PXL/PXL_Common.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * Produced by:
 *      Mark Alexander
 *      Side Effects Software Inc
 *      123 Front Street 
 *      Toronto, Ontario
 *      Canada   M5V 3E7
 *      416-504-9876
 *
 * NAME:        PXL_Defines.h   (Pixel Library, C++)
 *
 * COMMENTS:
 *      
 */
#ifndef PXL_DEFINES_H
#define PXL_DEFINES_H

#include <limits.h>
#include "PXL_API.h"

enum PXL_DataFormat
{
    PXL_INT8 = 0,
    PXL_INT16,
    PXL_INT32,
    PXL_FLOAT32,
    PXL_FLOAT16,
    PXL_MAX_DATA_FORMAT
};

enum PXL_Packing
{
    PACK_SINGLE =0,     // single channel
    PACK_DUAL,          // 2 channel interleaved + 1 black channel. (12B12B). 
    PACK_DUAL_NI,       // 2 channel, non-interleaved (11111....12222222...2)
    PACK_RGB,           // RGB interleaved (rgbrgb...rgb)
    PACK_RGBA,          // RGBA interleaved 
    PACK_RGB_NI,        // RGB non-interleaved (rrr...rggg...gbbb..b)
    PACK_RGBA_NI,       // RGBA non-interleaved
    
    PACK_UNKNOWN = 255
};


#define PXL_WHITE_8             UCHAR_MAX
#define PXL_WHITE_16            USHRT_MAX
#define PXL_WHITE_32            UINT_MAX

PXL_API extern const int pxlDefinesDepth[6];
PXL_API extern const int pxlDefinesPComp[256];
PXL_API extern const int pxlDefinesPDepth[256];
PXL_API extern const unsigned int pxlDefinesWhite[6];

inline int PXLformatDepth(PXL_DataFormat d)
        { return pxlDefinesDepth[(int) d]; }

inline int PXLpackingComponents(PXL_Packing p)
        { return pxlDefinesPComp[(int) p]; }
    
inline int PXLpackingDepth(PXL_Packing p)
        { return pxlDefinesPDepth[(int) p]; }

inline unsigned int PXLwhitePoint(PXL_DataFormat dt)
        { return pxlDefinesWhite[ (int) dt]; }


// must be called before the following 3 CPU flag checks.
PXL_API void            PXLdetermineProcCaps();
PXL_API bool            PXLcpuHasMMX();
PXL_API int             PXLcpuHasSSE();
PXL_API bool            PXLcpuHasXMMX();
PXL_API bool            PXLcpuHasCondMov();

inline int PXLclampChar(int t)
{
#if defined(LINUX) && !defined(IA64) && !defined(AMD64) && !defined(PPC)
    __asm__ __volatile__ (
        "xor   %%ebx, %%ebx     \n"
        "mov   $255, %%ecx      \n"
        "cmp   $0, %%eax        \n"
        "cmovs %%ebx, %%eax     \n"
        "cmp   $255, %%eax      \n"
        "cmova %%ecx, %%eax     \n"
        : "=a" (t) : "a" (t) : "%ebx", "%ecx" );
#else   
    if(t < 0)
        t = 0;
    else if(t > 255)
        t = 255;
#endif

    return t;
}

inline int PXLclampShort(int t)
{
#if defined(LINUX) && !defined(IA64) && !defined(AMD64) && !defined(PPC)
    __asm__ __volatile__ (
        "xor   %%ebx, %%ebx     \n"
        "mov   $65535, %%ecx    \n"
        "cmp   $0, %%eax        \n"
        "cmovs %%ebx, %%eax     \n"
        "cmp   $65535, %%eax    \n"
        "cmova %%ecx, %%eax     \n"
        : "=a" (t) : "a" (t) : "%ebx", "%ecx" );
#else   
    if(t < 0)
        t = 0;
    else if(t > 65535)
        t = 65535;
#endif
    return t;
}


#endif

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