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/*
* libeg/load_icns.c
* Loading function for .icns Apple icon images
*
* Copyright (c) 2006 Christoph Pfisterer
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of Christoph Pfisterer nor the names of the
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "libegint.h"
//
// Decompress .icns RLE data
//
VOID egDecompressIcnsRLE(IN OUT UINT8 **CompData, IN OUT UINTN *CompLen, IN UINT8 *PixelData, IN UINTN PixelCount)
{
UINT8 *cp;
UINT8 *cp_end;
UINT8 *pp;
UINTN pp_left;
UINTN len, i;
UINT8 value;
// setup variables
cp = *CompData;
cp_end = cp + *CompLen;
pp = PixelData;
pp_left = PixelCount;
// decode
while (cp + 1 < cp_end && pp_left > 0) {
len = *cp++;
if (len & 0x80) { // compressed data: repeat next byte
len -= 125;
if (len > pp_left)
break;
value = *cp++;
for (i = 0; i < len; i++) {
*pp = value;
pp += 4;
}
} else { // uncompressed data: copy bytes
len++;
if (len > pp_left || cp + len > cp_end)
break;
for (i = 0; i < len; i++) {
*pp = *cp++;
pp += 4;
}
}
pp_left -= len;
}
if (pp_left > 0) {
Print(L" egDecompressIcnsRLE: still need %d bytes of pixel data\n", pp_left);
}
// record what's left of the compressed data stream
*CompData = cp;
*CompLen = (UINTN)(cp_end - cp);
}
//
// Load Apple .icns icons
//
EG_IMAGE * egDecodeICNS(IN UINT8 *FileData, IN UINTN FileDataLength, IN UINTN IconSize, IN BOOLEAN WantAlpha)
{
EG_IMAGE *NewImage;
UINT8 *Ptr, *BufferEnd, *DataPtr, *MaskPtr;
UINT32 BlockLen, DataLen, MaskLen;
UINTN FetchPixelSize, PixelCount, i;
UINT8 *CompData;
UINTN CompLen;
UINT8 *SrcPtr;
EG_PIXEL *DestPtr;
if (FileDataLength < 8 || FileData == NULL ||
FileData[0] != 'i' || FileData[1] != 'c' || FileData[2] != 'n' || FileData[3] != 's') {
// not an icns file...
return NULL;
}
FetchPixelSize = IconSize;
for (;;) {
DataPtr = NULL;
DataLen = 0;
MaskPtr = NULL;
MaskLen = 0;
Ptr = FileData + 8;
BufferEnd = FileData + FileDataLength;
// iterate over tagged blocks in the file
while (Ptr + 8 <= BufferEnd) {
BlockLen = ((UINT32)Ptr[4] << 24) + ((UINT32)Ptr[5] << 16) + ((UINT32)Ptr[6] << 8) + (UINT32)Ptr[7];
if (Ptr + BlockLen > BufferEnd) // block continues beyond end of file
break;
// extract the appropriate blocks for each pixel size
if (FetchPixelSize == 128) {
if (Ptr[0] == 'i' && Ptr[1] == 't' && Ptr[2] == '3' && Ptr[3] == '2') {
if (Ptr[8] == 0 && Ptr[9] == 0 && Ptr[10] == 0 && Ptr[11] == 0) {
DataPtr = Ptr + 12;
DataLen = BlockLen - 12;
}
} else if (Ptr[0] == 't' && Ptr[1] == '8' && Ptr[2] == 'm' && Ptr[3] == 'k') {
MaskPtr = Ptr + 8;
MaskLen = BlockLen - 8;
}
} else if (FetchPixelSize == 48) {
if (Ptr[0] == 'i' && Ptr[1] == 'h' && Ptr[2] == '3' && Ptr[3] == '2') {
DataPtr = Ptr + 8;
DataLen = BlockLen - 8;
} else if (Ptr[0] == 'h' && Ptr[1] == '8' && Ptr[2] == 'm' && Ptr[3] == 'k') {
MaskPtr = Ptr + 8;
MaskLen = BlockLen - 8;
}
} else if (FetchPixelSize == 32) {
if (Ptr[0] == 'i' && Ptr[1] == 'l' && Ptr[2] == '3' && Ptr[3] == '2') {
DataPtr = Ptr + 8;
DataLen = BlockLen - 8;
} else if (Ptr[0] == 'l' && Ptr[1] == '8' && Ptr[2] == 'm' && Ptr[3] == 'k') {
MaskPtr = Ptr + 8;
MaskLen = BlockLen - 8;
}
} else if (FetchPixelSize == 16) {
if (Ptr[0] == 'i' && Ptr[1] == 's' && Ptr[2] == '3' && Ptr[3] == '2') {
DataPtr = Ptr + 8;
DataLen = BlockLen - 8;
} else if (Ptr[0] == 's' && Ptr[1] == '8' && Ptr[2] == 'm' && Ptr[3] == 'k') {
MaskPtr = Ptr + 8;
MaskLen = BlockLen - 8;
}
}
Ptr += BlockLen;
}
/* FUTURE: try to load a different size and scale it later
if (DataPtr == NULL && FetchPixelSize == 32) {
FetchPixelSize = 128;
continue;
}
*/
break;
}
if (DataPtr == NULL)
return NULL; // no image found
// allocate image structure and buffer
NewImage = egCreateImage(FetchPixelSize, FetchPixelSize, WantAlpha);
if (NewImage == NULL)
return NULL;
PixelCount = FetchPixelSize * FetchPixelSize;
if (DataLen < PixelCount * 3) {
// pixel data is compressed, RGB planar
CompData = DataPtr;
CompLen = DataLen;
egDecompressIcnsRLE(&CompData, &CompLen, PLPTR(NewImage, r), PixelCount);
egDecompressIcnsRLE(&CompData, &CompLen, PLPTR(NewImage, g), PixelCount);
egDecompressIcnsRLE(&CompData, &CompLen, PLPTR(NewImage, b), PixelCount);
// possible assertion: CompLen == 0
if (CompLen > 0) {
Print(L" egLoadICNSIcon: %d bytes of compressed data left\n", CompLen);
}
} else {
// pixel data is uncompressed, RGB interleaved
SrcPtr = DataPtr;
DestPtr = NewImage->PixelData;
for (i = 0; i < PixelCount; i++, DestPtr++) {
DestPtr->r = *SrcPtr++;
DestPtr->g = *SrcPtr++;
DestPtr->b = *SrcPtr++;
}
}
// add/set alpha plane
if (MaskPtr != NULL && MaskLen >= PixelCount && WantAlpha)
egInsertPlane(MaskPtr, PLPTR(NewImage, a), PixelCount);
else
egSetPlane(PLPTR(NewImage, a), WantAlpha ? 255 : 0, PixelCount);
// FUTURE: scale to originally requested size if we had to load another size
return NewImage;
}
/* EOF */
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