diff options
Diffstat (limited to 'plugins/FreeImage/Source/FreeImage/PluginSGI.cpp')
| -rw-r--r-- | plugins/FreeImage/Source/FreeImage/PluginSGI.cpp | 425 |
1 files changed, 425 insertions, 0 deletions
diff --git a/plugins/FreeImage/Source/FreeImage/PluginSGI.cpp b/plugins/FreeImage/Source/FreeImage/PluginSGI.cpp new file mode 100644 index 0000000000..38ac293b78 --- /dev/null +++ b/plugins/FreeImage/Source/FreeImage/PluginSGI.cpp @@ -0,0 +1,425 @@ +// ==========================================================
+// SGI Loader
+//
+// Design and implementation by
+// - Sherman Wilcox
+// - Noam Gat
+//
+// References :
+// ------------
+// - The SGI Image File Format, Version 1.0
+// http://astronomy.swin.edu.au/~pbourke/dataformats/sgirgb/sgiversion.html
+// - SGI RGB Image Format
+// http://astronomy.swin.edu.au/~pbourke/dataformats/sgirgb/
+//
+//
+// This file is part of FreeImage 3
+//
+// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
+// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
+// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
+// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
+// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
+// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
+// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
+// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
+// THIS DISCLAIMER.
+//
+// Use at your own risk!
+// ==========================================================
+
+#include "FreeImage.h"
+#include "Utilities.h"
+
+// ----------------------------------------------------------
+// Constants + headers
+// ----------------------------------------------------------
+
+#ifdef _WIN32
+#pragma pack(push, 1)
+#else
+#pragma pack(1)
+#endif
+
+typedef struct tagSGIHeader {
+ /** IRIS image file magic number. This should be decimal 474. */
+ WORD magic;
+ /** Storage format: 0 for uncompressed, 1 for RLE compression. */
+ BYTE storage;
+ /** Number of bytes per pixel channel. Legally 1 or 2. */
+ BYTE bpc;
+ /**
+ Number of dimensions. Legally 1, 2, or 3.
+ 1 means a single row, XSIZE long
+ 2 means a single 2D image
+ 3 means multiple 2D images
+ */
+ WORD dimension;
+ /** X size in pixels */
+ WORD xsize;
+ /** Y size in pixels */
+ WORD ysize;
+ /**
+ Number of channels.
+ 1 indicates greyscale
+ 3 indicates RGB
+ 4 indicates RGB and Alpha
+ */
+ WORD zsize;
+ /** Minimum pixel value. This is the lowest pixel value in the image.*/
+ LONG pixmin;
+ /** Maximum pixel value. This is the highest pixel value in the image.*/
+ LONG pixmax;
+ /** Ignored. Normally set to 0. */
+ char dummy[4];
+ /** Image name. Must be null terminated, therefore at most 79 bytes. */
+ char imagename[80];
+ /**
+ Colormap ID.
+ 0 - normal mode
+ 1 - dithered, 3 mits for red and green, 2 for blue, obsolete
+ 2 - index colour, obsolete
+ 3 - not an image but a colourmap
+ */
+ LONG colormap;
+ /** Ignored. Should be set to 0, makes the header 512 bytes. */
+ char reserved[404];
+} SGIHeader;
+
+typedef struct tagRLEStatus {
+ int cnt;
+ int val;
+} RLEStatus;
+
+#ifdef _WIN32
+#pragma pack(pop)
+#else
+#pragma pack()
+#endif
+
+static const char *SGI_LESS_THAN_HEADER_LENGTH = "Incorrect header size";
+static const char *SGI_16_BIT_COMPONENTS_NOT_SUPPORTED = "No 16 bit support";
+static const char *SGI_COLORMAPS_NOT_SUPPORTED = "No colormap support";
+static const char *SGI_EOF_IN_RLE_INDEX = "EOF in run length encoding";
+static const char *SGI_EOF_IN_IMAGE_DATA = "EOF in image data";
+static const char *SGI_INVALID_CHANNEL_COUNT = "Invalid channel count";
+
+// ==========================================================
+// Plugin Interface
+// ==========================================================
+
+static int s_format_id;
+
+// ==========================================================
+// Plugin Implementation
+// ==========================================================
+
+#ifndef FREEIMAGE_BIGENDIAN
+static void
+SwapHeader(SGIHeader *header) {
+ SwapShort(&header->magic);
+ SwapShort(&header->dimension);
+ SwapShort(&header->xsize);
+ SwapShort(&header->ysize);
+ SwapShort(&header->zsize);
+ SwapLong((DWORD*)&header->pixmin);
+ SwapLong((DWORD*)&header->pixmax);
+ SwapLong((DWORD*)&header->colormap);
+}
+#endif
+
+static int
+get_rlechar(FreeImageIO *io, fi_handle handle, RLEStatus *pstatus) {
+ if (!pstatus->cnt) {
+ int cnt = 0;
+ while (0 == cnt) {
+ BYTE packed = 0;
+ if(io->read_proc(&packed, sizeof(BYTE), 1, handle) < 1) {
+ return EOF;
+ }
+ cnt = packed;
+ }
+ if (cnt == EOF) {
+ return EOF;
+ }
+ pstatus->cnt = cnt & 0x7F;
+ if (cnt & 0x80) {
+ pstatus->val = -1;
+ } else {
+ BYTE packed = 0;
+ if(io->read_proc(&packed, sizeof(BYTE), 1, handle) < 1) {
+ return EOF;
+ }
+ pstatus->val = packed;
+ }
+ }
+ pstatus->cnt--;
+ if (pstatus->val == -1) {
+ BYTE packed = 0;
+ if(io->read_proc(&packed, sizeof(BYTE), 1, handle) < 1) {
+ return EOF;
+ }
+ return packed;
+ }
+ else {
+ return pstatus->val;
+ }
+}
+
+static const char * DLL_CALLCONV
+Format() {
+ return "SGI";
+}
+
+static const char * DLL_CALLCONV
+Description() {
+ return "SGI Image Format";
+}
+
+static const char * DLL_CALLCONV
+Extension() {
+ return "sgi";
+}
+
+static const char * DLL_CALLCONV
+RegExpr() {
+ return NULL;
+}
+
+static const char * DLL_CALLCONV
+MimeType() {
+ return "image/sgi";
+}
+
+static BOOL DLL_CALLCONV
+Validate(FreeImageIO *io, fi_handle handle) {
+ BYTE sgi_signature[2] = { 0x01, 0xDA };
+ BYTE signature[2] = { 0, 0 };
+
+ io->read_proc(signature, 1, sizeof(sgi_signature), handle);
+
+ return (memcmp(sgi_signature, signature, sizeof(sgi_signature)) == 0);
+}
+
+static BOOL DLL_CALLCONV
+SupportsExportDepth(int depth) {
+ return FALSE;
+}
+
+static BOOL DLL_CALLCONV
+SupportsExportType(FREE_IMAGE_TYPE type) {
+ return FALSE;
+}
+
+static FIBITMAP * DLL_CALLCONV
+Load(FreeImageIO *io, fi_handle handle, int page, int flags, void *data) {
+ int width = 0, height = 0, zsize = 0;
+ int i, dim;
+ int bitcount;
+ SGIHeader sgiHeader;
+ RLEStatus my_rle_status;
+ FIBITMAP *dib = NULL;
+ LONG *pRowIndex = NULL;
+
+ try {
+ // read the header
+ memset(&sgiHeader, 0, sizeof(SGIHeader));
+ if(io->read_proc(&sgiHeader, 1, sizeof(SGIHeader), handle) < sizeof(SGIHeader)) {
+ throw SGI_LESS_THAN_HEADER_LENGTH;
+ }
+#ifndef FREEIMAGE_BIGENDIAN
+ SwapHeader(&sgiHeader);
+#endif
+ if(sgiHeader.magic != 474) {
+ throw FI_MSG_ERROR_MAGIC_NUMBER;
+ }
+
+ BOOL bIsRLE = (sgiHeader.storage == 1) ? TRUE : FALSE;
+
+ // check for unsupported image types
+ if (sgiHeader.bpc != 1) {
+ // Expected one byte per color component
+ throw SGI_16_BIT_COMPONENTS_NOT_SUPPORTED;
+ }
+ if (sgiHeader.colormap != 0) {
+ // Indexed or dithered images not supported
+ throw SGI_COLORMAPS_NOT_SUPPORTED;
+ }
+
+ // get the width & height
+ dim = sgiHeader.dimension;
+ width = sgiHeader.xsize;
+ if (dim < 3) {
+ zsize = 1;
+ } else {
+ zsize = sgiHeader.zsize;
+ }
+
+ if (dim < 2) {
+ height = 1;
+ } else {
+ height = sgiHeader.ysize;
+ }
+
+ if(bIsRLE) {
+ // read the Offset Tables
+ int index_len = height * zsize;
+ pRowIndex = (LONG*)malloc(index_len * sizeof(LONG));
+ if(!pRowIndex) {
+ throw FI_MSG_ERROR_MEMORY;
+ }
+
+ if ((unsigned)index_len != io->read_proc(pRowIndex, sizeof(LONG), index_len, handle)) {
+ throw SGI_EOF_IN_RLE_INDEX;
+ }
+
+#ifndef FREEIMAGE_BIGENDIAN
+ // Fix byte order in index
+ for (i = 0; i < index_len; i++) {
+ SwapLong((DWORD*)&pRowIndex[i]);
+ }
+#endif
+ // Discard row size index
+ for (i = 0; i < (int)(index_len * sizeof(LONG)); i++) {
+ BYTE packed = 0;
+ if( io->read_proc(&packed, sizeof(BYTE), 1, handle) < 1 ) {
+ throw SGI_EOF_IN_RLE_INDEX;
+ }
+ }
+ }
+
+ switch(zsize) {
+ case 1:
+ bitcount = 8;
+ break;
+ case 2:
+ //Grayscale+Alpha. Need to fake RGBA
+ bitcount = 32;
+ break;
+ case 3:
+ bitcount = 24;
+ break;
+ case 4:
+ bitcount = 32;
+ break;
+ default:
+ throw SGI_INVALID_CHANNEL_COUNT;
+ }
+
+ dib = FreeImage_Allocate(width, height, bitcount);
+ if(!dib) {
+ throw FI_MSG_ERROR_DIB_MEMORY;
+ }
+
+ if (bitcount == 8) {
+ // 8-bit SGI files are grayscale images, so we'll generate
+ // a grayscale palette.
+ RGBQUAD *pclrs = FreeImage_GetPalette(dib);
+ for (i = 0; i < 256; i++) {
+ pclrs[i].rgbRed = (BYTE)i;
+ pclrs[i].rgbGreen = (BYTE)i;
+ pclrs[i].rgbBlue = (BYTE)i;
+ pclrs[i].rgbReserved = 0;
+ }
+ }
+
+ // decode the image
+
+ memset(&my_rle_status, 0, sizeof(RLEStatus));
+
+ int ns = FreeImage_GetPitch(dib);
+ BYTE *pStartRow = FreeImage_GetScanLine(dib, 0);
+ int offset_table[] = { 2, 1, 0, 3 };
+ int numChannels = zsize;
+ if (zsize < 3) {
+ offset_table[0] = 0;
+ }
+ if (zsize == 2)
+ {
+ //This is how faked grayscale+alpha works.
+ //First channel goes into first
+ //second channel goes into alpha (4th channel)
+ //Two channels are left empty and will be copied later
+ offset_table[1] = 3;
+ numChannels = 4;
+ }
+
+ LONG *pri = pRowIndex;
+ for (i = 0; i < zsize; i++) {
+ BYTE *pRow = pStartRow + offset_table[i];
+ for (int j = 0; j < height; j++, pRow += ns, pri++) {
+ BYTE *p = pRow;
+ if (bIsRLE) {
+ my_rle_status.cnt = 0;
+ io->seek_proc(handle, *pri, SEEK_SET);
+ }
+ for (int k = 0; k < width; k++, p += numChannels) {
+ int ch;
+ BYTE packed = 0;
+ if (bIsRLE) {
+ ch = get_rlechar(io, handle, &my_rle_status);
+ packed = (BYTE)ch;
+ }
+ else {
+ ch = io->read_proc(&packed, sizeof(BYTE), 1, handle);
+ }
+ if (ch == EOF) {
+ throw SGI_EOF_IN_IMAGE_DATA;
+ }
+ *p = packed;
+ }
+ }
+ }
+
+ if (zsize == 2)
+ {
+ BYTE *pRow = pStartRow;
+ //If faking RGBA from grayscale + alpha, copy first channel to second and third
+ for (int i=0; i<height; i++, pRow += ns)
+ {
+ BYTE *pPixel = pRow;
+ for (int j=0; j<width; j++)
+ {
+ pPixel[2] = pPixel[1] = pPixel[0];
+ pPixel += 4;
+ }
+ }
+ }
+ if(pRowIndex)
+ free(pRowIndex);
+
+ return dib;
+
+ } catch(const char *text) {
+ if(pRowIndex) free(pRowIndex);
+ if(dib) FreeImage_Unload(dib);
+ FreeImage_OutputMessageProc(s_format_id, text);
+ return NULL;
+ }
+}
+
+// ==========================================================
+// Init
+// ==========================================================
+
+void DLL_CALLCONV
+InitSGI(Plugin *plugin, int format_id) {
+ s_format_id = format_id;
+
+ plugin->format_proc = Format;
+ plugin->description_proc = Description;
+ plugin->extension_proc = Extension;
+ plugin->regexpr_proc = RegExpr;
+ plugin->open_proc = NULL;
+ plugin->close_proc = NULL;
+ plugin->pagecount_proc = NULL;
+ plugin->pagecapability_proc = NULL;
+ plugin->load_proc = Load;
+ plugin->save_proc = NULL;
+ plugin->validate_proc = Validate;
+ plugin->mime_proc = MimeType;
+ plugin->supports_export_bpp_proc = SupportsExportDepth;
+ plugin->supports_export_type_proc = SupportsExportType;
+ plugin->supports_icc_profiles_proc = NULL;
+}
+
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