bool Q_INTERNAL_WIN_NO_THROW QPngHandlerPrivate::readPngImage(QImage *outImage)
{
if (state == Error)
return false;
if (state == Ready && !readPngHeader()) {
state = Error;
return false;
}
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
png_ptr = 0;
amp.deallocate();
state = Error;
return false;
}
bool doScaledRead = false;
setup_qt(*outImage, png_ptr, info_ptr, scaledSize, &doScaledRead, gamma, fileGamma);
if (outImage->isNull()) {
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
png_ptr = 0;
amp.deallocate();
state = Error;
return false;
}
if (doScaledRead) {
read_image_scaled(outImage, png_ptr, info_ptr, amp, scaledSize);
} else {
png_uint_32 width = 0;
png_uint_32 height = 0;
png_int_32 offset_x = 0;
png_int_32 offset_y = 0;
int bit_depth = 0;
int color_type = 0;
int unit_type = PNG_OFFSET_PIXEL;
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, 0, 0, 0);
png_get_oFFs(png_ptr, info_ptr, &offset_x, &offset_y, &unit_type);
uchar *data = outImage->bits();
int bpl = outImage->bytesPerLine();
amp.row_pointers = new png_bytep[height];
for (uint y = 0; y < height; y++)
amp.row_pointers[y] = data + y * bpl;
png_read_image(png_ptr, amp.row_pointers);
amp.deallocate();
outImage->setDotsPerMeterX(png_get_x_pixels_per_meter(png_ptr,info_ptr));
outImage->setDotsPerMeterY(png_get_y_pixels_per_meter(png_ptr,info_ptr));
if (unit_type == PNG_OFFSET_PIXEL)
outImage->setOffset(QPoint(offset_x, offset_y));
// sanity check palette entries
if (color_type == PNG_COLOR_TYPE_PALETTE && outImage->format() == QImage::Format_Indexed8) {
int color_table_size = outImage->colorCount();
for (int y=0; y<(int)height; ++y) {
uchar *p = FAST_SCAN_LINE(data, bpl, y);
uchar *end = p + width;
while (p < end) {
if (*p >= color_table_size)
*p = 0;
++p;
}
}
}
}
state = ReadingEnd;
png_read_end(png_ptr, end_info);
readPngTexts(end_info);
for (int i = 0; i < readTexts.size()-1; i+=2)
outImage->setText(readTexts.at(i), readTexts.at(i+1));
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
png_ptr = 0;
amp.deallocate();
state = Ready;
if (scaledSize.isValid() && outImage->size() != scaledSize)
*outImage = outImage->scaled(scaledSize, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
return true;
}
/*!
This function decodes some data into image changes.
Returns the number of bytes consumed.
*/
int QGIFFormat::decode(QImage *image, const uchar *buffer, int length,
int *nextFrameDelay, int *loopCount)
{
// We are required to state that
// "The Graphics Interchange Format(c) is the Copyright property of
// CompuServe Incorporated. GIF(sm) is a Service Mark property of
// CompuServe Incorporated."
if (!stack) {
stack = new short[(1 << max_lzw_bits) * 4];
table[0] = &stack[(1 << max_lzw_bits) * 2];
table[1] = &stack[(1 << max_lzw_bits) * 3];
}
image->detach();
int bpl = image->bytesPerLine();
unsigned char *bits = image->bits();
#define LM(l, m) (((m)<<8)|l)
digress = false;
const int initial = length;
while (!digress && length) {
length--;
unsigned char ch=*buffer++;
switch (state) {
case Header:
hold[count++]=ch;
if (count==6) {
// Header
gif89=(hold[3]!='8' || hold[4]!='7');
state=LogicalScreenDescriptor;
count=0;
}
break;
case LogicalScreenDescriptor:
hold[count++]=ch;
if (count==7) {
// Logical Screen Descriptor
swidth=LM(hold[0], hold[1]);
sheight=LM(hold[2], hold[3]);
gcmap=!!(hold[4]&0x80);
//UNUSED: bpchan=(((hold[4]&0x70)>>3)+1);
//UNUSED: gcmsortflag=!!(hold[4]&0x08);
gncols=2<<(hold[4]&0x7);
bgcol=(gcmap) ? hold[5] : -1;
//aspect=hold[6] ? double(hold[6]+15)/64.0 : 1.0;
trans_index = -1;
count=0;
ncols=gncols;
if (gcmap) {
ccount=0;
state=GlobalColorMap;
globalcmap = new QRgb[gncols+1]; // +1 for trans_index
globalcmap[gncols] = Q_TRANSPARENT;
} else {
state=Introducer;
}
}
break;
case GlobalColorMap: case LocalColorMap:
hold[count++]=ch;
if (count==3) {
QRgb rgb = qRgb(hold[0], hold[1], hold[2]);
if (state == LocalColorMap) {
if (ccount < lncols)
localcmap[ccount] = rgb;
} else {
globalcmap[ccount] = rgb;
}
if (++ccount >= ncols) {
if (state == LocalColorMap)
state=TableImageLZWSize;
else
state=Introducer;
}
count=0;
}
break;
case Introducer:
hold[count++]=ch;
switch (ch) {
case ',':
state=ImageDescriptor;
break;
case '!':
state=ExtensionLabel;
break;
case ';':
// ### Changed: QRect(0, 0, swidth, sheight)
state=Done;
break;
default:
digress=true;
// Unexpected Introducer - ignore block
state=Error;
}
break;
case ImageDescriptor:
hold[count++]=ch;
if (count==10) {
int newleft=LM(hold[1], hold[2]);
int newtop=LM(hold[3], hold[4]);
int newwidth=LM(hold[5], hold[6]);
int newheight=LM(hold[7], hold[8]);
// disbelieve ridiculous logical screen sizes,
// unless the image frames are also large.
if (swidth/10 > qMax(newwidth,200))
swidth = -1;
if (sheight/10 > qMax(newheight,200))
sheight = -1;
if (swidth <= 0)
swidth = newleft + newwidth;
if (sheight <= 0)
sheight = newtop + newheight;
QImage::Format format = trans_index >= 0 ? QImage::Format_ARGB32 : QImage::Format_RGB32;
if (image->isNull()) {
(*image) = QImage(swidth, sheight, format);
bpl = image->bytesPerLine();
bits = image->bits();
memset(bits, 0, image->byteCount());
}
// Check if the previous attempt to create the image failed. If it
// did then the image is broken and we should give up.
if (image->isNull()) {
state = Error;
return -1;
}
disposePrevious(image);
disposed = false;
left = newleft;
top = newtop;
width = newwidth;
height = newheight;
right=qMax(0, qMin(left+width, swidth)-1);
bottom=qMax(0, qMin(top+height, sheight)-1);
lcmap=!!(hold[9]&0x80);
interlace=!!(hold[9]&0x40);
//bool lcmsortflag=!!(hold[9]&0x20);
lncols=lcmap ? (2<<(hold[9]&0x7)) : 0;
if (lncols) {
if (localcmap)
delete [] localcmap;
localcmap = new QRgb[lncols+1];
localcmap[lncols] = Q_TRANSPARENT;
ncols = lncols;
} else {
ncols = gncols;
}
frame++;
if (frame == 0) {
if (left || top || width<swidth || height<sheight) {
// Not full-size image - erase with bg or transparent
if (trans_index >= 0) {
fillRect(image, 0, 0, swidth, sheight, color(trans_index));
// ### Changed: QRect(0, 0, swidth, sheight)
} else if (bgcol>=0) {
fillRect(image, 0, 0, swidth, sheight, color(bgcol));
// ### Changed: QRect(0, 0, swidth, sheight)
}
}
}
if (disposal == RestoreImage) {
int l = qMin(swidth-1,left);
int r = qMin(swidth-1,right);
int t = qMin(sheight-1,top);
int b = qMin(sheight-1,bottom);
int w = r-l+1;
int h = b-t+1;
if (backingstore.width() < w
|| backingstore.height() < h) {
// We just use the backing store as a byte array
backingstore = QImage(qMax(backingstore.width(), w),
qMax(backingstore.height(), h),
QImage::Format_RGB32);
memset(bits, 0, image->byteCount());
}
const int dest_bpl = backingstore.bytesPerLine();
unsigned char *dest_data = backingstore.bits();
for (int ln=0; ln<h; ln++) {
memcpy(FAST_SCAN_LINE(dest_data, dest_bpl, ln),
FAST_SCAN_LINE(bits, bpl, t+ln) + l, w*sizeof(QRgb));
}
}
count=0;
if (lcmap) {
ccount=0;
state=LocalColorMap;
} else {
state=TableImageLZWSize;
}
x = left;
y = top;
accum = 0;
bitcount = 0;
sp = stack;
firstcode = oldcode = 0;
needfirst = true;
out_of_bounds = left>=swidth || y>=sheight;
}
break;
case TableImageLZWSize: {
lzwsize=ch;
if (lzwsize > max_lzw_bits) {
state=Error;
} else {
code_size=lzwsize+1;
clear_code=1<<lzwsize;
end_code=clear_code+1;
max_code_size=2*clear_code;
max_code=clear_code+2;
int i;
for (i=0; i<clear_code; i++) {
table[0][i]=0;
table[1][i]=i;
}
state=ImageDataBlockSize;
}
count=0;
break;
} case ImageDataBlockSize:
expectcount=ch;
if (expectcount) {
state=ImageDataBlock;
} else {
state=Introducer;
digress = true;
newFrame = true;
}
break;
case ImageDataBlock:
count++;
accum|=(ch<<bitcount);
bitcount+=8;
while (bitcount>=code_size && state==ImageDataBlock) {
int code=accum&((1<<code_size)-1);
bitcount-=code_size;
accum>>=code_size;
if (code==clear_code) {
if (!needfirst) {
code_size=lzwsize+1;
max_code_size=2*clear_code;
max_code=clear_code+2;
}
needfirst=true;
} else if (code==end_code) {
bitcount = -32768;
// Left the block end arrive
} else {
if (needfirst) {
firstcode=oldcode=code;
if (!out_of_bounds && image->height() > y && ((frame == 0) || (firstcode != trans_index)))
((QRgb*)FAST_SCAN_LINE(bits, bpl, y))[x] = color(firstcode);
x++;
if (x>=swidth) out_of_bounds = true;
needfirst=false;
if (x>=left+width) {
x=left;
out_of_bounds = left>=swidth || y>=sheight;
nextY(bits, bpl);
}
} else {
incode=code;
if (code>=max_code) {
*sp++=firstcode;
code=oldcode;
}
while (code>=clear_code+2) {
if (code >= max_code) {
state = Error;
return -1;
}
*sp++=table[1][code];
if (code==table[0][code]) {
state=Error;
return -1;
}
if (sp-stack>=(1<<(max_lzw_bits))*2) {
state=Error;
return -1;
}
code=table[0][code];
}
if (code < 0) {
state = Error;
return -1;
}
*sp++=firstcode=table[1][code];
code=max_code;
if (code<(1<<max_lzw_bits)) {
table[0][code]=oldcode;
table[1][code]=firstcode;
max_code++;
if ((max_code>=max_code_size)
&& (max_code_size<(1<<max_lzw_bits)))
{
max_code_size*=2;
code_size++;
}
}
oldcode=incode;
const int h = image->height();
QRgb *line = 0;
if (!out_of_bounds && h > y)
line = (QRgb*)FAST_SCAN_LINE(bits, bpl, y);
while (sp>stack) {
const uchar index = *(--sp);
if (!out_of_bounds && h > y && ((frame == 0) || (index != trans_index))) {
line[x] = color(index);
}
x++;
if (x>=swidth) out_of_bounds = true;
if (x>=left+width) {
x=left;
out_of_bounds = left>=swidth || y>=sheight;
nextY(bits, bpl);
if (!out_of_bounds && h > y)
line = (QRgb*)FAST_SCAN_LINE(bits, bpl, y);
}
}
}
}
}
partialNewFrame = true;
if (count==expectcount) {
count=0;
state=ImageDataBlockSize;
}
break;
case ExtensionLabel:
switch (ch) {
case 0xf9:
state=GraphicControlExtension;
break;
case 0xff:
state=ApplicationExtension;
break;
#if 0
case 0xfe:
state=CommentExtension;
break;
case 0x01:
break;
#endif
default:
state=SkipBlockSize;
}
count=0;
break;
case ApplicationExtension:
if (count<11) hold[count]=ch;
count++;
if (count==hold[0]+1) {
if (qstrncmp((char*)(hold+1), "NETSCAPE", 8)==0) {
// Looping extension
state=NetscapeExtensionBlockSize;
} else {
state=SkipBlockSize;
}
count=0;
}
break;
case NetscapeExtensionBlockSize:
expectcount=ch;
count=0;
if (expectcount) state=NetscapeExtensionBlock;
else state=Introducer;
break;
case NetscapeExtensionBlock:
if (count<3) hold[count]=ch;
count++;
if (count==expectcount) {
*loopCount = hold[1]+hold[2]*256;
state=SkipBlockSize; // Ignore further blocks
}
break;
case GraphicControlExtension:
if (count<5) hold[count]=ch;
count++;
if (count==hold[0]+1) {
disposePrevious(image);
disposal=Disposal((hold[1]>>2)&0x7);
//UNUSED: waitforuser=!!((hold[1]>>1)&0x1);
int delay=count>3 ? LM(hold[2], hold[3]) : 1;
// IE and mozilla use a minimum delay of 10. With the minimum delay of 10
// we are compatible to them and avoid huge loads on the app and xserver.
*nextFrameDelay = (delay < 2 ? 10 : delay) * 10;
bool havetrans=hold[1]&0x1;
trans_index = havetrans ? hold[4] : -1;
count=0;
state=SkipBlockSize;
}
break;
case SkipBlockSize:
expectcount=ch;
count=0;
if (expectcount) state=SkipBlock;
else state=Introducer;
break;
case SkipBlock:
count++;
if (count==expectcount) state=SkipBlockSize;
break;
case Done:
digress=true;
/* Netscape ignores the junk, so we do too.
length++; // Unget
state=Error; // More calls to this is an error
*/
break;
case Error:
return -1; // Called again after done.
}
}
