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fixed transparency

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2152 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Václav Slavík 1999-04-13 22:29:58 +00:00
parent 5c51506096
commit e207152c59
1 changed files with 43 additions and 56 deletions
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99
src/common/imaggif.cpp
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@ -33,9 +33,7 @@ FOLLOWING CODE IS BY G.R.G. :
*/
/************************************************************************
READGIF.H - Leer un archivo GIF de 8 bits
------------------------------------------------------------------------
Tratamiento Digital de la Imagen
READGIF.H - Reads a GIF file
------------------------------------------------------------------------
Guillermo Rodriguez Garcia
<guille@iies.es>
@ -43,6 +41,7 @@ FOLLOWING CODE IS BY G.R.G. :
Version: 2.1
*************************************************************************/
typedef struct
{
int w; /* width */
@ -53,10 +52,9 @@ typedef struct
} IMAGEN;
/************************************************************************
READGIF.C - Lee un archivo GIF de 256 colores
------------------------------------------------------------------------
Tratamiento Digital de la Imagen
READGIF.C - Reads a GIF file
------------------------------------------------------------------------
Guillermo Rodriguez Garcia
<guille@iies.es>
@ -88,30 +86,17 @@ class gifDecoder
wxInputStream *f; /* input file */
public:
gifDecoder(wxInputStream *s) {f = s;}
int getcode(int bits);
int dgif(IMAGEN *img, int interl, int bits);
int readgif(IMAGEN *img);
private:
unsigned char mygetc();
// This is NEEDED! GetC is char (signed) why we need unsigned value
// from here
public:
gifDecoder(wxInputStream *s) { f = s; }
int getcode(int bits);
int dgif(IMAGEN *img, int interl, int bits);
int readgif(IMAGEN *img);
};
unsigned char gifDecoder::mygetc()
{
unsigned char c;
f -> Read(&c, 1);
return c;
}
/* getcode:
* Reads the next code from the file, with size 'bits'
* v2.0 - changed to support 'bits' values < 8
*/
int gifDecoder::getcode(int bits)
{
@ -123,15 +108,15 @@ int gifDecoder::getcode(int bits)
mask = (1 << bits) - 1;
code = (lastbyte >> (8 - restbits)) & mask;
/* keep reading new bytes until needed */
/* keep reading new bytes while needed */
while (bits > restbits)
{
/* if no bytes left in this block, read the next block */
if (restbyte == 0)
restbyte = mygetc();
restbyte = (unsigned char)f->GetC();
/* read next byte and isolate the bits we need */
lastbyte = mygetc();
lastbyte = (unsigned char)f->GetC();
mask = (1 << (bits - restbits)) - 1;
code = code + ((lastbyte & mask) << restbits);
restbyte--;
@ -139,7 +124,7 @@ int gifDecoder::getcode(int bits)
/* adjust total number of bits extracted from the buffer */
restbits = restbits + 8;
}
/* find number of bits reamining for next code */
restbits = (restbits - bits);
@ -147,6 +132,7 @@ int gifDecoder::getcode(int bits)
}
/* dgif:
* GIF decoding function. The initial code size (aka root size)
* is 'bits'. Supports interlaced images (interl == 1).
@ -283,6 +269,8 @@ int gifDecoder::dgif(IMAGEN *img, int interl, int bits)
return 0;
}
/* readgif:
* Reads a GIF image from the file with filename 'nombre' in the
* IMAGEN structure pointed by 'img'. Can read GIFs with any bit
@ -298,8 +286,9 @@ int gifDecoder::readgif(IMAGEN *img)
unsigned char pal[768];
unsigned char buf[16];
/* read header and logical screen descriptor block (LSDB) */
f -> Read(buf, 13);
f->Read(buf, 13);
/* check GIF signature */
if (memcmp(buf, "GIF", 3) != 0) return E_FORMATO;
@ -308,35 +297,29 @@ int gifDecoder::readgif(IMAGEN *img)
if ((buf[10] & 0x80) == 0x80)
{
ncolors = 2 << (buf[10] & 0x07);
f -> Read(pal, 3 * ncolors);
f->Read(pal, 3 * ncolors);
}
/* assume no transparent color */
img->transparent = -1;
/* skip most extensions */
while (mygetc() == 0x21) /* separator */
while (((unsigned char)f->GetC()) == 0x21) /* separator */
{
wxLogDebug(_T("ugh"));
if (mygetc() == 0xF9) /* graphic control ext. */
if (((unsigned char)f->GetC()) == 0xF9) /* graphic control ext. */
{
wxLogDebug(_T("..."));
f->Read(buf, 6);
wxLogDebug(_T("buf[1] is %i (%i)"), buf[1], buf[1] & 0x01);
if (buf[1] & 0x01) {
wxLogDebug(_T("setting transparen %i"), buf[4]);
if (buf[1] & 0x01)
img->transparent = buf[4];
}
}
else
while ((i = mygetc()) != 0) /* byte count */
while ((i = (unsigned char)f->GetC()) != 0) /* byte count */
f->SeekI(i, wxFromCurrent);
}
/* read image descriptor block (IDB) */
f -> Read(buf, 9);
f->Read(buf, 9);
img->w = buf[4] + 256 * buf[5];
img->h = buf[6] + 256 * buf[7];
size = img->w * img->h;
interl = ((buf[8] & 0x40)? 1 : 0);
@ -345,11 +328,11 @@ int gifDecoder::readgif(IMAGEN *img)
if ((buf[8] & 0x80) == 0x80)
{
ncolors = 2 << (buf[8] & 0x07);
f -> Read(pal, 3 * ncolors);
f->Read(pal, 3 * ncolors);
}
/* get initial code size from first byte in raster data */
bits = mygetc();
bits = (unsigned char)f->GetC();
/* allocate memory for image and palette */
if ((img->p = (unsigned char*) malloc(size)) == NULL) return E_MEMORIA;
@ -357,7 +340,7 @@ int gifDecoder::readgif(IMAGEN *img)
/* shift palette to fit VGA 6-bit format */
for (i = 0; i < 768; i++)
(img->pal)[i] = (unsigned char)pal[i] /* >> 2 not needed under wxWin */;
(img->pal)[i] = (unsigned char)pal[i]; /* >> 2 not in wxWin */
/* decode GIF */
dgif(img, interl, bits);
@ -366,6 +349,8 @@ int gifDecoder::readgif(IMAGEN *img)
return E_OK;
}
/*
FOLLOWING CODE IS BY V.S. :
@ -389,8 +374,8 @@ bool wxGIFHandler::LoadFile( wxImage *image, wxInputStream& stream )
decod = new gifDecoder(&stream);
if (decod -> readgif(&igif) != E_OK) {
wxLogDebug(_T("Error reading GIF"));
if (decod->readgif(&igif) != E_OK) {
wxLogDebug("Error reading GIF");
delete decod;
return FALSE;
}
@ -402,24 +387,27 @@ bool wxGIFHandler::LoadFile( wxImage *image, wxInputStream& stream )
free(igif.p);
return FALSE;
}
image->SetMask(FALSE);
ptr = image->GetData();
src = igif.p;
pal = igif.pal;
if (igif.transparent != -1) {
for (i = 0; i < 256; i++)
if ((pal[3 * i + 0] == 255) && (pal[3 * i + 1] == 0) && (pal[3 * i + 2] == 255)) pal[3 * i + 2] = 254;
pal[3 * (igif.transparent) + 0] = 255,
pal[3 * (igif.transparent) + 1] = 0,
pal[3 * (igif.transparent) + 2] = 255;
image->SetMaskColour(255, 0, 255);
}
else image->SetMask(FALSE);
for (i = 0; i < igif.w * igif.h; i++, src++) {
*(ptr++) = pal[3 * (*src) + 0];
*(ptr++) = pal[3 * (*src) + 1];
*(ptr++) = pal[3 * (*src) + 2];
}
if (igif.transparent != -1) {
wxLogDebug(_T("oko"));
image->SetMaskColour(pal[3 * (igif.transparent) + 0], pal[3 * (igif.transparent) + 0], pal[3 * (igif.transparent) + 0]);
image->SetMask(TRUE);
}
wxLogDebug(_T("(unsigned int)%i"), (unsigned int)-1);
free(igif.pal);
free(igif.p);
return TRUE;
@ -427,7 +415,7 @@ bool wxGIFHandler::LoadFile( wxImage *image, wxInputStream& stream )
bool wxGIFHandler::SaveFile( wxImage *image, wxOutputStream& stream )
{
wxLogDebug(_T("wxGIFHandler is read-only!!"));
wxLogDebug("wxGIFHandler is read-only!!");
return FALSE;
}
@ -436,4 +424,3 @@ bool wxGIFHandler::SaveFile( wxImage *image, wxOutputStream& stream )