| File: | bitmap/fontink.c |
| Location: | line 142, column 18 |
| Description: | Dereference of null pointer |
| 1 | /* | |||
| 2 | ||||
| 3 | Copyright 1990, 1998 The Open Group | |||
| 4 | ||||
| 5 | Permission to use, copy, modify, distribute, and sell this software and its | |||
| 6 | documentation for any purpose is hereby granted without fee, provided that | |||
| 7 | the above copyright notice appear in all copies and that both that | |||
| 8 | copyright notice and this permission notice appear in supporting | |||
| 9 | documentation. | |||
| 10 | ||||
| 11 | The above copyright notice and this permission notice shall be included | |||
| 12 | in all copies or substantial portions of the Software. | |||
| 13 | ||||
| 14 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |||
| 15 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |||
| 16 | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | |||
| 17 | IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR | |||
| 18 | OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |||
| 19 | ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |||
| 20 | OTHER DEALINGS IN THE SOFTWARE. | |||
| 21 | ||||
| 22 | Except as contained in this notice, the name of The Open Group shall | |||
| 23 | not be used in advertising or otherwise to promote the sale, use or | |||
| 24 | other dealings in this Software without prior written authorization | |||
| 25 | from The Open Group. | |||
| 26 | ||||
| 27 | */ | |||
| 28 | ||||
| 29 | /* | |||
| 30 | * Author: Keith Packard, MIT X Consortium | |||
| 31 | */ | |||
| 32 | ||||
| 33 | #ifdef HAVE_CONFIG_H1 | |||
| 34 | #include <config.h> | |||
| 35 | #endif | |||
| 36 | ||||
| 37 | #include <X11/fonts/fntfilst.h> | |||
| 38 | #include <X11/fonts/bitmap.h> | |||
| 39 | #include <X11/fonts/bdfint.h> | |||
| 40 | ||||
| 41 | static unsigned char ink_mask_msb[8] = { | |||
| 42 | 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01, | |||
| 43 | }; | |||
| 44 | ||||
| 45 | static unsigned char ink_mask_lsb[8] = { | |||
| 46 | 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, | |||
| 47 | }; | |||
| 48 | ||||
| 49 | void | |||
| 50 | FontCharInkMetrics(FontPtr pFont, CharInfoPtr pCI, xCharInfo *pInk) | |||
| 51 | { | |||
| 52 | int leftBearing, | |||
| 53 | ascent, | |||
| 54 | descent; | |||
| 55 | register int vpos, | |||
| 56 | hpos, | |||
| 57 | bpos = 0; | |||
| 58 | int bitmapByteWidth, | |||
| 59 | bitmapByteWidthPadded; | |||
| 60 | int bitmapBitWidth; | |||
| 61 | int span; | |||
| 62 | register unsigned char *p; | |||
| 63 | unsigned char *ink_mask = 0; | |||
| 64 | register int bmax; | |||
| 65 | register unsigned char charbits; | |||
| 66 | ||||
| 67 | if (pFont->bit == MSBFirst1) | |||
| ||||
| 68 | ink_mask = ink_mask_msb; | |||
| 69 | else if (pFont->bit == LSBFirst0) | |||
| 70 | ink_mask = ink_mask_lsb; | |||
| 71 | pInk->characterWidth = pCI->metrics.characterWidth; | |||
| 72 | pInk->attributes = pCI->metrics.attributes; | |||
| 73 | ||||
| 74 | leftBearing = pCI->metrics.leftSideBearing; | |||
| 75 | ascent = pCI->metrics.ascent; | |||
| 76 | descent = pCI->metrics.descent; | |||
| 77 | bitmapBitWidth = GLYPHWIDTHPIXELS(pCI)((pCI)->metrics.rightSideBearing - (pCI)->metrics.leftSideBearing ); | |||
| 78 | bitmapByteWidth = GLYPHWIDTHBYTES(pCI)(((((pCI)->metrics.rightSideBearing - (pCI)->metrics.leftSideBearing ))+7) >> 3); | |||
| 79 | bitmapByteWidthPadded = BYTES_PER_ROW(bitmapBitWidth, pFont->glyph)((pFont->glyph) == 1 ? (((bitmapBitWidth)+7)>>3) :(pFont ->glyph) == 2 ? ((((bitmapBitWidth)+15)>>3)&~1) : (pFont->glyph) == 4 ? ((((bitmapBitWidth)+31)>>3)& ~3) :(pFont->glyph) == 8 ? ((((bitmapBitWidth)+63)>> 3)&~7) : 0); | |||
| 80 | span = bitmapByteWidthPadded - bitmapByteWidth; | |||
| 81 | ||||
| 82 | p = (unsigned char *) pCI->bits; | |||
| 83 | for (vpos = descent + ascent; --vpos >= 0;) { | |||
| 84 | for (hpos = bitmapByteWidth; --hpos >= 0;) { | |||
| 85 | if (*p++ != 0) | |||
| 86 | goto found_ascent; | |||
| 87 | } | |||
| 88 | p += span; | |||
| 89 | } | |||
| 90 | /* | |||
| 91 | * special case -- font with no bits gets all zeros | |||
| 92 | */ | |||
| 93 | pInk->leftSideBearing = leftBearing; | |||
| 94 | pInk->rightSideBearing = leftBearing; | |||
| 95 | pInk->ascent = 0; | |||
| 96 | pInk->descent = 0; | |||
| 97 | return; | |||
| 98 | found_ascent: | |||
| 99 | pInk->ascent = vpos - descent + 1; | |||
| 100 | ||||
| 101 | p = ((unsigned char *) pCI->bits) + bitmapByteWidthPadded * | |||
| 102 | (descent + ascent - 1) + bitmapByteWidth; | |||
| 103 | ||||
| 104 | for (vpos = descent + ascent; --vpos >= 0;) { | |||
| 105 | for (hpos = bitmapByteWidth; --hpos >= 0;) { | |||
| 106 | if (*--p != 0) | |||
| 107 | goto found_descent; | |||
| 108 | } | |||
| 109 | p -= span; | |||
| 110 | } | |||
| 111 | found_descent: | |||
| 112 | pInk->descent = vpos - ascent + 1; | |||
| 113 | ||||
| 114 | bmax = 8; | |||
| 115 | for (hpos = 0; hpos < bitmapByteWidth; hpos++) { | |||
| 116 | charbits = 0; | |||
| 117 | p = (unsigned char *) pCI->bits + hpos; | |||
| 118 | for (vpos = descent + ascent; --vpos >= 0; p += bitmapByteWidthPadded) | |||
| 119 | charbits |= *p; | |||
| 120 | if (charbits) { | |||
| 121 | if (hpos == bitmapByteWidth - 1) | |||
| 122 | bmax = bitmapBitWidth - (hpos << 3); | |||
| 123 | p = ink_mask; | |||
| 124 | for (bpos = bmax; --bpos >= 0;) { | |||
| 125 | if (charbits & *p++) | |||
| 126 | goto found_left; | |||
| 127 | } | |||
| 128 | } | |||
| 129 | } | |||
| 130 | found_left: | |||
| 131 | pInk->leftSideBearing = leftBearing + (hpos << 3) + bmax - bpos - 1; | |||
| 132 | ||||
| 133 | bmax = bitmapBitWidth - ((bitmapByteWidth - 1) << 3); | |||
| 134 | for (hpos = bitmapByteWidth; --hpos >= 0;) { | |||
| 135 | charbits = 0; | |||
| 136 | p = (unsigned char *) pCI->bits + hpos; | |||
| 137 | for (vpos = descent + ascent; --vpos >= 0; p += bitmapByteWidthPadded) | |||
| 138 | charbits |= *p; | |||
| 139 | if (charbits) { | |||
| 140 | p = ink_mask + bmax; | |||
| 141 | for (bpos = bmax; --bpos >= 0;) { | |||
| 142 | if (charbits & *--p) | |||
| ||||
| 143 | goto found_right; | |||
| 144 | } | |||
| 145 | } | |||
| 146 | bmax = 8; | |||
| 147 | } | |||
| 148 | found_right: | |||
| 149 | pInk->rightSideBearing = leftBearing + (hpos << 3) + bpos + 1; | |||
| 150 | } | |||
| 151 | ||||
| 152 | #define ISBITONMSB(x, line)((line)[(x)/8] & (1 << (7-((x)%8)))) ((line)[(x)/8] & (1 << (7-((x)%8)))) | |||
| 153 | #define SETBITMSB(x, line)((line)[(x)/8] |= (1 << (7-((x)%8)))) ((line)[(x)/8] |= (1 << (7-((x)%8)))) | |||
| 154 | #define ISBITONLSB(x, line)((line)[(x)/8] & (1 << ((x)%8))) ((line)[(x)/8] & (1 << ((x)%8))) | |||
| 155 | #define SETBITLSB(x, line)((line)[(x)/8] |= (1 << ((x)%8))) ((line)[(x)/8] |= (1 << ((x)%8))) | |||
| 156 | ||||
| 157 | #define Min(a,b)((a)<(b)?(a):(b)) ((a)<(b)?(a):(b)) | |||
| 158 | #define Max(a,b)((a)>(b)?(a):(b)) ((a)>(b)?(a):(b)) | |||
| 159 | ||||
| 160 | void | |||
| 161 | FontCharReshape(FontPtr pFont, CharInfoPtr pSrc, CharInfoPtr pDst) | |||
| 162 | { | |||
| 163 | int x, | |||
| 164 | y; | |||
| 165 | unsigned char *in_line, | |||
| 166 | *out_line; | |||
| 167 | unsigned char *oldglyph, | |||
| 168 | *newglyph; | |||
| 169 | int inwidth; | |||
| 170 | int outwidth, | |||
| 171 | outheight; | |||
| 172 | int out_bytes, | |||
| 173 | in_bytes; | |||
| 174 | int y_min, | |||
| 175 | y_max, | |||
| 176 | x_min, | |||
| 177 | x_max; | |||
| 178 | ||||
| 179 | newglyph = (unsigned char *) pDst->bits; | |||
| 180 | outwidth = pDst->metrics.rightSideBearing - pDst->metrics.leftSideBearing; | |||
| 181 | outheight = pDst->metrics.descent + pDst->metrics.ascent; | |||
| 182 | out_bytes = BYTES_PER_ROW(outwidth, pFont->glyph)((pFont->glyph) == 1 ? (((outwidth)+7)>>3) :(pFont-> glyph) == 2 ? ((((outwidth)+15)>>3)&~1) :(pFont-> glyph) == 4 ? ((((outwidth)+31)>>3)&~3) :(pFont-> glyph) == 8 ? ((((outwidth)+63)>>3)&~7) : 0); | |||
| 183 | ||||
| 184 | oldglyph = (unsigned char *) pSrc->bits; | |||
| 185 | inwidth = pSrc->metrics.rightSideBearing - pSrc->metrics.leftSideBearing; | |||
| 186 | in_bytes = BYTES_PER_ROW(inwidth, pFont->glyph)((pFont->glyph) == 1 ? (((inwidth)+7)>>3) :(pFont-> glyph) == 2 ? ((((inwidth)+15)>>3)&~1) :(pFont-> glyph) == 4 ? ((((inwidth)+31)>>3)&~3) :(pFont-> glyph) == 8 ? ((((inwidth)+63)>>3)&~7) : 0); | |||
| 187 | ||||
| 188 | bzero(newglyph, out_bytes * outheight)__builtin___memset_chk (newglyph, 0, out_bytes * outheight, __builtin_object_size (newglyph, 0)); | |||
| 189 | in_line = oldglyph; | |||
| 190 | out_line = newglyph; | |||
| 191 | y_min = Max(-pSrc->metrics.ascent, -pDst->metrics.ascent)((-pSrc->metrics.ascent)>(-pDst->metrics.ascent)?(-pSrc ->metrics.ascent):(-pDst->metrics.ascent)); | |||
| 192 | y_max = Min(pSrc->metrics.descent, pDst->metrics.descent)((pSrc->metrics.descent)<(pDst->metrics.descent)?(pSrc ->metrics.descent):(pDst->metrics.descent)); | |||
| 193 | x_min = Max(pSrc->metrics.leftSideBearing, pDst->metrics.leftSideBearing)((pSrc->metrics.leftSideBearing)>(pDst->metrics.leftSideBearing )?(pSrc->metrics.leftSideBearing):(pDst->metrics.leftSideBearing )); | |||
| 194 | x_max = Min(pSrc->metrics.rightSideBearing, pDst->metrics.rightSideBearing)((pSrc->metrics.rightSideBearing)<(pDst->metrics.rightSideBearing )?(pSrc->metrics.rightSideBearing):(pDst->metrics.rightSideBearing )); | |||
| 195 | in_line += (y_min + pSrc->metrics.ascent) * in_bytes; | |||
| 196 | out_line += (y_min + pDst->metrics.ascent) * out_bytes; | |||
| 197 | if (pFont->bit == MSBFirst1) { | |||
| 198 | for (y = y_min; y < y_max; y++) { | |||
| 199 | for (x = x_min; x < x_max; x++) { | |||
| 200 | if (ISBITONMSB(x - pSrc->metrics.leftSideBearing, in_line)((in_line)[(x - pSrc->metrics.leftSideBearing)/8] & (1 << (7-((x - pSrc->metrics.leftSideBearing)%8))))) | |||
| 201 | SETBITMSB(x - pDst->metrics.leftSideBearing, out_line)((out_line)[(x - pDst->metrics.leftSideBearing)/8] |= (1 << (7-((x - pDst->metrics.leftSideBearing)%8)))); | |||
| 202 | } | |||
| 203 | in_line += in_bytes; | |||
| 204 | out_line += out_bytes; | |||
| 205 | } | |||
| 206 | } else { | |||
| 207 | for (y = y_min; y < y_max; y++) { | |||
| 208 | for (x = x_min; x < x_max; x++) { | |||
| 209 | if (ISBITONLSB(x - pSrc->metrics.leftSideBearing, in_line)((in_line)[(x - pSrc->metrics.leftSideBearing)/8] & (1 << ((x - pSrc->metrics.leftSideBearing)%8)))) | |||
| 210 | SETBITLSB(x - pDst->metrics.leftSideBearing, out_line)((out_line)[(x - pDst->metrics.leftSideBearing)/8] |= (1 << ((x - pDst->metrics.leftSideBearing)%8))); | |||
| 211 | } | |||
| 212 | in_line += in_bytes; | |||
| 213 | out_line += out_bytes; | |||
| 214 | } | |||
| 215 | } | |||
| 216 | } |