| 1 | /*␊ |
| 2 | * libeg/load_icns.c␊ |
| 3 | * Loading function for .icns Apple icon images␊ |
| 4 | *␊ |
| 5 | * Copyright (c) 2006 Christoph Pfisterer␊ |
| 6 | * All rights reserved.␊ |
| 7 | *␊ |
| 8 | * Redistribution and use in source and binary forms, with or without␊ |
| 9 | * modification, are permitted provided that the following conditions are␊ |
| 10 | * met:␊ |
| 11 | *␊ |
| 12 | * * Redistributions of source code must retain the above copyright␊ |
| 13 | * notice, this list of conditions and the following disclaimer.␊ |
| 14 | *␊ |
| 15 | * * Redistributions in binary form must reproduce the above copyright␊ |
| 16 | * notice, this list of conditions and the following disclaimer in the␊ |
| 17 | * documentation and/or other materials provided with the␊ |
| 18 | * distribution.␊ |
| 19 | *␊ |
| 20 | * * Neither the name of Christoph Pfisterer nor the names of the␊ |
| 21 | * contributors may be used to endorse or promote products derived␊ |
| 22 | * from this software without specific prior written permission.␊ |
| 23 | *␊ |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS␊ |
| 25 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT␊ |
| 26 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR␊ |
| 27 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT␊ |
| 28 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,␊ |
| 29 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT␊ |
| 30 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,␊ |
| 31 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY␊ |
| 32 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT␊ |
| 33 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE␊ |
| 34 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.␊ |
| 35 | */␊ |
| 36 | ␊ |
| 37 | #include "libegint.h"␊ |
| 38 | ␊ |
| 39 | //␊ |
| 40 | // Decompress .icns RLE data␊ |
| 41 | //␊ |
| 42 | ␊ |
| 43 | VOID egDecompressIcnsRLE(IN OUT UINT8 **CompData, IN OUT UINTN *CompLen, IN UINT8 *PixelData, IN UINTN PixelCount)␊ |
| 44 | {␊ |
| 45 | UINT8 *cp;␊ |
| 46 | UINT8 *cp_end;␊ |
| 47 | UINT8 *pp;␊ |
| 48 | UINTN pp_left;␊ |
| 49 | UINTN len, i;␊ |
| 50 | UINT8 value;␊ |
| 51 | ␊ |
| 52 | // setup variables␊ |
| 53 | cp = *CompData;␊ |
| 54 | cp_end = cp + *CompLen;␊ |
| 55 | pp = PixelData;␊ |
| 56 | pp_left = PixelCount;␊ |
| 57 | ␊ |
| 58 | // decode␊ |
| 59 | while (cp + 1 < cp_end && pp_left > 0) {␊ |
| 60 | len = *cp++;␊ |
| 61 | if (len & 0x80) { // compressed data: repeat next byte␊ |
| 62 | len -= 125;␊ |
| 63 | if (len > pp_left)␊ |
| 64 | break;␊ |
| 65 | value = *cp++;␊ |
| 66 | for (i = 0; i < len; i++) {␊ |
| 67 | *pp = value;␊ |
| 68 | pp += 4;␊ |
| 69 | }␊ |
| 70 | } else { // uncompressed data: copy bytes␊ |
| 71 | len++;␊ |
| 72 | if (len > pp_left || cp + len > cp_end)␊ |
| 73 | break;␊ |
| 74 | for (i = 0; i < len; i++) {␊ |
| 75 | *pp = *cp++;␊ |
| 76 | pp += 4;␊ |
| 77 | }␊ |
| 78 | }␊ |
| 79 | pp_left -= len;␊ |
| 80 | }␊ |
| 81 | ␊ |
| 82 | if (pp_left > 0) {␊ |
| 83 | printf(" egDecompressIcnsRLE: still need %d bytes of pixel data\n", pp_left);␊ |
| 84 | }␊ |
| 85 | ␊ |
| 86 | // record what's left of the compressed data stream␊ |
| 87 | *CompData = cp;␊ |
| 88 | *CompLen = (UINTN)(cp_end - cp);␊ |
| 89 | }␊ |
| 90 | ␊ |
| 91 | //␊ |
| 92 | // Load Apple .icns icons␊ |
| 93 | //␊ |
| 94 | ␊ |
| 95 | EG_IMAGE * egDecodeICNS(IN UINT8 *FileData, IN UINTN FileDataLength, IN UINTN IconSize, IN BOOLEAN WantAlpha)␊ |
| 96 | {␊ |
| 97 | EG_IMAGE *NewImage;␊ |
| 98 | UINT8 *Ptr, *BufferEnd, *DataPtr, *MaskPtr;␊ |
| 99 | UINT32 BlockLen, DataLen, MaskLen;␊ |
| 100 | UINTN FetchPixelSize, PixelCount, i;␊ |
| 101 | UINT8 *CompData;␊ |
| 102 | UINTN CompLen;␊ |
| 103 | UINT8 *SrcPtr;␊ |
| 104 | EG_PIXEL *DestPtr;␊ |
| 105 | ␊ |
| 106 | if (FileDataLength < 8 || FileData == NULL ||␊ |
| 107 | FileData[0] != 'i' || FileData[1] != 'c' || FileData[2] != 'n' || FileData[3] != 's') {␊ |
| 108 | // not an icns file...␊ |
| 109 | return NULL;␊ |
| 110 | }␊ |
| 111 | ␊ |
| 112 | FetchPixelSize = IconSize;␊ |
| 113 | for (;;) {␊ |
| 114 | DataPtr = NULL;␊ |
| 115 | DataLen = 0;␊ |
| 116 | MaskPtr = NULL;␊ |
| 117 | MaskLen = 0;␊ |
| 118 | ␊ |
| 119 | Ptr = FileData + 8;␊ |
| 120 | BufferEnd = FileData + FileDataLength;␊ |
| 121 | // iterate over tagged blocks in the file␊ |
| 122 | while (Ptr + 8 <= BufferEnd) {␊ |
| 123 | BlockLen = ((UINT32)Ptr[4] << 24) + ((UINT32)Ptr[5] << 16) + ((UINT32)Ptr[6] << 8) + (UINT32)Ptr[7];␊ |
| 124 | if (Ptr + BlockLen > BufferEnd) // block continues beyond end of file␊ |
| 125 | break;␊ |
| 126 | ␊ |
| 127 | // extract the appropriate blocks for each pixel size␊ |
| 128 | if (FetchPixelSize == 128) {␊ |
| 129 | if (Ptr[0] == 'i' && Ptr[1] == 't' && Ptr[2] == '3' && Ptr[3] == '2') {␊ |
| 130 | if (Ptr[8] == 0 && Ptr[9] == 0 && Ptr[10] == 0 && Ptr[11] == 0) {␊ |
| 131 | DataPtr = Ptr + 12;␊ |
| 132 | DataLen = BlockLen - 12;␊ |
| 133 | }␊ |
| 134 | } else if (Ptr[0] == 't' && Ptr[1] == '8' && Ptr[2] == 'm' && Ptr[3] == 'k') {␊ |
| 135 | MaskPtr = Ptr + 8;␊ |
| 136 | MaskLen = BlockLen - 8;␊ |
| 137 | }␊ |
| 138 | ␊ |
| 139 | } else if (FetchPixelSize == 48) {␊ |
| 140 | if (Ptr[0] == 'i' && Ptr[1] == 'h' && Ptr[2] == '3' && Ptr[3] == '2') {␊ |
| 141 | DataPtr = Ptr + 8;␊ |
| 142 | DataLen = BlockLen - 8;␊ |
| 143 | } else if (Ptr[0] == 'h' && Ptr[1] == '8' && Ptr[2] == 'm' && Ptr[3] == 'k') {␊ |
| 144 | MaskPtr = Ptr + 8;␊ |
| 145 | MaskLen = BlockLen - 8;␊ |
| 146 | }␊ |
| 147 | ␊ |
| 148 | } else if (FetchPixelSize == 32) {␊ |
| 149 | if (Ptr[0] == 'i' && Ptr[1] == 'l' && Ptr[2] == '3' && Ptr[3] == '2') {␊ |
| 150 | DataPtr = Ptr + 8;␊ |
| 151 | DataLen = BlockLen - 8;␊ |
| 152 | } else if (Ptr[0] == 'l' && Ptr[1] == '8' && Ptr[2] == 'm' && Ptr[3] == 'k') {␊ |
| 153 | MaskPtr = Ptr + 8;␊ |
| 154 | MaskLen = BlockLen - 8;␊ |
| 155 | }␊ |
| 156 | ␊ |
| 157 | } else if (FetchPixelSize == 16) {␊ |
| 158 | if (Ptr[0] == 'i' && Ptr[1] == 's' && Ptr[2] == '3' && Ptr[3] == '2') {␊ |
| 159 | DataPtr = Ptr + 8;␊ |
| 160 | DataLen = BlockLen - 8;␊ |
| 161 | } else if (Ptr[0] == 's' && Ptr[1] == '8' && Ptr[2] == 'm' && Ptr[3] == 'k') {␊ |
| 162 | MaskPtr = Ptr + 8;␊ |
| 163 | MaskLen = BlockLen - 8;␊ |
| 164 | }␊ |
| 165 | ␊ |
| 166 | }␊ |
| 167 | ␊ |
| 168 | Ptr += BlockLen;␊ |
| 169 | }␊ |
| 170 | ␊ |
| 171 | /* FUTURE: try to load a different size and scale it later␊ |
| 172 | if (DataPtr == NULL && FetchPixelSize == 32) {␊ |
| 173 | FetchPixelSize = 128;␊ |
| 174 | continue;␊ |
| 175 | }␊ |
| 176 | */␊ |
| 177 | break;␊ |
| 178 | }␊ |
| 179 | ␊ |
| 180 | if (DataPtr == NULL)␊ |
| 181 | return NULL; // no image found␊ |
| 182 | ␊ |
| 183 | // allocate image structure and buffer␊ |
| 184 | NewImage = egCreateImage(FetchPixelSize, FetchPixelSize, WantAlpha);␊ |
| 185 | if (NewImage == NULL)␊ |
| 186 | return NULL;␊ |
| 187 | PixelCount = FetchPixelSize * FetchPixelSize;␊ |
| 188 | ␊ |
| 189 | if (DataLen < PixelCount * 3) {␊ |
| 190 | ␊ |
| 191 | // pixel data is compressed, RGB planar␊ |
| 192 | CompData = DataPtr;␊ |
| 193 | CompLen = DataLen;␊ |
| 194 | egDecompressIcnsRLE(&CompData, &CompLen, PLPTR(NewImage, r), PixelCount);␊ |
| 195 | egDecompressIcnsRLE(&CompData, &CompLen, PLPTR(NewImage, g), PixelCount);␊ |
| 196 | egDecompressIcnsRLE(&CompData, &CompLen, PLPTR(NewImage, b), PixelCount);␊ |
| 197 | // possible assertion: CompLen == 0␊ |
| 198 | if (CompLen > 0) {␊ |
| 199 | printf(" egLoadICNSIcon: %d bytes of compressed data left\n", CompLen);␊ |
| 200 | }␊ |
| 201 | ␊ |
| 202 | } else {␊ |
| 203 | ␊ |
| 204 | // pixel data is uncompressed, RGB interleaved␊ |
| 205 | SrcPtr = DataPtr;␊ |
| 206 | DestPtr = NewImage->PixelData;␊ |
| 207 | for (i = 0; i < PixelCount; i++, DestPtr++) {␊ |
| 208 | DestPtr->r = *SrcPtr++;␊ |
| 209 | DestPtr->g = *SrcPtr++;␊ |
| 210 | DestPtr->b = *SrcPtr++;␊ |
| 211 | }␊ |
| 212 | ␊ |
| 213 | }␊ |
| 214 | ␊ |
| 215 | // add/set alpha plane␊ |
| 216 | if (MaskPtr != NULL && MaskLen >= PixelCount && WantAlpha)␊ |
| 217 | egInsertPlane(MaskPtr, PLPTR(NewImage, a), PixelCount);␊ |
| 218 | else␊ |
| 219 | egSetPlane(PLPTR(NewImage, a), WantAlpha ? 255 : 0, PixelCount);␊ |
| 220 | ␊ |
| 221 | // FUTURE: scale to originally requested size if we had to load another size␊ |
| 222 | ␊ |
| 223 | return NewImage;␊ |
| 224 | }␊ |
| 225 | ␊ |
| 226 | /* EOF */␊ |
| 227 | |
