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| 1 /***************************************************************************/ |
| 2 /* */ |
| 3 /* cf2stack.c */ |
| 4 /* */ |
| 5 /* Adobe's code for emulating a CFF stack (body). */ |
| 6 /* */ |
| 7 /* Copyright 2007-2013 Adobe Systems Incorporated. */ |
| 8 /* */ |
| 9 /* This software, and all works of authorship, whether in source or */ |
| 10 /* object code form as indicated by the copyright notice(s) included */ |
| 11 /* herein (collectively, the "Work") is made available, and may only be */ |
| 12 /* used, modified, and distributed under the FreeType Project License, */ |
| 13 /* LICENSE.TXT. Additionally, subject to the terms and conditions of the */ |
| 14 /* FreeType Project License, each contributor to the Work hereby grants */ |
| 15 /* to any individual or legal entity exercising permissions granted by */ |
| 16 /* the FreeType Project License and this section (hereafter, "You" or */ |
| 17 /* "Your") a perpetual, worldwide, non-exclusive, no-charge, */ |
| 18 /* royalty-free, irrevocable (except as stated in this section) patent */ |
| 19 /* license to make, have made, use, offer to sell, sell, import, and */ |
| 20 /* otherwise transfer the Work, where such license applies only to those */ |
| 21 /* patent claims licensable by such contributor that are necessarily */ |
| 22 /* infringed by their contribution(s) alone or by combination of their */ |
| 23 /* contribution(s) with the Work to which such contribution(s) was */ |
| 24 /* submitted. If You institute patent litigation against any entity */ |
| 25 /* (including a cross-claim or counterclaim in a lawsuit) alleging that */ |
| 26 /* the Work or a contribution incorporated within the Work constitutes */ |
| 27 /* direct or contributory patent infringement, then any patent licenses */ |
| 28 /* granted to You under this License for that Work shall terminate as of */ |
| 29 /* the date such litigation is filed. */ |
| 30 /* */ |
| 31 /* By using, modifying, or distributing the Work you indicate that you */ |
| 32 /* have read and understood the terms and conditions of the */ |
| 33 /* FreeType Project License as well as those provided in this section, */ |
| 34 /* and you accept them fully. */ |
| 35 /* */ |
| 36 /***************************************************************************/ |
| 37 |
| 38 |
| 39 #include "cf2ft.h" |
| 40 #include FT_INTERNAL_DEBUG_H |
| 41 |
| 42 #include "cf2glue.h" |
| 43 #include "cf2font.h" |
| 44 #include "cf2stack.h" |
| 45 |
| 46 #include "cf2error.h" |
| 47 |
| 48 |
| 49 /* Allocate and initialize an instance of CF2_Stack. */ |
| 50 /* Note: This function returns NULL on error (does not set */ |
| 51 /* `error'). */ |
| 52 FT_LOCAL_DEF( CF2_Stack ) |
| 53 cf2_stack_init( FT_Memory memory, |
| 54 FT_Error* e ) |
| 55 { |
| 56 FT_Error error = FT_Err_Ok; /* for FT_QNEW */ |
| 57 |
| 58 CF2_Stack stack = NULL; |
| 59 |
| 60 |
| 61 if ( !FT_QNEW( stack ) ) |
| 62 { |
| 63 /* initialize the structure; FT_QNEW zeroes it */ |
| 64 stack->memory = memory; |
| 65 stack->error = e; |
| 66 stack->top = &stack->buffer[0]; /* empty stack */ |
| 67 } |
| 68 |
| 69 return stack; |
| 70 } |
| 71 |
| 72 |
| 73 FT_LOCAL_DEF( void ) |
| 74 cf2_stack_free( CF2_Stack stack ) |
| 75 { |
| 76 if ( stack ) |
| 77 { |
| 78 FT_Memory memory = stack->memory; |
| 79 |
| 80 |
| 81 /* free the main structure */ |
| 82 FT_FREE( stack ); |
| 83 } |
| 84 } |
| 85 |
| 86 |
| 87 FT_LOCAL_DEF( CF2_UInt ) |
| 88 cf2_stack_count( CF2_Stack stack ) |
| 89 { |
| 90 return (CF2_UInt)( stack->top - &stack->buffer[0] ); |
| 91 } |
| 92 |
| 93 |
| 94 FT_LOCAL_DEF( void ) |
| 95 cf2_stack_pushInt( CF2_Stack stack, |
| 96 CF2_Int val ) |
| 97 { |
| 98 if ( stack->top == &stack->buffer[CF2_OPERAND_STACK_SIZE] ) |
| 99 { |
| 100 CF2_SET_ERROR( stack->error, Stack_Overflow ); |
| 101 return; /* stack overflow */ |
| 102 } |
| 103 |
| 104 stack->top->u.i = val; |
| 105 stack->top->type = CF2_NumberInt; |
| 106 ++stack->top; |
| 107 } |
| 108 |
| 109 |
| 110 FT_LOCAL_DEF( void ) |
| 111 cf2_stack_pushFixed( CF2_Stack stack, |
| 112 CF2_Fixed val ) |
| 113 { |
| 114 if ( stack->top == &stack->buffer[CF2_OPERAND_STACK_SIZE] ) |
| 115 { |
| 116 CF2_SET_ERROR( stack->error, Stack_Overflow ); |
| 117 return; /* stack overflow */ |
| 118 } |
| 119 |
| 120 stack->top->u.r = val; |
| 121 stack->top->type = CF2_NumberFixed; |
| 122 ++stack->top; |
| 123 } |
| 124 |
| 125 |
| 126 /* this function is only allowed to pop an integer type */ |
| 127 FT_LOCAL_DEF( CF2_Int ) |
| 128 cf2_stack_popInt( CF2_Stack stack ) |
| 129 { |
| 130 if ( stack->top == &stack->buffer[0] ) |
| 131 { |
| 132 CF2_SET_ERROR( stack->error, Stack_Underflow ); |
| 133 return 0; /* underflow */ |
| 134 } |
| 135 if ( stack->top[-1].type != CF2_NumberInt ) |
| 136 { |
| 137 CF2_SET_ERROR( stack->error, Syntax_Error ); |
| 138 return 0; /* type mismatch */ |
| 139 } |
| 140 |
| 141 --stack->top; |
| 142 |
| 143 return stack->top->u.i; |
| 144 } |
| 145 |
| 146 |
| 147 /* Note: type mismatch is silently cast */ |
| 148 /* TODO: check this */ |
| 149 FT_LOCAL_DEF( CF2_Fixed ) |
| 150 cf2_stack_popFixed( CF2_Stack stack ) |
| 151 { |
| 152 if ( stack->top == &stack->buffer[0] ) |
| 153 { |
| 154 CF2_SET_ERROR( stack->error, Stack_Underflow ); |
| 155 return cf2_intToFixed( 0 ); /* underflow */ |
| 156 } |
| 157 |
| 158 --stack->top; |
| 159 |
| 160 switch ( stack->top->type ) |
| 161 { |
| 162 case CF2_NumberInt: |
| 163 return cf2_intToFixed( stack->top->u.i ); |
| 164 case CF2_NumberFrac: |
| 165 return cf2_fracToFixed( stack->top->u.f ); |
| 166 default: |
| 167 return stack->top->u.r; |
| 168 } |
| 169 } |
| 170 |
| 171 |
| 172 /* Note: type mismatch is silently cast */ |
| 173 /* TODO: check this */ |
| 174 FT_LOCAL_DEF( CF2_Fixed ) |
| 175 cf2_stack_getReal( CF2_Stack stack, |
| 176 CF2_UInt idx ) |
| 177 { |
| 178 FT_ASSERT( cf2_stack_count( stack ) <= CF2_OPERAND_STACK_SIZE ); |
| 179 |
| 180 if ( idx >= cf2_stack_count( stack ) ) |
| 181 { |
| 182 CF2_SET_ERROR( stack->error, Stack_Overflow ); |
| 183 return cf2_intToFixed( 0 ); /* bounds error */ |
| 184 } |
| 185 |
| 186 switch ( stack->buffer[idx].type ) |
| 187 { |
| 188 case CF2_NumberInt: |
| 189 return cf2_intToFixed( stack->buffer[idx].u.i ); |
| 190 case CF2_NumberFrac: |
| 191 return cf2_fracToFixed( stack->buffer[idx].u.f ); |
| 192 default: |
| 193 return stack->buffer[idx].u.r; |
| 194 } |
| 195 } |
| 196 |
| 197 |
| 198 FT_LOCAL_DEF( void ) |
| 199 cf2_stack_clear( CF2_Stack stack ) |
| 200 { |
| 201 stack->top = &stack->buffer[0]; |
| 202 } |
| 203 |
| 204 |
| 205 /* END */ |
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