splash.cc

swf文件查看工具,能够看flash文件的格式

//========================================================================
//
// Splash.cc
//
//========================================================================

#include <aconf.h>

#ifdef USE_GCC_PRAGMAS
#pragma implementation
#endif

#include <stdlib.h>
#include <string.h>
#include "gmem.h"
#include "SplashErrorCodes.h"
#include "SplashMath.h"
#include "SplashBitmap.h"
#include "SplashState.h"
#include "SplashPath.h"
#include "SplashXPath.h"
#include "SplashXPathScanner.h"
#include "SplashPattern.h"
#include "SplashScreen.h"
#include "SplashFont.h"
#include "SplashGlyphBitmap.h"
#include "Splash.h"

//------------------------------------------------------------------------

// distance of Bezier control point from center for circle approximation
// = (4 * (sqrt(2) - 1) / 3) * r
#define bezierCircle ((SplashCoord)0.55228475)
#define bezierCircle2 ((SplashCoord)(0.5 * 0.55228475))

// Divide a 16-bit value (in [0, 255*255]) by 255, returning an 8-bit result.
static inline Guchar div255(int x) {
  return (Guchar)((x + (x >> 8) + 0x80) >> 8);
}

//------------------------------------------------------------------------
// SplashPipe
//------------------------------------------------------------------------

#define splashPipeMaxStages 9

struct SplashPipe {
  // pixel coordinates
  int x, y;

  // source pattern
  SplashPattern *pattern;

  // source alpha and color
  SplashCoord aInput;
  GBool usesShape;
  Guchar aSrc;
  SplashColorPtr cSrc;
  SplashColor cSrcVal;

  // non-isolated group alpha0
  Guchar *alpha0Ptr;

  // soft mask
  SplashColorPtr softMaskPtr;

  // destination alpha and color
  SplashColorPtr destColorPtr;
  int destColorMask;
  Guchar *destAlphaPtr;

  // shape
  SplashCoord shape;

  // result alpha and color
  GBool noTransparency;
  SplashPipeResultColorCtrl resultColorCtrl;

  // non-isolated group correction
  int nonIsolatedGroup;
};

SplashPipeResultColorCtrl Splash::pipeResultColorNoAlphaBlend[] = {
  splashPipeResultColorNoAlphaBlendMono,
  splashPipeResultColorNoAlphaBlendMono,
  splashPipeResultColorNoAlphaBlendRGB,
  splashPipeResultColorNoAlphaBlendRGB
#if SPLASH_CMYK
  ,
  splashPipeResultColorNoAlphaBlendCMYK
#endif
};

SplashPipeResultColorCtrl Splash::pipeResultColorAlphaNoBlend[] = {
  splashPipeResultColorAlphaNoBlendMono,
  splashPipeResultColorAlphaNoBlendMono,
  splashPipeResultColorAlphaNoBlendRGB,
  splashPipeResultColorAlphaNoBlendRGB
#if SPLASH_CMYK
  ,
  splashPipeResultColorAlphaNoBlendCMYK
#endif
};

SplashPipeResultColorCtrl Splash::pipeResultColorAlphaBlend[] = {
  splashPipeResultColorAlphaBlendMono,
  splashPipeResultColorAlphaBlendMono,
  splashPipeResultColorAlphaBlendRGB,
  splashPipeResultColorAlphaBlendRGB
#if SPLASH_CMYK
  ,
  splashPipeResultColorAlphaBlendCMYK
#endif
};

//------------------------------------------------------------------------

static void blendXor(SplashColorPtr src, SplashColorPtr dest,
		     SplashColorPtr blend, SplashColorMode cm) {
  int i;

  for (i = 0; i < splashColorModeNComps[cm]; ++i) {
    blend[i] = src[i] ^ dest[i];
  }
}

//------------------------------------------------------------------------
// modified region
//------------------------------------------------------------------------

void Splash::clearModRegion() {
  modXMin = bitmap->getWidth();
  modYMin = bitmap->getHeight();
  modXMax = -1;
  modYMax = -1;
}

inline void Splash::updateModX(int x) {
  if (x < modXMin) {
    modXMin = x;
  }
  if (x > modXMax) {
    modXMax = x;
  }
}

inline void Splash::updateModY(int y) {
  if (y < modYMin) {
    modYMin = y;
  }
  if (y > modYMax) {
    modYMax = y;
  }
}

//------------------------------------------------------------------------
// pipeline
//------------------------------------------------------------------------

inline void Splash::pipeInit(SplashPipe *pipe, int x, int y,
			     SplashPattern *pattern, SplashColorPtr cSrc,
			     SplashCoord aInput, GBool usesShape,
			     GBool nonIsolatedGroup) {
  pipeSetXY(pipe, x, y);
  pipe->pattern = NULL;

  // source color
  if (pattern) {
    if (pattern->isStatic()) {
      pattern->getColor(x, y, pipe->cSrcVal);
    } else {
      pipe->pattern = pattern;
    }
    pipe->cSrc = pipe->cSrcVal;
  } else {
    pipe->cSrc = cSrc;
  }

  // source alpha
  pipe->aInput = aInput;
  if (!state->softMask) {
    if (usesShape) {
      pipe->aInput *= 255;
    } else {
      pipe->aSrc = (Guchar)splashRound(pipe->aInput * 255);
    }
  }
  pipe->usesShape = usesShape;

  // result alpha
  if (aInput == 1 && !state->softMask && !usesShape &&
      !state->inNonIsolatedGroup) {
    pipe->noTransparency = gTrue;
  } else {
    pipe->noTransparency = gFalse;
  }

  // result color
  if (pipe->noTransparency) {
    // the !state->blendFunc case is handled separately in pipeRun
    pipe->resultColorCtrl = pipeResultColorNoAlphaBlend[bitmap->mode];
  } else if (!state->blendFunc) {
    pipe->resultColorCtrl = pipeResultColorAlphaNoBlend[bitmap->mode];
  } else {
    pipe->resultColorCtrl = pipeResultColorAlphaBlend[bitmap->mode];
  }

  // non-isolated group correction
  if (nonIsolatedGroup) {
    pipe->nonIsolatedGroup = splashColorModeNComps[bitmap->mode];
  } else {
    pipe->nonIsolatedGroup = 0;
  }
}

inline void Splash::pipeRun(SplashPipe *pipe) {
  Guchar aSrc, aDest, alpha2, alpha0, aResult;
  SplashColor cDest, cBlend;
  Guchar cResult0, cResult1, cResult2, cResult3;

  //----- source color

  // static pattern: handled in pipeInit
  // fixed color: handled in pipeInit

  // dynamic pattern
  if (pipe->pattern) {
    pipe->pattern->getColor(pipe->x, pipe->y, pipe->cSrcVal);
  }

  if (pipe->noTransparency && !state->blendFunc) {

    //----- write destination pixel

    switch (bitmap->mode) {
    case splashModeMono1:
      cResult0 = pipe->cSrc[0];
      if (state->screen->test(pipe->x, pipe->y, cResult0)) {
	*pipe->destColorPtr |= pipe->destColorMask;
      } else {
	*pipe->destColorPtr &= ~pipe->destColorMask;
      }
      if (!(pipe->destColorMask >>= 1)) {
	pipe->destColorMask = 0x80;
	++pipe->destColorPtr;
      }
      break;
    case splashModeMono8:
      *pipe->destColorPtr++ = pipe->cSrc[0];
      break;
    case splashModeRGB8:
      *pipe->destColorPtr++ = pipe->cSrc[0];
      *pipe->destColorPtr++ = pipe->cSrc[1];
      *pipe->destColorPtr++ = pipe->cSrc[2];
      break;
    case splashModeBGR8:
      *pipe->destColorPtr++ = pipe->cSrc[2];
      *pipe->destColorPtr++ = pipe->cSrc[1];
      *pipe->destColorPtr++ = pipe->cSrc[0];
      break;
#if SPLASH_CMYK
    case splashModeCMYK8:
      *pipe->destColorPtr++ = pipe->cSrc[0];
      *pipe->destColorPtr++ = pipe->cSrc[1];
      *pipe->destColorPtr++ = pipe->cSrc[2];
      *pipe->destColorPtr++ = pipe->cSrc[3];
      break;
#endif
    }
    if (pipe->destAlphaPtr) {
      *pipe->destAlphaPtr++ = 255;
    }

  } else {

    //----- read destination pixel

    switch (bitmap->mode) {
    case splashModeMono1:
      cDest[0] = (*pipe->destColorPtr & pipe->destColorMask) ? 0xff : 0x00;
      break;
    case splashModeMono8:
      cDest[0] = *pipe->destColorPtr;
      break;
    case splashModeRGB8:
      cDest[0] = pipe->destColorPtr[0];
      cDest[1] = pipe->destColorPtr[1];
      cDest[2] = pipe->destColorPtr[2];
      break;
    case splashModeBGR8:
      cDest[0] = pipe->destColorPtr[2];
      cDest[1] = pipe->destColorPtr[1];
      cDest[2] = pipe->destColorPtr[0];
      break;
#if SPLASH_CMYK
    case splashModeCMYK8:
      cDest[0] = pipe->destColorPtr[0];
      cDest[1] = pipe->destColorPtr[1];
      cDest[2] = pipe->destColorPtr[2];
      cDest[3] = pipe->destColorPtr[3];
      break;
#endif
    }
    if (pipe->destAlphaPtr) {
      aDest = *pipe->destAlphaPtr;
    } else {
      aDest = 0xff;
    }

    //----- blend function

    if (state->blendFunc) {
      (*state->blendFunc)(pipe->cSrc, cDest, cBlend, bitmap->mode);
    }

    //----- source alpha

    if (state->softMask) {
      if (pipe->usesShape) {
	aSrc = (Guchar)splashRound(pipe->aInput * *pipe->softMaskPtr++
				   * pipe->shape);
      } else {
	aSrc = (Guchar)splashRound(pipe->aInput * *pipe->softMaskPtr++);
      }
    } else if (pipe->usesShape) {
      // pipe->aInput is premultiplied by 255 in pipeInit
      aSrc = (Guchar)splashRound(pipe->aInput * pipe->shape);
    } else {
      // precomputed in pipeInit
      aSrc = pipe->aSrc;
    }

    //----- result alpha and non-isolated group element correction

    if (pipe->noTransparency) {
      alpha2 = aResult = 255;
    } else {
      aResult = aSrc + aDest - div255(aSrc * aDest);

      if (pipe->alpha0Ptr) {
	alpha0 = *pipe->alpha0Ptr++;
	alpha2 = aResult + alpha0 - div255(aResult * alpha0);
      } else {
	alpha2 = aResult;
      }
    }

    //----- result color

    cResult0 = cResult1 = cResult2 = cResult3 = 0; // make gcc happy

    switch (pipe->resultColorCtrl) {

#if SPLASH_CMYK
    case splashPipeResultColorNoAlphaBlendCMYK:
      cResult3 = div255((255 - aDest) * pipe->cSrc[3] + aDest * cBlend[3]);
#endif
    case splashPipeResultColorNoAlphaBlendRGB:
      cResult2 = div255((255 - aDest) * pipe->cSrc[2] + aDest * cBlend[2]);
      cResult1 = div255((255 - aDest) * pipe->cSrc[1] + aDest * cBlend[1]);
    case splashPipeResultColorNoAlphaBlendMono:
      cResult0 = div255((255 - aDest) * pipe->cSrc[0] + aDest * cBlend[0]);
      break;

    case splashPipeResultColorAlphaNoBlendMono:
      if (alpha2 == 0) {
	cResult0 = 0;
      } else {
	cResult0 = (Guchar)(((alpha2 - aSrc) * cDest[0] +
			     aSrc * pipe->cSrc[0]) / alpha2);
      }
      break;
    case splashPipeResultColorAlphaNoBlendRGB:
      if (alpha2 == 0) {
	cResult0 = 0;
	cResult1 = 0;
	cResult2 = 0;
      } else {
	cResult0 = (Guchar)(((alpha2 - aSrc) * cDest[0] +
			     aSrc * pipe->cSrc[0]) / alpha2);
	cResult1 = (Guchar)(((alpha2 - aSrc) * cDest[1] +
			     aSrc * pipe->cSrc[1]) / alpha2);
	cResult2 = (Guchar)(((alpha2 - aSrc) * cDest[2] +
			     aSrc * pipe->cSrc[2]) / alpha2);
      }
      break;
#if SPLASH_CMYK
    case splashPipeResultColorAlphaNoBlendCMYK:
      if (alpha2 == 0) {
	cResult0 = 0;
	cResult1 = 0;
	cResult2 = 0;
	cResult3 = 0;
      } else {
	cResult0 = (Guchar)(((alpha2 - aSrc) * cDest[0] +
			     aSrc * pipe->cSrc[0]) / alpha2);
	cResult1 = (Guchar)(((alpha2 - aSrc) * cDest[1] +
			     aSrc * pipe->cSrc[1]) / alpha2);
	cResult2 = (Guchar)(((alpha2 - aSrc) * cDest[2] +
			     aSrc * pipe->cSrc[2]) / alpha2);
	cResult3 = (Guchar)(((alpha2 - aSrc) * cDest[3] +
			     aSrc * pipe->cSrc[3]) / alpha2);
      }
      break;
#endif

    case splashPipeResultColorAlphaBlendMono:
      if (alpha2 == 0) {
	cResult0 = 0;
      } else {
	cResult0 = (Guchar)(((alpha2 - aSrc) * cDest[0] +
			     aSrc * ((255 - aDest) * pipe->cSrc[0] +
				     aDest * cBlend[0]) / 255) /
			    alpha2);
      }
      break;
    case splashPipeResultColorAlphaBlendRGB:
      if (alpha2 == 0) {
	cResult0 = 0;
	cResult1 = 0;
	cResult2 = 0;
      } else {
	cResult0 = (Guchar)(((alpha2 - aSrc) * cDest[0] +
			     aSrc * ((255 - aDest) * pipe->cSrc[0] +
				     aDest * cBlend[0]) / 255) /
			    alpha2);
	cResult1 = (Guchar)(((alpha2 - aSrc) * cDest[1] +
			     aSrc * ((255 - aDest) * pipe->cSrc[1] +
				     aDest * cBlend[1]) / 255) /
			    alpha2);
	cResult2 = (Guchar)(((alpha2 - aSrc) * cDest[2] +
			     aSrc * ((255 - aDest) * pipe->cSrc[2] +
				     aDest * cBlend[2]) / 255) /
			    alpha2);
      }
      break;
#if SPLASH_CMYK
    case splashPipeResultColorAlphaBlendCMYK:
      if (alpha2 == 0) {
	cResult0 = 0;
	cResult1 = 0;
	cResult2 = 0;
	cResult3 = 0;
      } else {
	cResult0 = (Guchar)(((alpha2 - aSrc) * cDest[0] +
			     aSrc * ((255 - aDest) * pipe->cSrc[0] +
				     aDest * cBlend[0]) / 255) /
			    alpha2);
	cResult1 = (Guchar)(((alpha2 - aSrc) * cDest[1] +
			     aSrc * ((255 - aDest) * pipe->cSrc[1] +
				     aDest * cBlend[1]) / 255) /
			    alpha2);
	cResult2 = (Guchar)(((alpha2 - aSrc) * cDest[2] +
			     aSrc * ((255 - aDest) * pipe->cSrc[2] +
				     aDest * cBlend[2]) / 255) /
			    alpha2);
	cResult3 = (Guchar)(((alpha2 - aSrc) * cDest[3] +
			     aSrc * ((255 - aDest) * pipe->cSrc[3] +
				     aDest * cBlend[3]) / 255) /
			    alpha2);
      }
      break;
#endif
    }

    //----- non-isolated group correction

    if (aResult != 0) {
      switch (pipe->nonIsolatedGroup) {
#if SPLASH_CMYK
      case 4:
	cResult3 += (cResult3 - cDest[3]) * aDest *
	            (255 - aResult) / (255 * aResult);
#endif
      case 3:
	cResult2 += (cResult2 - cDest[2]) * aDest *
	            (255 - aResult) / (255 * aResult);
	cResult1 += (cResult1 - cDest[1]) * aDest *
	            (255 - aResult) / (255 * aResult);
      case 1:
	cResult0 += (cResult0 - cDest[0]) * aDest *
	            (255 - aResult) / (255 * aResult);
      case 0:
	break;
      }
    }

    //----- write destination pixel

    switch (bitmap->mode) {
    case splashModeMono1:
      if (state->screen->test(pipe->x, pipe->y, cResult0)) {
	*pipe->destColorPtr |= pipe->destColorMask;
      } else {
	*pipe->destColorPtr &= ~pipe->destColorMask;
      }
      if (!(pipe->destColorMask >>= 1)) {
	pipe->destColorMask = 0x80;
	++pipe->destColorPtr;
      }
      break;
    case splashModeMono8:
      *pipe->destColorPtr++ = cResult0;
      break;
    case splashModeRGB8: