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384 |
xpos = PFR_NEXT_INT8( p );
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|
385 |
ypos = PFR_NEXT_INT8( p );
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|
386 |
break;
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387 |
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|
388 |
case 2:
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|
389 |
PFR_CHECK( 4 );
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390 |
xpos = PFR_NEXT_SHORT( p );
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|
391 |
ypos = PFR_NEXT_SHORT( p );
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|
392 |
break;
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|
393 |
|
|
394 |
case 3:
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|
395 |
PFR_CHECK( 6 );
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|
396 |
xpos = PFR_NEXT_LONG( p );
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|
397 |
ypos = PFR_NEXT_LONG( p );
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|
398 |
break;
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|
399 |
|
|
400 |
default:
|
|
401 |
;
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|
402 |
}
|
|
403 |
|
|
404 |
flags >>= 2;
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|
405 |
switch ( flags & 3 )
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|
406 |
{
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|
407 |
case 0:
|
|
408 |
/* blank image */
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|
409 |
xsize = 0;
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|
410 |
ysize = 0;
|
|
411 |
break;
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|
412 |
|
|
413 |
case 1:
|
|
414 |
PFR_CHECK( 1 );
|
|
415 |
b = PFR_NEXT_BYTE( p );
|
|
416 |
xsize = ( b >> 4 ) & 0xF;
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|
417 |
ysize = b & 0xF;
|
|
418 |
break;
|
|
419 |
|
|
420 |
case 2:
|
|
421 |
PFR_CHECK( 2 );
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|
422 |
xsize = PFR_NEXT_BYTE( p );
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|
423 |
ysize = PFR_NEXT_BYTE( p );
|
|
424 |
break;
|
|
425 |
|
|
426 |
case 3:
|
|
427 |
PFR_CHECK( 4 );
|
|
428 |
xsize = PFR_NEXT_USHORT( p );
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|
429 |
ysize = PFR_NEXT_USHORT( p );
|
|
430 |
break;
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|
431 |
|
|
432 |
default:
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|
433 |
;
|
|
434 |
}
|
|
435 |
|
|
436 |
flags >>= 2;
|
|
437 |
switch ( flags & 3 )
|
|
438 |
{
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|
439 |
case 0:
|
|
440 |
advance = scaled_advance;
|
|
441 |
break;
|
|
442 |
|
|
443 |
case 1:
|
|
444 |
PFR_CHECK( 1 );
|
|
445 |
advance = PFR_NEXT_INT8( p ) << 8;
|
|
446 |
break;
|
|
447 |
|
|
448 |
case 2:
|
|
449 |
PFR_CHECK( 2 );
|
|
450 |
advance = PFR_NEXT_SHORT( p );
|
|
451 |
break;
|
|
452 |
|
|
453 |
case 3:
|
|
454 |
PFR_CHECK( 3 );
|
|
455 |
advance = PFR_NEXT_LONG( p );
|
|
456 |
break;
|
|
457 |
|
|
458 |
default:
|
|
459 |
;
|
|
460 |
}
|
|
461 |
|
|
462 |
*axpos = xpos;
|
|
463 |
*aypos = ypos;
|
|
464 |
*axsize = xsize;
|
|
465 |
*aysize = ysize;
|
|
466 |
*aadvance = advance;
|
|
467 |
*aformat = flags >> 2;
|
|
468 |
*pdata = p;
|
|
469 |
|
|
470 |
Exit:
|
|
471 |
return error;
|
|
472 |
|
|
473 |
Too_Short:
|
|
474 |
error = PFR_Err_Invalid_Table;
|
|
475 |
FT_ERROR(( "pfr_load_bitmap_metrics: invalid glyph data\n" ));
|
|
476 |
goto Exit;
|
|
477 |
}
|
|
478 |
|
|
479 |
|
|
480 |
static FT_Error
|
|
481 |
pfr_load_bitmap_bits( FT_Byte* p,
|
|
482 |
FT_Byte* limit,
|
|
483 |
FT_UInt format,
|
|
484 |
FT_Bool decreasing,
|
|
485 |
FT_Bitmap* target )
|
|
486 |
{
|
|
487 |
FT_Error error = PFR_Err_Ok;
|
|
488 |
PFR_BitWriterRec writer;
|
|
489 |
|
|
490 |
|
|
491 |
if ( target->rows > 0 && target->width > 0 )
|
|
492 |
{
|
|
493 |
pfr_bitwriter_init( &writer, target, decreasing );
|
|
494 |
|
|
495 |
switch ( format )
|
|
496 |
{
|
|
497 |
case 0: /* packed bits */
|
|
498 |
pfr_bitwriter_decode_bytes( &writer, p, limit );
|
|
499 |
break;
|
|
500 |
|
|
501 |
case 1: /* RLE1 */
|
|
502 |
pfr_bitwriter_decode_rle1( &writer, p, limit );
|
|
503 |
break;
|
|
504 |
|
|
505 |
case 2: /* RLE2 */
|
|
506 |
pfr_bitwriter_decode_rle2( &writer, p, limit );
|
|
507 |
break;
|
|
508 |
|
|
509 |
default:
|
|
510 |
FT_ERROR(( "pfr_read_bitmap_data: invalid image type\n" ));
|
|
511 |
error = PFR_Err_Invalid_File_Format;
|
|
512 |
}
|
|
513 |
}
|
|
514 |
|
|
515 |
return error;
|
|
516 |
}
|
|
517 |
|
|
518 |
|
|
519 |
/*************************************************************************/
|
|
520 |
/*************************************************************************/
|
|
521 |
/***** *****/
|
|
522 |
/***** BITMAP LOADING *****/
|
|
523 |
/***** *****/
|
|
524 |
/*************************************************************************/
|
|
525 |
/*************************************************************************/
|
|
526 |
|
|
527 |
FT_LOCAL( FT_Error )
|
|
528 |
pfr_slot_load_bitmap( PFR_Slot glyph,
|
|
529 |
PFR_Size size,
|
|
530 |
FT_UInt glyph_index )
|
|
531 |
{
|
|
532 |
FT_Error error;
|
|
533 |
PFR_Face face = (PFR_Face) glyph->root.face;
|
|
534 |
FT_Stream stream = face->root.stream;
|
|
535 |
PFR_PhyFont phys = &face->phy_font;
|
|
536 |
FT_ULong gps_offset;
|
|
537 |
FT_ULong gps_size;
|
|
538 |
PFR_Char character;
|
|
539 |
PFR_Strike strike;
|
|
540 |
|
|
541 |
|
|
542 |
character = &phys->chars[glyph_index];
|
|
543 |
|
|
544 |
/* Look-up a bitmap strike corresponding to the current */
|
|
545 |
/* character dimensions */
|
|
546 |
{
|
|
547 |
FT_UInt n;
|
|
548 |
|
|
549 |
|
|
550 |
strike = phys->strikes;
|
|
551 |
for ( n = 0; n < phys->num_strikes; n++ )
|
|
552 |
{
|
|
553 |
if ( strike->x_ppm == (FT_UInt)size->root.metrics.x_ppem &&
|
|
554 |
strike->y_ppm == (FT_UInt)size->root.metrics.y_ppem )
|
|
555 |
{
|
|
556 |
goto Found_Strike;
|
|
557 |
}
|
|
558 |
|
|
559 |
strike++;
|
|
560 |
}
|
|
561 |
|
|
562 |
/* couldn't find it */
|
|
563 |
return PFR_Err_Invalid_Argument;
|
|
564 |
}
|
|
565 |
|
|
566 |
Found_Strike:
|
|
567 |
|
|
568 |
/* Now lookup the glyph's position within the file */
|
|
569 |
{
|
|
570 |
FT_UInt char_len;
|
|
571 |
|
|
572 |
|
|
573 |
char_len = 4;
|
|
574 |
if ( strike->flags & 1 ) char_len += 1;
|
|
575 |
if ( strike->flags & 2 ) char_len += 1;
|
|
576 |
if ( strike->flags & 4 ) char_len += 1;
|
|
577 |
|
|
578 |
/* Access data directly in the frame to speed lookups */
|
|
579 |
if ( FT_STREAM_SEEK( phys->bct_offset + strike->bct_offset ) ||
|
|
580 |
FT_FRAME_ENTER( char_len * strike->num_bitmaps ) )
|
|
581 |
goto Exit;
|
|
582 |
|
|
583 |
pfr_lookup_bitmap_data( stream->cursor,
|
|
584 |
stream->limit,
|
|
585 |
strike->num_bitmaps,
|
|
586 |
strike->flags,
|
|
587 |
character->char_code,
|
|
588 |
&gps_offset,
|
|
589 |
&gps_size );
|
|
590 |
|
|
591 |
FT_FRAME_EXIT();
|
|
592 |
|
|
593 |
if ( gps_size == 0 )
|
|
594 |
{
|
|
595 |
/* Could not find a bitmap program string for this glyph */
|
|
596 |
error = PFR_Err_Invalid_Argument;
|
|
597 |
goto Exit;
|
|
598 |
}
|
|
599 |
}
|
|
600 |
|
|
601 |
/* get the bitmap metrics */
|
|
602 |
{
|
|
603 |
FT_Long xpos = 0, ypos = 0, advance = 0;
|
|
604 |
FT_UInt xsize = 0, ysize = 0, format = 0;
|
|
605 |
FT_Byte* p;
|
|
606 |
|
|
607 |
|
|
608 |
/* compute linear advance */
|
|
609 |
advance = character->advance;
|
|
610 |
if ( phys->metrics_resolution != phys->outline_resolution )
|
|
611 |
advance = FT_MulDiv( advance,
|
|
612 |
phys->outline_resolution,
|
|
613 |
phys->metrics_resolution );
|
|
614 |
|
|
615 |
glyph->root.linearHoriAdvance = advance;
|
|
616 |
|
|
617 |
/* compute default advance, i.e., scaled advance. This can be */
|
|
618 |
/* overridden in the bitmap header of certain glyphs. */
|
|
619 |
advance = FT_MulDiv( (FT_Fixed)size->root.metrics.x_ppem << 8,
|
|
620 |
character->advance,
|
|
621 |
phys->metrics_resolution );
|
|
622 |
|
|
623 |
if ( FT_STREAM_SEEK( face->header.gps_section_offset + gps_offset ) ||
|
|
624 |
FT_FRAME_ENTER( gps_size ) )
|
|
625 |
goto Exit;
|
|
626 |
|
|
627 |
p = stream->cursor;
|
|
628 |
error = pfr_load_bitmap_metrics( &p, stream->limit,
|
|
629 |
advance,
|
|
630 |
&xpos, &ypos,
|
|
631 |
&xsize, &ysize,
|
|
632 |
&advance, &format );
|
|
633 |
|
|
634 |
/*
|
|
635 |
* XXX: on 16bit system, we return an error for huge bitmap
|
|
636 |
* which causes a size truncation, because truncated
|
|
637 |
* size properties makes bitmap glyph broken.
|
|
638 |
*/
|
|
639 |
if ( xpos > FT_INT_MAX || ( ypos + ysize ) > FT_INT_MAX )
|
|
640 |
{
|
|
641 |
FT_TRACE1(( "pfr_slot_load_bitmap:" ));
|
|
642 |
FT_TRACE1(( "huge bitmap glyph %dx%d over FT_GlyphSlot\n",
|
|
643 |
xpos, ypos ));
|
|
644 |
error = PFR_Err_Invalid_Pixel_Size;
|
|
645 |
}
|
|
646 |
|
|
647 |
if ( !error )
|
|
648 |
{
|
|
649 |
glyph->root.format = FT_GLYPH_FORMAT_BITMAP;
|
|
650 |
|
|
651 |
/* Set up glyph bitmap and metrics */
|
|
652 |
|
|
653 |
/* XXX: needs casts to fit FT_Bitmap.{width|rows|pitch} */
|
|
654 |
glyph->root.bitmap.width = (FT_Int)xsize;
|
|
655 |
glyph->root.bitmap.rows = (FT_Int)ysize;
|
|
656 |
glyph->root.bitmap.pitch = (FT_Int)( xsize + 7 ) >> 3;
|
|
657 |
glyph->root.bitmap.pixel_mode = FT_PIXEL_MODE_MONO;
|
|
658 |
|
|
659 |
/* XXX: needs casts to fit FT_Glyph_Metrics.{width|height} */
|
|
660 |
glyph->root.metrics.width = (FT_Pos)xsize << 6;
|
|
661 |
glyph->root.metrics.height = (FT_Pos)ysize << 6;
|
|
662 |
glyph->root.metrics.horiBearingX = xpos << 6;
|
|
663 |
glyph->root.metrics.horiBearingY = ypos << 6;
|
|
664 |
glyph->root.metrics.horiAdvance = FT_PIX_ROUND( ( advance >> 2 ) );
|
|
665 |
glyph->root.metrics.vertBearingX = - glyph->root.metrics.width >> 1;
|
|
666 |
glyph->root.metrics.vertBearingY = 0;
|
|
667 |
glyph->root.metrics.vertAdvance = size->root.metrics.height;
|
|
668 |
|
|
669 |
/* XXX: needs casts fit FT_GlyphSlotRec.bitmap_{left|top} */
|
|
670 |
glyph->root.bitmap_left = (FT_Int)xpos;
|
|
671 |
glyph->root.bitmap_top = (FT_Int)(ypos + ysize);
|
|
672 |
|
|
673 |
/* Allocate and read bitmap data */
|
|
674 |
{
|
|
675 |
FT_ULong len = glyph->root.bitmap.pitch * ysize;
|
|
676 |
|
|
677 |
|
|
678 |
error = ft_glyphslot_alloc_bitmap( &glyph->root, len );
|
|
679 |
if ( !error )
|
|
680 |
{
|
|
681 |
error = pfr_load_bitmap_bits(
|
|
682 |
p,
|
|
683 |
stream->limit,
|
|
684 |
format,
|
|
685 |
FT_BOOL(face->header.color_flags & 2),
|
|
686 |
&glyph->root.bitmap );
|
|
687 |
}
|
|
688 |
}
|
|
689 |
}
|
|
690 |
|
|
691 |
FT_FRAME_EXIT();
|
|
692 |
}
|
|
693 |
|
|
694 |
Exit:
|
|
695 |
return error;
|
|
696 |
}
|
|
697 |
|
|
698 |
/* END */
|