img.cc

kaffe Java 解释器语言,源码,Java的子集系统,开放源代码

/*
 * img.c - 
 *
 * Copyright (c) 1998
 *      Transvirtual Technologies, Inc.  All rights reserved.
 *
 * See the file "license.terms" for information on usage and redistribution 
 * of this file. 
 */

#include <stdio.h>

#include <qimage.h>

#include "toolkit.h"


/* interfaces of image conversion functions */
//Image* readGifFile ( int fd , char *fn);
//Image* readGifData ( unsigned char*, long len );
//Image* readJpegFile ( int fd );
//Image* readJpegData ( unsigned char*, long len );
//Image* readPngFile ( int fd );
//Image* readPngData ( unsigned char*, long len );

/************************************************************************************
 * own auxiliary funcs
 */

Image*
createImage ( int width, int height )
{
  Image * img = (Image*)AWT_CALLOC( 1, sizeof( Image));

  img->trans  = -1;     /* default to no alpha */

  img->width = width;   /* we need to (temp) store them for subsequent X image creation */
  img->height = height;

  return img;
}

#if 0
static int
createShmXImage ( Toolkit* X, Image* img, int depth, int isMask )
{
  return 0;
}


static void
destroyShmXImage ( Toolkit* X, Image* img, int isMask )
{
}
#endif


void
createXImage ( Toolkit* X, Image* img )
{
  int bitmap_pad;
  int bytes_per_line;
  int bytes_per_pix;
  unsigned int nPix;
  char *data;
#if 0
  Visual *vis  = DefaultVisual( X->dsp, DefaultScreen( X->dsp));
  int    depth = DefaultDepth(  X->dsp, DefaultScreen( X->dsp));
	
  if ( depth <= 8)	      bytes_per_pix = 1;
  else if ( depth <= 16)  bytes_per_pix = 2;
  else			          bytes_per_pix = 4;

  bytes_per_line = bytes_per_pix * img->width;
  bitmap_pad = bytes_per_pix * 8;
  nPix = img->width * img->height;

  if ( (X->shm == USE_SHM) && (nPix > X->shmThreshold) && (img->alpha == 0) ) {
	if ( createShmXImage( X, img, depth, False) ){
	  DBG( AWT_IMG, printf("alloc Shm: %p %p %p (%dx%d) \n", img, img->qImg, img->shmiImg,
					  img->width, img->height));
	  return;
	}
  }

  data = AWT_CALLOC( nPix, bytes_per_pix);
  img->xImg = XCreateImage( X->dsp, vis, depth, ZPixmap, 0,
							data, img->width, img->height, bitmap_pad, bytes_per_line);
#endif
  img->qImg = new QImage();
  DBG( AWT_IMG, printf( "alloc: %p %p (%dx%d)\n", img, img->qImg, img->width, img->height));
}

void
createXMaskImage ( Toolkit* X, Image* img )
{
  int     bytes_per_line;
  unsigned int nBytes, nPix;
  char    *data;
  //Visual  *vis = DefaultVisual( X->dsp, DefaultScreen( X->dsp));

  bytes_per_line = (img->width + 7) / 8;
  nPix   = img->width * img->height;
  nBytes = bytes_per_line * img->height;

#if 0
  if ( (X->shm == USE_SHM) && (nPix > X->shmThreshold) ) {
	if ( createShmXImage( X, img, 1, True) ){
	  DBG( AWT_IMG, printf( "alloc Shm mask: %p %p %p (%dx%d) \n", img, img->xMask, img->shmiMask,
					  img->width, img->height));
	  return;
	}
  }
#endif
  data = (char*)AWT_MALLOC( nBytes);
  memset( data, 0xff, nBytes);

  img->qImg_AlphaMask = new QImage();
//  img->xMask = XCreateImage( X->dsp, vis, 1, XYBitmap, 0,
//							 data, img->width, img->height, 8, bytes_per_line );
  DBG( AWT_IMG, printf( "alloc mask: %p %p (%dx%d)\n", img, img->qImg_AlphaMask, img->width, img->height));
}


void
createAlphaImage ( Toolkit* X, Image *img )
{
  int nBytes = img->width * img->height;

  img->alpha = (AlphaImage*)AWT_MALLOC( sizeof( AlphaImage));

  img->alpha->width  = img->width;
  img->alpha->height = img->height;
  img->alpha->buf = (unsigned char*)AWT_MALLOC( nBytes);
  memset( img->alpha->buf, 0xff, nBytes);
}

/*
 * For images with a full alpha channel, check if we really need an alpha byte for
 * each pel, or if a mask bitmap (alpha 0x00 / 0xff) will be sufficient
 */
int
needsFullAlpha ( Toolkit* X, Image *img, double threshold )
{
  int i, j, a;
  int n = 0, max;

  if ( !img->alpha ) return 0;

  max = (img->width * img->height) * threshold;

  for ( i=0; i<img->height; i++ ) {
	for ( j=0; j<img->width; j++ ) {
	  a = GetAlpha( img->alpha, j, i);
	  if ( (a != 0) && (a != 0xff) ) {
		if ( ++n > max )
		  return 1;
	  }
	}
  }

  return 0;
}

/*
 * A full alpha image channel is way slower than using a mask bitmap (= 0 / 0xff alpha).
 * This function provides a simple alpha-to-mask translation
 */
/* also used in imgpng */
void
reduceAlpha ( Toolkit* X, Image* img, int threshold )
{
  int i, j, a;

  if ( !img->alpha )
	return;

  //createXMaskImage( X, img);
  img->qImg->setAlphaBuffer(TRUE);
  *(img->qImg_AlphaMask) = img->qImg->createAlphaMask();

  for ( i=0; i<img->height; i++ ) {
	for ( j=0; j<img->width; j++ ) {
	  a = GetAlpha( img->alpha, j, i);
	  if ( a < threshold ) {
		//XPutPixel( img->xImg, j, i, 0);
		//XPutPixel( img->xMask, j, i, 0);
		
 		DBG( AWT_IMG, printf("reduce alpha! %d %d",img->qImg->width(),img->qImg->height()) );
		img->qImg->setPixel(j,i,0);
	  }
	}
  }

  AWT_FREE( img->alpha->buf);
  AWT_FREE( img->alpha);
  img->alpha = 0;
}

#if 0
static inline int
interpolate ( int ul, int ur, int ll, int lr, double dx, double dy )
{
  double u = ul + (double)(ur - ul) * dx;
  double l = ll + (double)(lr - ll) * dx;

  return (int) (u + (l - u) * dy  + 0.5);
}

static unsigned int
getScaledAlpha ( Toolkit* X, Image* img, int x, int y, double dx, double dy )
{
  int   ul, ur, ll, lr, a;
  int   xi = (dx) ? x+1 : x;
  int   yi = (dy) ? y+1 : y;

  if ( img->alpha ) {
	ul = GetAlpha( img->alpha, x, y);
	ur = GetAlpha( img->alpha, xi, y);
	ll = GetAlpha( img->alpha, x, yi);
	lr = GetAlpha( img->alpha, xi,yi);
	a = (unsigned int) interpolate( ul, ur, ll, lr, dx, dy);
	return a;
  }

  return 0xff;
}

static long
getScaledPixel ( Toolkit* X, Image* img, int x, int y, double dx, double dy )
{
  unsigned long  ul, ur, ll, lr;
  int            ulR, urR, llR, lrR, ulG, urG, llG, lrG, ulB, urB, llB, lrB, r, g, b;
  int            xi = (dx) ? x+1 : x;
  int            yi = (dy) ? y+1 : y;

  if ( img->xMask ) {
	ul = XGetPixel( img->xMask, x, y);
	ur = XGetPixel( img->xMask, xi, y);
	ll = XGetPixel( img->xMask, x, yi);
	lr = XGetPixel( img->xMask, xi,yi);
	
	if ( !interpolate( ul, ur, ll, lr, dx, dy) )
	  return -1;
  }

  ul = XGetPixel( img->xImg, x, y);
  ur = XGetPixel( img->xImg, xi, y);
  ll = XGetPixel( img->xImg, x, yi);
  lr = XGetPixel( img->xImg, xi,yi);


  if ( (ul == ur) && (ll == ul) && (lr == ll) ) {
//	rgbValues( X, ul, &r, &g, &b);
  }
  else {
//	rgbValues( X, ul, &ulR, &ulG, &ulB);
//	rgbValues( X, ur, &urR, &urG, &urB);
//	rgbValues( X, ll, &llR, &llG, &llB);
//	rgbValues( X, lr, &lrR, &lrG, &lrB);

	r = interpolate( ulR, urR, llR, lrR, dx, dy);
	g = interpolate( ulG, urG, llG, lrG, dx, dy);
	b = interpolate( ulB, urB, llB, lrB, dx, dy);
  }

//  return pixelValue( X, (r << 16) | (g << 8) | b);
  return 0;
}



void
initScaledImage ( Toolkit* X, Image *tgt, Image *src,
				  int dx0, int dy0, int dx1, int dy1,
				  int sx0, int sy0, int sx1, int sy1 )
{
  double         xScale, yScale, sX, sY, sxDelta, syDelta;
  int            dx, dy, dxInc, dyInc, sx, sy;
  long           c;

  dxInc = (dx1 > dx0) ? 1 : -1;
  dyInc = (dy1 > dy0) ? 1 : -1;

  dx1 += dxInc;
  dy1 += dyInc;

  xScale = (double) (dx1 - dx0) / (double) (sx1 - sx0 +1);
  yScale = (double) (dy1 - dy0) / (double) (sy1 - sy0 +1);

  for ( dy=dy0; dy != dy1; dy += dyInc ) {
	sY = sy0 + (dy - dy0) / yScale;
	sy = (int) sY;
	syDelta = (sy < sy1) ? sY - sy : 0;

	for ( dx=dx0; dx != dx1; dx += dxInc ) {
	  sX = sx0 + (dx - dx0) / xScale;
	  sx = (int) sX;
	  sxDelta = (sx < sx1) ? sX - sx : 0;

	  if ( (c = getScaledPixel( X, src, sx, sy, sxDelta, syDelta)) != -1 ){
  		XPutPixel( tgt->xImg, dx, dy, c);
		if                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              ( src->alpha )
		  PutAlpha( tgt->alpha, dx, dy, getScaledAlpha( X, src, sx, sy, sxDelta, syDelta));
	  }
	  else {
		XPutPixel( tgt->xMask, dx, dy, 0);
		XPutPixel( tgt->xImg, dx, dy, 0);
	  }
	}
  }
}
#endif

/************************************************************************************
 * exported native methods
 */


void*
Java_java_awt_Toolkit_imgCreateImage ( JNIEnv* env, jclass clazz, jint width, jint height )
{
  printf("imgCreateImage w=%d h=%d\n",(int)width,(int)height);
  Image *img = createImage( width, height);
  createXImage( X, img);
  return img;
}


void*
Java_java_awt_Toolkit_imgCreateScreenImage ( JNIEnv* env, jclass clazz, jint width, jint height )
{
  printf("imgCreateScreenImage w=%d h=%d\n",(int)width,(int)height);
  Image  *img = createImage( width, height);
  //int    depth = DefaultDepth(  X->dsp, DefaultScreen( X->dsp));

  //img->pix  = XCreatePixmap( X->dsp, X->root, width, height, depth);
  img->qpm = new QPixmap(width,height);
  return img;
}


/* generic (ImageProducer) based image construction */

void
Java_java_awt_Toolkit_imgSetIdxPels ( JNIEnv* env, jclass clazz, Image * img,
		jint x, jint y, jint w, jint h,
		jintArray clrMap, jbyteArray idxPels, jint trans,
		jint off, jint scan)
{
  printf("imgSetIdxPels\n");
  register int    row, col;
  unsigned long   pix;
  jint            rgb;
  jboolean        isCopy;
  jint            *clr = env->GetIntArrayElements( clrMap, &isCopy);
  jbyte           *pel = env->GetByteArrayElements( idxPels, &isCopy);
  unsigned char   *idx = (unsigned char*)(pel + off);
  int             maxCol = x + w;
  int             maxRow = y + h;
  unsigned char   curPel;

//  if ( (trans >= 0) && !img->xMask )
//	createXMaskImage( X, img);
  if ( (trans >= 0) && !img->qImg_AlphaMask)
	img->qImg_AlphaMask = new QImage();

  for ( row = y; row < maxRow; row++) {
    for ( col = x; col < maxCol; col++) {
      curPel = idx[col + row * scan];
      rgb = clr[curPel];
//      pix = pixelValue( X, rgb);
      if ( trans >= 0 ) {
		if ( curPel == trans ){
		  pix = 0;
		  //XPutPixel( img->xMask, col, row, 0);
		  img->qImg_AlphaMask->setPixel(col,row,0);
		}
      }
      //XPutPixel( img->xImg, col, row, pix);
      img->qImg->setPixel(col,row,rgb);
    }
  }

  env->ReleaseIntArrayElements( clrMap, clr, JNI_ABORT);
  env->ReleaseByteArrayElements( idxPels, pel, JNI_ABORT);
}


void
Java_java_awt_Toolkit_imgSetRGBPels ( JNIEnv* env, jclass clazz, Image * img,
									  jint x, jint y, jint w, jint h,
									  jintArray rgbPels, jint off, jint scan)
{
  printf("imgSetRGBPels\n");
  register int    row, col;
  unsigned long   pix = 0;
  jboolean        isCopy;
  jint            *rgbs = env->GetIntArrayElements( rgbPels, &isCopy);
  jint            *rgb = rgbs + off;
  int             maxCol = x + w;
  int             maxRow = y + h;
  jint		  val;

  for ( row = y; row < maxRow; row++) {
    for ( col = x; col < maxCol; col++) {
	  val = rgb[col + row * scan];
	  if ( (val & 0xff000000) == 0xff000000 ) {
//		pix = pixelValue( X, val);
		//XPutPixel( img->xImg, col, row, pix);
		img->qImg->setPixel(col,row,val);
	  }
	  else {
		/*
		 * No way to tell for now if this will be a reduced (on/off) or a
		 * full alpha channel. We have to be prepared for the "worst", and reduce
		 * later
		 */
		if ( !img->alpha )