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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2100 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Václav Slavík 1999-04-12 13:44:52 +00:00
parent ca35e608cd
commit 99cc0158e2
1 changed files with 42 additions and 9 deletions
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51
src/common/imaggif.cpp
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@ -40,13 +40,14 @@ FOLLOWING CODE IS BY G.R.G. :
Guillermo Rodriguez Garcia
<guille@iies.es>
Version: 2.0
Version: 2.1
*************************************************************************/
typedef struct
{
int w; /* width */
int h; /* height */
int transparent; /* transparent color (-1 = none) */
unsigned char *p; /* bitmap */
unsigned char *pal; /* palette */
} IMAGEN;
@ -60,7 +61,7 @@ typedef struct
Guillermo Rodriguez Garcia
<guille@iies.es>
Version: 2.0
Version: 2.1
*************************************************************************/
@ -94,12 +95,19 @@ class gifDecoder
int readgif(IMAGEN *img);
private:
int mygetc() {return (unsigned char)f -> GetC();}
unsigned char mygetc();
// This is NEEDED! GetC is char (signed) why we need unsigned value
// from here
};
unsigned char gifDecoder::mygetc()
{
unsigned char c;
f -> Read(&c, 1);
return c;
}
/* getcode:
* Reads the next code from the file, with size 'bits'
@ -303,13 +311,26 @@ int gifDecoder::readgif(IMAGEN *img)
f -> Read(pal, 3 * ncolors);
}
/* skip extensions */
while (mygetc() == 0x21) /* separator */
{
mygetc(); /* function code */
/* assume no transparent color */
img->transparent = -1;
while ((i = mygetc()) != 0) /* byte count */
f -> SeekI(i, wxFromCurrent);
/* skip most extensions */
while (mygetc() == 0x21) /* separator */
{
wxLogDebug("ugh");
if (mygetc() == 0xF9) /* graphic control ext. */
{
wxLogDebug("...");
f->Read(buf, 6);
wxLogDebug("buf[1] is %i (%i)", buf[1], buf[1] & 0x01);
if (buf[1] & 0x01) {
wxLogDebug("setting transparen %i", buf[4]);
img->transparent = buf[4];
}
}
else
while ((i = mygetc()) != 0) /* byte count */
f->SeekI(i, wxFromCurrent);
}
/* read image descriptor block (IDB) */
@ -392,6 +413,13 @@ bool wxGIFHandler::LoadFile( wxImage *image, wxInputStream& stream )
*(ptr++) = pal[3 * (*src) + 2];
}
if (igif.transparent != -1) {
wxLogDebug("oko");
image->SetMaskColour(pal[3 * (igif.transparent) + 0], pal[3 * (igif.transparent) + 0], pal[3 * (igif.transparent) + 0]);
image->SetMask(TRUE);
}
wxLogDebug("(unsigned int)%i", (unsigned int)-1);
free(igif.pal);
free(igif.p);
return TRUE;
@ -404,3 +432,8 @@ bool wxGIFHandler::SaveFile( wxImage *image, wxOutputStream& stream )
}