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+// ==========================================================
+// Utility functions
+//
+// Design and implementation by
+// - Floris van den Berg (flvdberg@wxs.nl)
+// - Hervé Drolon <drolon@infonie.fr>
+// - Ryan Rubley (ryan@lostreality.org)
+//
+// 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!
+// ==========================================================
+
+#ifndef UTILITIES_H
+#define UTILITIES_H
+
+// ==========================================================
+// Standard includes used by the library
+// ==========================================================
+
+#include <math.h>
+#include <stdlib.h>
+#include <memory.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <ctype.h>
+#include <assert.h>
+#include <errno.h>
+#include <float.h>
+#include <limits.h>
+
+#include <string>
+#include <list>
+#include <map>
+#include <set>
+#include <vector>
+#include <stack>
+#include <sstream>
+#include <algorithm>
+#include <limits>
+#include <memory>
+
+// ==========================================================
+// Bitmap palette and pixels alignment
+// ==========================================================
+
+#define FIBITMAP_ALIGNMENT 16 // We will use a 16 bytes alignment boundary
+
+// Memory allocation on a specified alignment boundary
+// defined in BitmapAccess.cpp
+
+void* FreeImage_Aligned_Malloc(size_t amount, size_t alignment);
+void FreeImage_Aligned_Free(void* mem);
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+/**
+Allocate a FIBITMAP with possibly no pixel data
+(i.e. only header data and some or all metadata)
+@param header_only If TRUE, allocate a 'header only' FIBITMAP, otherwise allocate a full FIBITMAP
+@param type Image type
+@param width
+@param height
+@param bpp
+@param red_mask
+@param green_mask
+@param blue_mask
+@see FreeImage_AllocateT
+*/
+DLL_API FIBITMAP * DLL_CALLCONV FreeImage_AllocateHeaderT(BOOL header_only, FREE_IMAGE_TYPE type, int width, int height, int bpp FI_DEFAULT(8), unsigned red_mask FI_DEFAULT(0), unsigned green_mask FI_DEFAULT(0), unsigned blue_mask FI_DEFAULT(0));
+
+/**
+Allocate a FIBITMAP of type FIT_BITMAP, with possibly no pixel data
+(i.e. only header data and some or all metadata)
+@param header_only If TRUE, allocate a 'header only' FIBITMAP, otherwise allocate a full FIBITMAP
+@param width
+@param height
+@param bpp
+@param red_mask
+@param green_mask
+@param blue_mask
+@see FreeImage_Allocate
+*/
+DLL_API FIBITMAP * DLL_CALLCONV FreeImage_AllocateHeader(BOOL header_only, int width, int height, int bpp, unsigned red_mask FI_DEFAULT(0), unsigned green_mask FI_DEFAULT(0), unsigned blue_mask FI_DEFAULT(0));
+
+#if defined(__cplusplus)
+}
+#endif
+
+
+// ==========================================================
+// File I/O structs
+// ==========================================================
+
+// these structs are for file I/O and should not be confused with similar
+// structs in FreeImage.h which are for in-memory bitmap handling
+
+#ifdef _WIN32
+#pragma pack(push, 1)
+#else
+#pragma pack(1)
+#endif // _WIN32
+
+typedef struct tagFILE_RGBA {
+ unsigned char r,g,b,a;
+} FILE_RGBA;
+
+typedef struct tagFILE_BGRA {
+ unsigned char b,g,r,a;
+} FILE_BGRA;
+
+typedef struct tagFILE_RGB {
+ unsigned char r,g,b;
+} FILE_RGB;
+
+typedef struct tagFILE_BGR {
+ unsigned char b,g,r;
+} FILE_BGR;
+
+#ifdef _WIN32
+#pragma pack(pop)
+#else
+#pragma pack()
+#endif // _WIN32
+
+// ==========================================================
+// Template utility functions
+// ==========================================================
+
+/// Max function
+template <class T> T MAX(const T &a, const T &b) {
+ return (a > b) ? a: b;
+}
+
+/// Min function
+template <class T> T MIN(const T &a, const T &b) {
+ return (a < b) ? a: b;
+}
+
+/// INPLACESWAP adopted from codeguru.com
+template <class T> void INPLACESWAP(T& a, T& b) {
+ a ^= b; b ^= a; a ^= b;
+}
+
+/// Clamp function
+template <class T> T CLAMP(const T &value, const T &min_value, const T &max_value) {
+ return ((value < min_value) ? min_value : (value > max_value) ? max_value : value);
+}
+
+/** This procedure computes minimum min and maximum max
+ of n numbers using only (3n/2) - 2 comparisons.
+ min = L[i1] and max = L[i2].
+ ref: Aho A.V., Hopcroft J.E., Ullman J.D.,
+ The design and analysis of computer algorithms,
+ Addison-Wesley, Reading, 1974.
+*/
+template <class T> void
+MAXMIN(const T* L, long n, T& max, T& min) {
+ long i1, i2, i, j;
+ T x1, x2;
+ long k1, k2;
+
+ i1 = 0; i2 = 0; min = L[0]; max = L[0]; j = 0;
+ if ((n % 2) != 0) j = 1;
+ for(i = j; i < n; i+= 2) {
+ k1 = i; k2 = i+1;
+ x1 = L[k1]; x2 = L[k2];
+ if(x1 > x2) {
+ k1 = k2; k2 = i;
+ x1 = x2; x2 = L[k2];
+ }
+ if(x1 < min) {
+ min = x1; i1 = k1;
+ }
+ if(x2 > max) {
+ max = x2; i2 = k2;
+ }
+ }
+}
+
+// ==========================================================
+// Utility functions
+// ==========================================================
+
+#ifndef _WIN32
+inline char*
+i2a(unsigned i, char *a, unsigned r) {
+ if (i/r > 0) a = i2a(i/r,a,r);
+ *a = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"[i%r];
+ return a+1;
+}
+
+/**
+ Transforms integer i into an ascii string and stores the result in a;
+ string is encoded in the base indicated by r.
+ @param i Number to be converted
+ @param a String result
+ @param r Base of value; must be in the range 2 - 36
+ @return Returns a
+*/
+inline char *
+_itoa(int i, char *a, int r) {
+ r = ((r < 2) || (r > 36)) ? 10 : r;
+ if(i < 0) {
+ *a = '-';
+ *i2a(-i, a+1, r) = 0;
+ }
+ else *i2a(i, a, r) = 0;
+ return a;
+}
+
+#endif // !_WIN32
+
+inline unsigned char
+HINIBBLE (unsigned char byte) {
+ return byte & 0xF0;
+}
+
+inline unsigned char
+LOWNIBBLE (unsigned char byte) {
+ return byte & 0x0F;
+}
+
+inline int
+CalculateUsedBits(int bits) {
+ int bit_count = 0;
+ unsigned bit = 1;
+
+ for (unsigned i = 0; i < 32; i++) {
+ if ((bits & bit) == bit) {
+ bit_count++;
+ }
+
+ bit <<= 1;
+ }
+
+ return bit_count;
+}
+
+inline unsigned
+CalculateLine(unsigned width, unsigned bitdepth) {
+ return (unsigned)( ((unsigned __int64)width * bitdepth + 7) / 8 );
+}
+
+inline unsigned
+CalculatePitch(unsigned line) {
+ return line + 3 & ~3;
+}
+
+inline unsigned
+CalculateUsedPaletteEntries(unsigned bit_count) {
+ if ((bit_count >= 1) && (bit_count <= 8))
+ return 1 << bit_count;
+
+ return 0;
+}
+
+inline unsigned char *
+CalculateScanLine(unsigned char *bits, unsigned pitch, int scanline) {
+ return (bits + (pitch * scanline));
+}
+
+// ----------------------------------------------------------
+
+/**
+Fast generic assign (faster than for loop)
+@param dst Destination pixel
+@param src Source pixel
+@param bytesperpixel # of bytes per pixel
+*/
+inline void
+AssignPixel(BYTE* dst, const BYTE* src, unsigned bytesperpixel) {
+ switch (bytesperpixel) {
+ case 1: // FIT_BITMAP (8-bit)
+ *dst = *src;
+ break;
+
+ case 2: // FIT_UINT16 / FIT_INT16 / 16-bit
+ *(reinterpret_cast<WORD*>(dst)) = *(reinterpret_cast<const WORD*> (src));
+ break;
+
+ case 3: // FIT_BITMAP (24-bit)
+ *(reinterpret_cast<WORD*>(dst)) = *(reinterpret_cast<const WORD*> (src));
+ dst[2] = src[2];
+ break;
+
+ case 4: // FIT_BITMAP (32-bit) / FIT_UINT32 / FIT_INT32 / FIT_FLOAT
+ *(reinterpret_cast<DWORD*>(dst)) = *(reinterpret_cast<const DWORD*> (src));
+ break;
+
+ case 6: // FIT_RGB16 (3 x 16-bit)
+ *(reinterpret_cast<DWORD*>(dst)) = *(reinterpret_cast<const DWORD*> (src));
+ *(reinterpret_cast<WORD*>(dst + 4)) = *(reinterpret_cast<const WORD*> (src + 4));
+ break;
+
+ // the rest can be speeded up with int64
+
+ case 8: // FIT_RGBA16 (4 x 16-bit)
+ *(reinterpret_cast<DWORD*>(dst)) = *(reinterpret_cast<const DWORD*> (src));
+ *(reinterpret_cast<DWORD*>(dst + 4)) = *(reinterpret_cast<const DWORD*> (src + 4));
+ break;
+
+ case 12: // FIT_RGBF (3 x 32-bit IEEE floating point)
+ *(reinterpret_cast<float*>(dst)) = *(reinterpret_cast<const float*> (src));
+ *(reinterpret_cast<float*>(dst + 4)) = *(reinterpret_cast<const float*> (src + 4));
+ *(reinterpret_cast<float*>(dst + 8)) = *(reinterpret_cast<const float*> (src + 8));
+ break;
+
+ case 16: // FIT_RGBAF (4 x 32-bit IEEE floating point)
+ *(reinterpret_cast<float*>(dst)) = *(reinterpret_cast<const float*> (src));
+ *(reinterpret_cast<float*>(dst + 4)) = *(reinterpret_cast<const float*> (src + 4));
+ *(reinterpret_cast<float*>(dst + 8)) = *(reinterpret_cast<const float*> (src + 8));
+ *(reinterpret_cast<float*>(dst + 12)) = *(reinterpret_cast<const float*> (src + 12));
+ break;
+
+ default:
+ assert(FALSE);
+ }
+}
+
+/**
+Swap red and blue channels in a 24- or 32-bit dib.
+@return Returns TRUE if successful, returns FALSE otherwise
+@see See definition in Conversion.cpp
+*/
+BOOL SwapRedBlue32(FIBITMAP* dib);
+
+/**
+Inplace convert CMYK to RGBA.(8- and 16-bit).
+Alpha is filled with the first extra channel if any or white otherwise.
+@return Returns TRUE if successful, returns FALSE otherwise
+@see See definition in Conversion.cpp
+*/
+BOOL ConvertCMYKtoRGBA(FIBITMAP* dib);
+
+/**
+Inplace convert CIELab to RGBA (8- and 16-bit).
+@return Returns TRUE if successful, returns FALSE otherwise
+@see See definition in Conversion.cpp
+*/
+BOOL ConvertLABtoRGB(FIBITMAP* dib);
+
+/**
+RGBA to RGB conversion
+@see See definition in Conversion.cpp
+*/
+FIBITMAP* RemoveAlphaChannel(FIBITMAP* dib);
+
+
+// ==========================================================
+// Big Endian / Little Endian utility functions
+// ==========================================================
+
+inline WORD
+__SwapUInt16(WORD arg) {
+#if defined(_MSC_VER) && _MSC_VER >= 1310
+ return _byteswap_ushort(arg);
+#elif defined(__i386__) && defined(__GNUC__)
+ __asm__("xchgb %b0, %h0" : "+q" (arg));
+ return arg;
+#elif defined(__ppc__) && defined(__GNUC__)
+ WORD result;
+ __asm__("lhbrx %0,0,%1" : "=r" (result) : "r" (&arg), "m" (arg));
+ return result;
+#else
+ // swap bytes
+ WORD result;
+ result = ((arg << 8) & 0xFF00) | ((arg >> 8) & 0x00FF);
+ return result;
+#endif
+}
+
+inline DWORD
+__SwapUInt32(DWORD arg) {
+#if defined(_MSC_VER) && _MSC_VER >= 1310
+ return _byteswap_ulong(arg);
+#elif defined(__i386__) && defined(__GNUC__)
+ __asm__("bswap %0" : "+r" (arg));
+ return arg;
+#elif defined(__ppc__) && defined(__GNUC__)
+ DWORD result;
+ __asm__("lwbrx %0,0,%1" : "=r" (result) : "r" (&arg), "m" (arg));
+ return result;
+#else
+ // swap words then bytes
+ DWORD result;
+ result = ((arg & 0x000000FF) << 24) | ((arg & 0x0000FF00) << 8) | ((arg >> 8) & 0x0000FF00) | ((arg >> 24) & 0x000000FF);
+ return result;
+#endif
+}
+
+/**
+for later use ...
+inline uint64_t
+SwapInt64(uint64_t arg) {
+#if defined(_MSC_VER) && _MSC_VER >= 1310
+ return _byteswap_uint64(arg);
+#else
+ union Swap {
+ uint64_t sv;
+ uint32_t ul[2];
+ } tmp, result;
+ tmp.sv = arg;
+ result.ul[0] = SwapInt32(tmp.ul[1]);
+ result.ul[1] = SwapInt32(tmp.ul[0]);
+ return result.sv;
+#endif
+}
+*/
+
+inline void
+SwapShort(WORD *sp) {
+ *sp = __SwapUInt16(*sp);
+}
+
+inline void
+SwapLong(DWORD *lp) {
+ *lp = __SwapUInt32(*lp);
+}
+
+// ==========================================================
+// Greyscale and color conversion
+// ==========================================================
+
+/**
+Extract the luminance channel L from a RGBF image.
+Luminance is calculated from the sRGB model using a D65 white point, using the Rec.709 formula :
+L = ( 0.2126 * r ) + ( 0.7152 * g ) + ( 0.0722 * b )
+Reference :
+A Standard Default Color Space for the Internet - sRGB.
+[online] http://www.w3.org/Graphics/Color/sRGB
+*/
+#define LUMA_REC709(r, g, b) (0.2126F * r + 0.7152F * g + 0.0722F * b)
+
+#define GREY(r, g, b) (BYTE)LUMA_REC709(r, g, b)
+/*
+#define GREY(r, g, b) (BYTE)(((WORD)r * 77 + (WORD)g * 150 + (WORD)b * 29) >> 8) // .299R + .587G + .114B
+*/
+/*
+#define GREY(r, g, b) (BYTE)(((WORD)r * 169 + (WORD)g * 256 + (WORD)b * 87) >> 9) // .33R + 0.5G + .17B
+*/
+
+#define RGB565(b, g, r) ((((b) >> 3) << FI16_565_BLUE_SHIFT) | (((g) >> 2) << FI16_565_GREEN_SHIFT) | (((r) >> 3) << FI16_565_RED_SHIFT))
+#define RGB555(b, g, r) ((((b) >> 3) << FI16_555_BLUE_SHIFT) | (((g) >> 3) << FI16_555_GREEN_SHIFT) | (((r) >> 3) << FI16_555_RED_SHIFT))
+
+#define FORMAT_RGB565(dib) ((FreeImage_GetRedMask(dib) == FI16_565_RED_MASK) &&(FreeImage_GetGreenMask(dib) == FI16_565_GREEN_MASK) &&(FreeImage_GetBlueMask(dib) == FI16_565_BLUE_MASK))
+#define RGBQUAD_TO_WORD(dib, color) (FORMAT_RGB565(dib) ? RGB565((color)->rgbBlue, (color)->rgbGreen, (color)->rgbRed) : RGB555((color)->rgbBlue, (color)->rgbGreen, (color)->rgbRed))
+
+#define CREATE_GREYSCALE_PALETTE(palette, entries) \
+ for (unsigned i = 0, v = 0; i < entries; i++, v += 0x00FFFFFF / (entries - 1)) { \
+ ((unsigned *)palette)[i] = v; \
+ }
+
+#define CREATE_GREYSCALE_PALETTE_REVERSE(palette, entries) \
+ for (unsigned i = 0, v = 0x00FFFFFF; i < entries; i++, v -= (0x00FFFFFF / (entries - 1))) { \
+ ((unsigned *)palette)[i] = v; \
+ }
+
+// ==========================================================
+// Generic error messages
+// ==========================================================
+
+static const char *FI_MSG_ERROR_MEMORY = "Memory allocation failed";
+static const char *FI_MSG_ERROR_DIB_MEMORY = "DIB allocation failed, maybe caused by an invalid image size or by a lack of memory";
+static const char *FI_MSG_ERROR_PARSING = "Parsing error";
+static const char *FI_MSG_ERROR_MAGIC_NUMBER = "Invalid magic number";
+static const char *FI_MSG_ERROR_UNSUPPORTED_FORMAT = "Unsupported format";
+static const char *FI_MSG_ERROR_UNSUPPORTED_COMPRESSION = "Unsupported compression type";
+static const char *FI_MSG_WARNING_INVALID_THUMBNAIL = "Warning: attached thumbnail cannot be written to output file (invalid format) - Thumbnail saving aborted";
+
+#endif // UTILITIES_H
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