+wxImage wxImage::GetSubImage( const wxRect &rect ) const
+{
+ wxImage image;
+
+ wxCHECK_MSG( Ok(), image, wxT("invalid image") );
+
+ wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) &&
+ (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
+ image, wxT("invalid subimage size") );
+
+ const int subwidth = rect.GetWidth();
+ const int subheight = rect.GetHeight();
+
+ image.Create( subwidth, subheight, false );
+
+ const unsigned char *src_data = GetData();
+ const unsigned char *src_alpha = M_IMGDATA->m_alpha;
+ unsigned char *subdata = image.GetData();
+ unsigned char *subalpha = NULL;
+
+ wxCHECK_MSG( subdata, image, wxT("unable to create image") );
+
+ if (src_alpha != NULL) {
+ image.SetAlpha();
+ subalpha = image.GetAlpha();
+ wxCHECK_MSG( subalpha, image, wxT("unable to create alpha channel"));
+ }
+
+ if (M_IMGDATA->m_hasMask)
+ image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
+
+ const int width = GetWidth();
+ const int pixsoff = rect.GetLeft() + width * rect.GetTop();
+
+ src_data += 3 * pixsoff;
+ src_alpha += pixsoff; // won't be used if was NULL, so this is ok
+
+ for (long j = 0; j < subheight; ++j)
+ {
+ memcpy( subdata, src_data, 3 * subwidth );
+ subdata += 3 * subwidth;
+ src_data += 3 * width;
+ if (subalpha != NULL) {
+ memcpy( subalpha, src_alpha, subwidth );
+ subalpha += subwidth;
+ src_alpha += width;
+ }
+ }
+
+ return image;
+}
+
+wxImage wxImage::Size( const wxSize& size, const wxPoint& pos,
+ int r_, int g_, int b_ ) const
+{
+ wxImage image;
+
+ wxCHECK_MSG( Ok(), image, wxT("invalid image") );
+ wxCHECK_MSG( (size.GetWidth() > 0) && (size.GetHeight() > 0), image, wxT("invalid size") );
+
+ int width = GetWidth(), height = GetHeight();
+ image.Create(size.GetWidth(), size.GetHeight(), false);
+
+ unsigned char r = (unsigned char)r_;
+ unsigned char g = (unsigned char)g_;
+ unsigned char b = (unsigned char)b_;
+ if ((r_ == -1) && (g_ == -1) && (b_ == -1))
+ {
+ GetOrFindMaskColour( &r, &g, &b );
+ image.SetMaskColour(r, g, b);
+ }
+
+ image.SetRGB(wxRect(), r, g, b);
+
+ wxRect subRect(pos.x, pos.y, width, height);
+ wxRect finalRect(0, 0, size.GetWidth(), size.GetHeight());
+ if (pos.x < 0)
+ finalRect.width -= pos.x;
+ if (pos.y < 0)
+ finalRect.height -= pos.y;
+
+ subRect.Intersect(finalRect);
+
+ if (!subRect.IsEmpty())
+ {
+ if ((subRect.GetWidth() == width) && (subRect.GetHeight() == height))
+ image.Paste(*this, pos.x, pos.y);
+ else
+ image.Paste(GetSubImage(subRect), pos.x, pos.y);
+ }
+
+ return image;
+}
+
+void wxImage::Paste( const wxImage &image, int x, int y )
+{
+ wxCHECK_RET( Ok(), wxT("invalid image") );
+ wxCHECK_RET( image.Ok(), wxT("invalid image") );
+
+ AllocExclusive();
+
+ int xx = 0;
+ int yy = 0;
+ int width = image.GetWidth();
+ int height = image.GetHeight();
+
+ if (x < 0)
+ {
+ xx = -x;
+ width += x;
+ }
+ if (y < 0)
+ {
+ yy = -y;
+ height += y;
+ }
+
+ if ((x+xx)+width > M_IMGDATA->m_width)
+ width = M_IMGDATA->m_width - (x+xx);
+ if ((y+yy)+height > M_IMGDATA->m_height)
+ height = M_IMGDATA->m_height - (y+yy);
+
+ if (width < 1) return;
+ if (height < 1) return;
+
+ if ((!HasMask() && !image.HasMask()) ||
+ (HasMask() && !image.HasMask()) ||
+ ((HasMask() && image.HasMask() &&
+ (GetMaskRed()==image.GetMaskRed()) &&
+ (GetMaskGreen()==image.GetMaskGreen()) &&
+ (GetMaskBlue()==image.GetMaskBlue()))))
+ {
+ width *= 3;
+ unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
+ int source_step = image.GetWidth()*3;
+
+ unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
+ int target_step = M_IMGDATA->m_width*3;
+ for (int j = 0; j < height; j++)
+ {
+ memcpy( target_data, source_data, width );
+ source_data += source_step;
+ target_data += target_step;
+ }
+ return;
+ }
+
+ if (!HasMask() && image.HasMask())
+ {
+ unsigned char r = image.GetMaskRed();
+ unsigned char g = image.GetMaskGreen();
+ unsigned char b = image.GetMaskBlue();
+
+ width *= 3;
+ unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
+ int source_step = image.GetWidth()*3;
+
+ unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
+ int target_step = M_IMGDATA->m_width*3;
+
+ for (int j = 0; j < height; j++)
+ {
+ for (int i = 0; i < width; i+=3)
+ {
+ if ((source_data[i] != r) ||
+ (source_data[i+1] != g) ||
+ (source_data[i+2] != b))
+ {
+ memcpy( target_data+i, source_data+i, 3 );
+ }
+ }
+ source_data += source_step;
+ target_data += target_step;
+ }
+ }
+}
+
+void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
+ unsigned char r2, unsigned char g2, unsigned char b2 )
+{
+ wxCHECK_RET( Ok(), wxT("invalid image") );
+
+ AllocExclusive();
+
+ unsigned char *data = GetData();
+
+ const int w = GetWidth();
+ const int h = GetHeight();
+
+ for (int j = 0; j < h; j++)
+ for (int i = 0; i < w; i++)
+ {
+ if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
+ {
+ data[0] = r2;
+ data[1] = g2;
+ data[2] = b2;
+ }
+ data += 3;
+ }
+}
+
+wxImage wxImage::ConvertToGreyscale( double lr, double lg, double lb ) const
+{
+ wxImage image;
+
+ wxCHECK_MSG( Ok(), image, wxT("invalid image") );
+
+ image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
+
+ unsigned char *dest = image.GetData();
+
+ wxCHECK_MSG( dest, image, wxT("unable to create image") );
+
+ unsigned char *src = M_IMGDATA->m_data;
+ bool hasMask = M_IMGDATA->m_hasMask;
+ unsigned char maskRed = M_IMGDATA->m_maskRed;
+ unsigned char maskGreen = M_IMGDATA->m_maskGreen;
+ unsigned char maskBlue = M_IMGDATA->m_maskBlue;
+
+ if ( hasMask )
+ image.SetMaskColour(maskRed, maskGreen, maskBlue);
+
+ const long size = M_IMGDATA->m_width * M_IMGDATA->m_height;
+ for ( long i = 0; i < size; i++, src += 3, dest += 3 )
+ {
+ // don't modify the mask
+ if ( hasMask && src[0] == maskRed && src[1] == maskGreen && src[2] == maskBlue )
+ {
+ memcpy(dest, src, 3);
+ }
+ else
+ {
+ // calculate the luma
+ double luma = (src[0] * lr + src[1] * lg + src[2] * lb) + 0.5;
+ dest[0] = dest[1] = dest[2] = wx_static_cast(unsigned char, luma);
+ }
+ }
+
+ // copy the alpha channel, if any
+ if (HasAlpha())
+ {
+ const size_t alphaSize = GetWidth() * GetHeight();
+ unsigned char *alpha = (unsigned char*)malloc(alphaSize);
+ memcpy(alpha, GetAlpha(), alphaSize);
+ image.InitAlpha();
+ image.SetAlpha(alpha);
+ }
+
+ return image;
+}
+
+wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
+{
+ wxImage image;
+
+ wxCHECK_MSG( Ok(), image, wxT("invalid image") );
+
+ image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
+
+ unsigned char *data = image.GetData();
+
+ wxCHECK_MSG( data, image, wxT("unable to create image") );
+
+ if (M_IMGDATA->m_hasMask)
+ {
+ if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
+ M_IMGDATA->m_maskBlue == b)
+ image.SetMaskColour( 255, 255, 255 );
+ else
+ image.SetMaskColour( 0, 0, 0 );
+ }
+
+ long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
+
+ unsigned char *srcd = M_IMGDATA->m_data;
+ unsigned char *tard = image.GetData();
+
+ for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
+ {
+ if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
+ tard[0] = tard[1] = tard[2] = 255;
+ else
+ tard[0] = tard[1] = tard[2] = 0;
+ }
+
+ return image;
+}
+
+int wxImage::GetWidth() const
+{
+ wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
+
+ return M_IMGDATA->m_width;
+}
+
+int wxImage::GetHeight() const
+{
+ wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
+
+ return M_IMGDATA->m_height;
+}
+
+long wxImage::XYToIndex(int x, int y) const
+{
+ if ( Ok() &&
+ x >= 0 && y >= 0 &&
+ x < M_IMGDATA->m_width && y < M_IMGDATA->m_height )
+ {
+ return y*M_IMGDATA->m_width + x;
+ }
+
+ return -1;
+}
+
+void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
+{
+ long pos = XYToIndex(x, y);
+ wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
+
+ AllocExclusive();
+
+ pos *= 3;
+
+ M_IMGDATA->m_data[ pos ] = r;
+ M_IMGDATA->m_data[ pos+1 ] = g;
+ M_IMGDATA->m_data[ pos+2 ] = b;
+}
+
+void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, unsigned char b )
+{
+ wxCHECK_RET( Ok(), wxT("invalid image") );
+
+ AllocExclusive();
+
+ wxRect rect(rect_);
+ wxRect imageRect(0, 0, GetWidth(), GetHeight());
+ if ( rect == wxRect() )
+ {
+ rect = imageRect;
+ }
+ else
+ {
+ wxCHECK_RET( imageRect.Contains(rect.GetTopLeft()) &&
+ imageRect.Contains(rect.GetBottomRight()),
+ wxT("invalid bounding rectangle") );
+ }
+
+ int x1 = rect.GetLeft(),
+ y1 = rect.GetTop(),
+ x2 = rect.GetRight() + 1,
+ y2 = rect.GetBottom() + 1;
+
+ unsigned char *data wxDUMMY_INITIALIZE(NULL);
+ int x, y, width = GetWidth();
+ for (y = y1; y < y2; y++)
+ {
+ data = M_IMGDATA->m_data + (y*width + x1)*3;
+ for (x = x1; x < x2; x++)
+ {
+ *data++ = r;
+ *data++ = g;
+ *data++ = b;
+ }
+ }
+}
+
+unsigned char wxImage::GetRed( int x, int y ) const
+{
+ long pos = XYToIndex(x, y);
+ wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
+
+ pos *= 3;
+
+ return M_IMGDATA->m_data[pos];
+}
+
+unsigned char wxImage::GetGreen( int x, int y ) const
+{
+ long pos = XYToIndex(x, y);
+ wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
+
+ pos *= 3;
+
+ return M_IMGDATA->m_data[pos+1];
+}
+
+unsigned char wxImage::GetBlue( int x, int y ) const
+{
+ long pos = XYToIndex(x, y);
+ wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
+
+ pos *= 3;
+
+ return M_IMGDATA->m_data[pos+2];
+}
+
+bool wxImage::IsOk() const
+{
+ // image of 0 width or height can't be considered ok - at least because it
+ // causes crashes in ConvertToBitmap() if we don't catch it in time
+ wxImageRefData *data = M_IMGDATA;
+ return data && data->m_ok && data->m_width && data->m_height;
+}
+
+unsigned char *wxImage::GetData() const
+{
+ wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
+
+ return M_IMGDATA->m_data;
+}
+
+void wxImage::SetData( unsigned char *data, bool static_data )
+{
+ wxCHECK_RET( Ok(), wxT("invalid image") );
+
+ wxImageRefData *newRefData = new wxImageRefData();
+
+ newRefData->m_width = M_IMGDATA->m_width;
+ newRefData->m_height = M_IMGDATA->m_height;
+ newRefData->m_data = data;
+ newRefData->m_ok = true;
+ newRefData->m_maskRed = M_IMGDATA->m_maskRed;
+ newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
+ newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
+ newRefData->m_hasMask = M_IMGDATA->m_hasMask;
+ newRefData->m_static = static_data;
+
+ UnRef();
+
+ m_refData = newRefData;
+}
+
+void wxImage::SetData( unsigned char *data, int new_width, int new_height, bool static_data )
+{
+ wxImageRefData *newRefData = new wxImageRefData();
+
+ if (m_refData)
+ {
+ newRefData->m_width = new_width;
+ newRefData->m_height = new_height;
+ newRefData->m_data = data;
+ newRefData->m_ok = true;
+ newRefData->m_maskRed = M_IMGDATA->m_maskRed;
+ newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
+ newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
+ newRefData->m_hasMask = M_IMGDATA->m_hasMask;
+ }
+ else
+ {
+ newRefData->m_width = new_width;
+ newRefData->m_height = new_height;
+ newRefData->m_data = data;
+ newRefData->m_ok = true;
+ }
+ newRefData->m_static = static_data;
+
+ UnRef();
+
+ m_refData = newRefData;
+}
+
+// ----------------------------------------------------------------------------
+// alpha channel support
+// ----------------------------------------------------------------------------
+
+void wxImage::SetAlpha(int x, int y, unsigned char alpha)
+{
+ wxCHECK_RET( HasAlpha(), wxT("no alpha channel") );
+
+ long pos = XYToIndex(x, y);
+ wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
+
+ AllocExclusive();
+
+ M_IMGDATA->m_alpha[pos] = alpha;
+}
+
+unsigned char wxImage::GetAlpha(int x, int y) const
+{
+ wxCHECK_MSG( HasAlpha(), 0, wxT("no alpha channel") );
+
+ long pos = XYToIndex(x, y);
+ wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
+
+ return M_IMGDATA->m_alpha[pos];
+}
+
+bool
+wxImage::ConvertColourToAlpha(unsigned char r, unsigned char g, unsigned char b)
+{
+ SetAlpha(NULL);
+
+ const int w = M_IMGDATA->m_width;
+ const int h = M_IMGDATA->m_height;
+
+ unsigned char *alpha = GetAlpha();
+ unsigned char *data = GetData();
+
+ for ( int y = 0; y < h; y++ )
+ {
+ for ( int x = 0; x < w; x++ )
+ {
+ *alpha++ = *data;
+ *data++ = r;
+ *data++ = g;
+ *data++ = b;
+ }
+ }
+
+ return true;
+}
+
+void wxImage::SetAlpha( unsigned char *alpha, bool static_data )
+{
+ wxCHECK_RET( Ok(), wxT("invalid image") );
+
+ AllocExclusive();
+
+ if ( !alpha )
+ {
+ alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
+ }
+
+ if( !M_IMGDATA->m_staticAlpha )
+ free(M_IMGDATA->m_alpha);
+
+ M_IMGDATA->m_alpha = alpha;
+ M_IMGDATA->m_staticAlpha = static_data;
+}
+
+unsigned char *wxImage::GetAlpha() const
+{
+ wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
+
+ return M_IMGDATA->m_alpha;
+}
+
+void wxImage::InitAlpha()
+{
+ wxCHECK_RET( !HasAlpha(), wxT("image already has an alpha channel") );
+
+ // initialize memory for alpha channel
+ SetAlpha();
+
+ unsigned char *alpha = M_IMGDATA->m_alpha;
+ const size_t lenAlpha = M_IMGDATA->m_width * M_IMGDATA->m_height;
+
+ if ( HasMask() )
+ {
+ // use the mask to initialize the alpha channel.
+ const unsigned char * const alphaEnd = alpha + lenAlpha;
+
+ const unsigned char mr = M_IMGDATA->m_maskRed;
+ const unsigned char mg = M_IMGDATA->m_maskGreen;
+ const unsigned char mb = M_IMGDATA->m_maskBlue;
+ for ( unsigned char *src = M_IMGDATA->m_data;
+ alpha < alphaEnd;
+ src += 3, alpha++ )
+ {
+ *alpha = (src[0] == mr && src[1] == mg && src[2] == mb)
+ ? wxIMAGE_ALPHA_TRANSPARENT
+ : wxIMAGE_ALPHA_OPAQUE;
+ }
+
+ M_IMGDATA->m_hasMask = false;
+ }
+ else // no mask
+ {
+ // make the image fully opaque
+ memset(alpha, wxIMAGE_ALPHA_OPAQUE, lenAlpha);
+ }
+}
+
+// ----------------------------------------------------------------------------
+// mask support
+// ----------------------------------------------------------------------------
+
+void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
+{
+ wxCHECK_RET( Ok(), wxT("invalid image") );
+
+ AllocExclusive();
+
+ M_IMGDATA->m_maskRed = r;
+ M_IMGDATA->m_maskGreen = g;
+ M_IMGDATA->m_maskBlue = b;
+ M_IMGDATA->m_hasMask = true;
+}
+
+bool wxImage::GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const
+{
+ wxCHECK_MSG( Ok(), false, wxT("invalid image") );
+
+ if (M_IMGDATA->m_hasMask)
+ {
+ if (r) *r = M_IMGDATA->m_maskRed;
+ if (g) *g = M_IMGDATA->m_maskGreen;
+ if (b) *b = M_IMGDATA->m_maskBlue;
+ return true;
+ }
+ else
+ {
+ FindFirstUnusedColour(r, g, b);
+ return false;
+ }
+}
+
+unsigned char wxImage::GetMaskRed() const
+{
+ wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
+
+ return M_IMGDATA->m_maskRed;
+}
+
+unsigned char wxImage::GetMaskGreen() const
+{
+ wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
+
+ return M_IMGDATA->m_maskGreen;
+}
+
+unsigned char wxImage::GetMaskBlue() const
+{
+ wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
+
+ return M_IMGDATA->m_maskBlue;
+}
+
+void wxImage::SetMask( bool mask )
+{
+ wxCHECK_RET( Ok(), wxT("invalid image") );
+
+ AllocExclusive();
+
+ M_IMGDATA->m_hasMask = mask;
+}
+
+bool wxImage::HasMask() const
+{
+ wxCHECK_MSG( Ok(), false, wxT("invalid image") );
+
+ return M_IMGDATA->m_hasMask;
+}
+
+bool wxImage::IsTransparent(int x, int y, unsigned char threshold) const
+{
+ long pos = XYToIndex(x, y);
+ wxCHECK_MSG( pos != -1, false, wxT("invalid image coordinates") );
+
+ // check mask
+ if ( M_IMGDATA->m_hasMask )
+ {
+ const unsigned char *p = M_IMGDATA->m_data + 3*pos;
+ if ( p[0] == M_IMGDATA->m_maskRed &&
+ p[1] == M_IMGDATA->m_maskGreen &&
+ p[2] == M_IMGDATA->m_maskBlue )
+ {
+ return true;
+ }
+ }
+
+ // then check alpha
+ if ( M_IMGDATA->m_alpha )
+ {
+ if ( M_IMGDATA->m_alpha[pos] < threshold )
+ {
+ // transparent enough
+ return true;
+ }
+ }
+
+ // not transparent
+ return false;
+}
+
+bool wxImage::SetMaskFromImage(const wxImage& mask,
+ unsigned char mr, unsigned char mg, unsigned char mb)
+{
+ // check that the images are the same size
+ if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
+ {
+ wxLogError( _("Image and mask have different sizes.") );
+ return false;
+ }
+
+ // find unused colour
+ unsigned char r,g,b ;
+ if (!FindFirstUnusedColour(&r, &g, &b))
+ {
+ wxLogError( _("No unused colour in image being masked.") );
+ return false ;
+ }
+
+ AllocExclusive();
+
+ unsigned char *imgdata = GetData();
+ unsigned char *maskdata = mask.GetData();
+
+ const int w = GetWidth();
+ const int h = GetHeight();
+
+ for (int j = 0; j < h; j++)
+ {
+ for (int i = 0; i < w; i++)
+ {
+ if ((maskdata[0] == mr) && (maskdata[1] == mg) && (maskdata[2] == mb))
+ {
+ imgdata[0] = r;
+ imgdata[1] = g;
+ imgdata[2] = b;
+ }
+ imgdata += 3;
+ maskdata += 3;
+ }
+ }
+
+ SetMaskColour(r, g, b);
+ SetMask(true);
+
+ return true;
+}
+
+bool wxImage::ConvertAlphaToMask(unsigned char threshold)
+{
+ if (!HasAlpha())
+ return true;
+
+ unsigned char mr, mg, mb;
+ if (!FindFirstUnusedColour(&mr, &mg, &mb))
+ {
+ wxLogError( _("No unused colour in image being masked.") );
+ return false;
+ }
+
+ AllocExclusive();
+
+ SetMask(true);
+ SetMaskColour(mr, mg, mb);
+
+ unsigned char *imgdata = GetData();
+ unsigned char *alphadata = GetAlpha();
+
+ int w = GetWidth();
+ int h = GetHeight();
+
+ for (int y = 0; y < h; y++)
+ {
+ for (int x = 0; x < w; x++, imgdata += 3, alphadata++)
+ {
+ if (*alphadata < threshold)
+ {
+ imgdata[0] = mr;
+ imgdata[1] = mg;
+ imgdata[2] = mb;
+ }
+ }
+ }
+
+ if( !M_IMGDATA->m_staticAlpha )
+ free(M_IMGDATA->m_alpha);
+
+ M_IMGDATA->m_alpha = NULL;
+ M_IMGDATA->m_staticAlpha = false;
+
+ return true;
+}
+
+// ----------------------------------------------------------------------------
+// Palette functions
+// ----------------------------------------------------------------------------
+
+#if wxUSE_PALETTE
+
+bool wxImage::HasPalette() const
+{
+ if (!Ok())
+ return false;
+
+ return M_IMGDATA->m_palette.Ok();
+}
+
+const wxPalette& wxImage::GetPalette() const
+{
+ wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
+
+ return M_IMGDATA->m_palette;
+}
+
+void wxImage::SetPalette(const wxPalette& palette)
+{
+ wxCHECK_RET( Ok(), wxT("invalid image") );
+
+ AllocExclusive();
+
+ M_IMGDATA->m_palette = palette;
+}
+
+#endif // wxUSE_PALETTE
+
+// ----------------------------------------------------------------------------
+// Option functions (arbitrary name/value mapping)
+// ----------------------------------------------------------------------------
+
+void wxImage::SetOption(const wxString& name, const wxString& value)
+{
+ wxCHECK_RET( Ok(), wxT("invalid image") );
+
+ AllocExclusive();
+
+ int idx = M_IMGDATA->m_optionNames.Index(name, false);
+ if (idx == wxNOT_FOUND)
+ {
+ M_IMGDATA->m_optionNames.Add(name);
+ M_IMGDATA->m_optionValues.Add(value);
+ }
+ else
+ {
+ M_IMGDATA->m_optionNames[idx] = name;
+ M_IMGDATA->m_optionValues[idx] = value;
+ }
+}
+
+void wxImage::SetOption(const wxString& name, int value)
+{
+ wxString valStr;
+ valStr.Printf(wxT("%d"), value);
+ SetOption(name, valStr);
+}
+
+wxString wxImage::GetOption(const wxString& name) const
+{
+ wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
+
+ int idx = M_IMGDATA->m_optionNames.Index(name, false);
+ if (idx == wxNOT_FOUND)
+ return wxEmptyString;
+ else
+ return M_IMGDATA->m_optionValues[idx];
+}
+
+int wxImage::GetOptionInt(const wxString& name) const
+{
+ return wxAtoi(GetOption(name));
+}
+
+bool wxImage::HasOption(const wxString& name) const
+{
+ wxCHECK_MSG( Ok(), false, wxT("invalid image") );
+
+ return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND);
+}
+
+// ----------------------------------------------------------------------------
+// image I/O
+// ----------------------------------------------------------------------------
+
+bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
+ long WXUNUSED_UNLESS_STREAMS(type),
+ int WXUNUSED_UNLESS_STREAMS(index) )
+{
+#if HAS_FILE_STREAMS
+ if (wxFileExists(filename))
+ {
+ wxImageFileInputStream stream(filename);
+ wxBufferedInputStream bstream( stream );
+ return LoadFile(bstream, type, index);
+ }
+ else
+ {
+ wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
+
+ return false;
+ }
+#else // !HAS_FILE_STREAMS
+ return false;
+#endif // HAS_FILE_STREAMS
+}
+
+bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
+ const wxString& WXUNUSED_UNLESS_STREAMS(mimetype),
+ int WXUNUSED_UNLESS_STREAMS(index) )
+{
+#if HAS_FILE_STREAMS
+ if (wxFileExists(filename))
+ {
+ wxImageFileInputStream stream(filename);
+ wxBufferedInputStream bstream( stream );
+ return LoadFile(bstream, mimetype, index);
+ }
+ else
+ {
+ wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
+
+ return false;
+ }
+#else // !HAS_FILE_STREAMS
+ return false;
+#endif // HAS_FILE_STREAMS
+}
+
+
+
+bool wxImage::SaveFile( const wxString& filename ) const
+{
+ wxString ext = filename.AfterLast('.').Lower();
+
+ wxImageHandler * pHandler = FindHandler(ext, -1);
+ if (pHandler)
+ {
+ SaveFile(filename, pHandler->GetType());
+ return true;
+ }
+
+ wxLogError(_("Can't save image to file '%s': unknown extension."), filename.c_str());
+
+ return false;
+}
+
+bool wxImage::SaveFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
+ int WXUNUSED_UNLESS_STREAMS(type) ) const
+{
+#if HAS_FILE_STREAMS
+ wxCHECK_MSG( Ok(), false, wxT("invalid image") );
+
+ ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
+
+ wxImageFileOutputStream stream(filename);
+
+ if ( stream.IsOk() )
+ {
+ wxBufferedOutputStream bstream( stream );
+ return SaveFile(bstream, type);
+ }
+#endif // HAS_FILE_STREAMS
+
+ return false;
+}
+
+bool wxImage::SaveFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
+ const wxString& WXUNUSED_UNLESS_STREAMS(mimetype) ) const
+{
+#if HAS_FILE_STREAMS
+ wxCHECK_MSG( Ok(), false, wxT("invalid image") );
+
+ ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
+
+ wxImageFileOutputStream stream(filename);
+
+ if ( stream.IsOk() )
+ {
+ wxBufferedOutputStream bstream( stream );
+ return SaveFile(bstream, mimetype);
+ }
+#endif // HAS_FILE_STREAMS
+
+ return false;
+}
+
+bool wxImage::CanRead( const wxString& WXUNUSED_UNLESS_STREAMS(name) )
+{
+#if HAS_FILE_STREAMS
+ wxImageFileInputStream stream(name);
+ return CanRead(stream);
+#else
+ return false;
+#endif
+}
+
+int wxImage::GetImageCount( const wxString& WXUNUSED_UNLESS_STREAMS(name),
+ long WXUNUSED_UNLESS_STREAMS(type) )
+{
+#if HAS_FILE_STREAMS
+ wxImageFileInputStream stream(name);
+ if (stream.Ok())
+ return GetImageCount(stream, type);
+#endif
+
+ return 0;
+}
+
+#if wxUSE_STREAMS
+
+bool wxImage::CanRead( wxInputStream &stream )
+{
+ const wxList& list = GetHandlers();
+
+ for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
+ {
+ wxImageHandler *handler=(wxImageHandler*)node->GetData();
+ if (handler->CanRead( stream ))
+ return true;
+ }
+
+ return false;
+}
+
+int wxImage::GetImageCount( wxInputStream &stream, long type )
+{
+ wxImageHandler *handler;
+
+ if ( type == wxBITMAP_TYPE_ANY )
+ {
+ wxList &list=GetHandlers();
+
+ for (wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext())
+ {
+ handler=(wxImageHandler*)node->GetData();
+ if ( handler->CanRead(stream) )
+ return handler->GetImageCount(stream);
+
+ }
+
+ wxLogWarning(_("No handler found for image type."));
+ return 0;
+ }
+
+ handler = FindHandler(type);
+
+ if ( !handler )
+ {
+ wxLogWarning(_("No image handler for type %ld defined."), type);
+ return false;
+ }
+
+ if ( handler->CanRead(stream) )
+ {
+ return handler->GetImageCount(stream);
+ }
+ else
+ {
+ wxLogError(_("Image file is not of type %ld."), type);
+ return 0;
+ }
+}
+
+bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
+{
+ UnRef();
+
+ m_refData = new wxImageRefData;
+
+ wxImageHandler *handler;
+
+ if ( type == wxBITMAP_TYPE_ANY )
+ {
+ wxList &list=GetHandlers();
+
+ for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
+ {
+ handler=(wxImageHandler*)node->GetData();
+ if ( handler->CanRead(stream) )
+ return handler->LoadFile(this, stream, true/*verbose*/, index);
+
+ }
+
+ wxLogWarning( _("No handler found for image type.") );
+ return false;
+ }
+
+ handler = FindHandler(type);
+
+ if (handler == 0)
+ {
+ wxLogWarning( _("No image handler for type %ld defined."), type );
+
+ return false;
+ }
+
+ if (stream.IsSeekable() && !handler->CanRead(stream))
+ {
+ wxLogError(_("Image file is not of type %ld."), type);
+ return false;
+ }
+ else
+ return handler->LoadFile(this, stream, true/*verbose*/, index);
+}
+
+bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
+{
+ UnRef();
+
+ m_refData = new wxImageRefData;
+
+ wxImageHandler *handler = FindHandlerMime(mimetype);
+
+ if (handler == 0)
+ {
+ wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
+
+ return false;
+ }
+
+ if (stream.IsSeekable() && !handler->CanRead(stream))
+ {
+ wxLogError(_("Image file is not of type %s."), mimetype);
+ return false;
+ }
+ else
+ return handler->LoadFile( this, stream, true/*verbose*/, index );
+}
+
+bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
+{
+ wxCHECK_MSG( Ok(), false, wxT("invalid image") );
+
+ wxImageHandler *handler = FindHandler(type);
+ if ( !handler )
+ {
+ wxLogWarning( _("No image handler for type %d defined."), type );
+
+ return false;
+ }
+
+ return handler->SaveFile( (wxImage*)this, stream );
+}
+
+bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
+{
+ wxCHECK_MSG( Ok(), false, wxT("invalid image") );
+
+ wxImageHandler *handler = FindHandlerMime(mimetype);
+ if ( !handler )
+ {
+ wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
+
+ return false;
+ }
+
+ return handler->SaveFile( (wxImage*)this, stream );
+}
+#endif // wxUSE_STREAMS
+
+// ----------------------------------------------------------------------------
+// image I/O handlers
+// ----------------------------------------------------------------------------
+
+void wxImage::AddHandler( wxImageHandler *handler )
+{
+ // Check for an existing handler of the type being added.
+ if (FindHandler( handler->GetType() ) == 0)
+ {
+ sm_handlers.Append( handler );
+ }
+ else
+ {
+ // This is not documented behaviour, merely the simplest 'fix'
+ // for preventing duplicate additions. If someone ever has
+ // a good reason to add and remove duplicate handlers (and they
+ // may) we should probably refcount the duplicates.
+ // also an issue in InsertHandler below.
+
+ wxLogDebug( _T("Adding duplicate image handler for '%s'"),
+ handler->GetName().c_str() );
+ delete handler;
+ }
+}
+
+void wxImage::InsertHandler( wxImageHandler *handler )
+{
+ // Check for an existing handler of the type being added.
+ if (FindHandler( handler->GetType() ) == 0)
+ {
+ sm_handlers.Insert( handler );
+ }
+ else
+ {
+ // see AddHandler for additional comments.
+ wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
+ handler->GetName().c_str() );
+ delete handler;
+ }
+}
+
+bool wxImage::RemoveHandler( const wxString& name )
+{
+ wxImageHandler *handler = FindHandler(name);
+ if (handler)
+ {
+ sm_handlers.DeleteObject(handler);
+ delete handler;
+ return true;
+ }
+ else
+ return false;
+}
+
+wxImageHandler *wxImage::FindHandler( const wxString& name )
+{
+ wxList::compatibility_iterator node = sm_handlers.GetFirst();
+ while (node)
+ {
+ wxImageHandler *handler = (wxImageHandler*)node->GetData();
+ if (handler->GetName().Cmp(name) == 0) return handler;
+
+ node = node->GetNext();
+ }
+ return NULL;
+}
+
+wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
+{
+ wxList::compatibility_iterator node = sm_handlers.GetFirst();
+ while (node)
+ {
+ wxImageHandler *handler = (wxImageHandler*)node->GetData();
+ if ( (handler->GetExtension().Cmp(extension) == 0) &&
+ (bitmapType == -1 || handler->GetType() == bitmapType) )
+ return handler;
+ node = node->GetNext();
+ }
+ return NULL;
+}
+
+wxImageHandler *wxImage::FindHandler( long bitmapType )
+{
+ wxList::compatibility_iterator node = sm_handlers.GetFirst();
+ while (node)
+ {
+ wxImageHandler *handler = (wxImageHandler *)node->GetData();
+ if (handler->GetType() == bitmapType) return handler;
+ node = node->GetNext();
+ }
+ return NULL;
+}
+
+wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
+{
+ wxList::compatibility_iterator node = sm_handlers.GetFirst();
+ while (node)
+ {
+ wxImageHandler *handler = (wxImageHandler *)node->GetData();
+ if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
+ node = node->GetNext();
+ }
+ return NULL;
+}
+
+void wxImage::InitStandardHandlers()
+{
+#if wxUSE_STREAMS
+ AddHandler(new wxBMPHandler);
+#endif // wxUSE_STREAMS
+}
+
+void wxImage::CleanUpHandlers()
+{
+ wxList::compatibility_iterator node = sm_handlers.GetFirst();
+ while (node)
+ {
+ wxImageHandler *handler = (wxImageHandler *)node->GetData();
+ wxList::compatibility_iterator next = node->GetNext();
+ delete handler;
+ node = next;
+ }
+
+ sm_handlers.Clear();
+}
+
+wxString wxImage::GetImageExtWildcard()
+{
+ wxString fmts;
+
+ wxList& Handlers = wxImage::GetHandlers();
+ wxList::compatibility_iterator Node = Handlers.GetFirst();
+ while ( Node )
+ {
+ wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
+ fmts += wxT("*.") + Handler->GetExtension();
+ Node = Node->GetNext();
+ if ( Node ) fmts += wxT(";");
+ }
+
+ return wxT("(") + fmts + wxT(")|") + fmts;
+}
+
+wxImage::HSVValue wxImage::RGBtoHSV(const RGBValue& rgb)
+{
+ const double red = rgb.red / 255.0,
+ green = rgb.green / 255.0,
+ blue = rgb.blue / 255.0;
+
+ // find the min and max intensity (and remember which one was it for the
+ // latter)
+ double minimumRGB = red;
+ if ( green < minimumRGB )
+ minimumRGB = green;
+ if ( blue < minimumRGB )
+ minimumRGB = blue;
+
+ enum { RED, GREEN, BLUE } chMax = RED;
+ double maximumRGB = red;
+ if ( green > maximumRGB )
+ {
+ chMax = GREEN;
+ maximumRGB = green;
+ }
+ if ( blue > maximumRGB )
+ {
+ chMax = BLUE;
+ maximumRGB = blue;
+ }
+
+ const double value = maximumRGB;
+
+ double hue = 0.0, saturation;
+ const double deltaRGB = maximumRGB - minimumRGB;
+ if ( wxIsNullDouble(deltaRGB) )
+ {
+ // Gray has no color
+ hue = 0.0;
+ saturation = 0.0;
+ }
+ else
+ {
+ switch ( chMax )
+ {
+ case RED:
+ hue = (green - blue) / deltaRGB;
+ break;
+
+ case GREEN:
+ hue = 2.0 + (blue - red) / deltaRGB;
+ break;
+
+ case BLUE:
+ hue = 4.0 + (red - green) / deltaRGB;
+ break;
+
+ default:
+ wxFAIL_MSG(wxT("hue not specified"));
+ break;
+ }
+
+ hue /= 6.0;
+
+ if ( hue < 0.0 )
+ hue += 1.0;
+
+ saturation = deltaRGB / maximumRGB;
+ }
+
+ return HSVValue(hue, saturation, value);
+}
+
+wxImage::RGBValue wxImage::HSVtoRGB(const HSVValue& hsv)
+{
+ double red, green, blue;
+
+ if ( wxIsNullDouble(hsv.saturation) )
+ {
+ // Grey
+ red = hsv.value;
+ green = hsv.value;
+ blue = hsv.value;
+ }
+ else // not grey
+ {
+ double hue = hsv.hue * 6.0; // sector 0 to 5
+ int i = (int)floor(hue);
+ double f = hue - i; // fractional part of h
+ double p = hsv.value * (1.0 - hsv.saturation);
+
+ switch (i)
+ {
+ case 0:
+ red = hsv.value;
+ green = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
+ blue = p;
+ break;
+
+ case 1:
+ red = hsv.value * (1.0 - hsv.saturation * f);
+ green = hsv.value;
+ blue = p;
+ break;
+
+ case 2:
+ red = p;
+ green = hsv.value;
+ blue = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
+ break;
+
+ case 3:
+ red = p;
+ green = hsv.value * (1.0 - hsv.saturation * f);
+ blue = hsv.value;
+ break;
+
+ case 4:
+ red = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
+ green = p;
+ blue = hsv.value;
+ break;
+
+ default: // case 5:
+ red = hsv.value;
+ green = p;
+ blue = hsv.value * (1.0 - hsv.saturation * f);
+ break;
+ }
+ }
+
+ return RGBValue((unsigned char)(red * 255.0),
+ (unsigned char)(green * 255.0),
+ (unsigned char)(blue * 255.0));
+}
+
+/*
+ * Rotates the hue of each pixel of the image. angle is a double in the range
+ * -1.0..1.0 where -1.0 is -360 degrees and 1.0 is 360 degrees
+ */
+void wxImage::RotateHue(double angle)
+{
+ AllocExclusive();
+
+ unsigned char *srcBytePtr;
+ unsigned char *dstBytePtr;
+ unsigned long count;
+ wxImage::HSVValue hsv;
+ wxImage::RGBValue rgb;
+
+ wxASSERT (angle >= -1.0 && angle <= 1.0);
+ count = M_IMGDATA->m_width * M_IMGDATA->m_height;
+ if ( count > 0 && !wxIsNullDouble(angle) )
+ {
+ srcBytePtr = M_IMGDATA->m_data;
+ dstBytePtr = srcBytePtr;
+ do
+ {
+ rgb.red = *srcBytePtr++;
+ rgb.green = *srcBytePtr++;
+ rgb.blue = *srcBytePtr++;
+ hsv = RGBtoHSV(rgb);
+
+ hsv.hue = hsv.hue + angle;
+ if (hsv.hue > 1.0)
+ hsv.hue = hsv.hue - 1.0;
+ else if (hsv.hue < 0.0)
+ hsv.hue = hsv.hue + 1.0;
+
+ rgb = HSVtoRGB(hsv);
+ *dstBytePtr++ = rgb.red;
+ *dstBytePtr++ = rgb.green;
+ *dstBytePtr++ = rgb.blue;
+ } while (--count != 0);
+ }
+}
+
+//-----------------------------------------------------------------------------
+// wxImageHandler
+//-----------------------------------------------------------------------------
+
+IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
+
+#if wxUSE_STREAMS
+bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
+{
+ return false;
+}
+
+bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
+{
+ return false;
+}
+
+int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
+{
+ return 1;
+}
+
+bool wxImageHandler::CanRead( const wxString& name )
+{
+ if (wxFileExists(name))
+ {
+ wxImageFileInputStream stream(name);
+ return CanRead(stream);
+ }
+
+ wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
+
+ return false;
+}
+
+bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
+{
+ wxFileOffset posOld = stream.TellI();
+ if ( posOld == wxInvalidOffset )
+ {
+ // can't test unseekable stream
+ return false;
+ }
+
+ bool ok = DoCanRead(stream);
+
+ // restore the old position to be able to test other formats and so on
+ if ( stream.SeekI(posOld) == wxInvalidOffset )
+ {
+ wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
+
+ // reading would fail anyhow as we're not at the right position
+ return false;
+ }
+
+ return ok;
+}
+
+#endif // wxUSE_STREAMS
+
+/* static */
+wxImageResolution
+wxImageHandler::GetResolutionFromOptions(const wxImage& image, int *x, int *y)
+{
+ wxCHECK_MSG( x && y, wxIMAGE_RESOLUTION_NONE, _T("NULL pointer") );
+
+ if ( image.HasOption(wxIMAGE_OPTION_RESOLUTIONX) &&
+ image.HasOption(wxIMAGE_OPTION_RESOLUTIONY) )
+ {
+ *x = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTIONX);
+ *y = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTIONY);
+ }
+ else if ( image.HasOption(wxIMAGE_OPTION_RESOLUTION) )
+ {
+ *x =
+ *y = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTION);
+ }
+ else // no resolution options specified
+ {
+ *x =
+ *y = 0;
+
+ return wxIMAGE_RESOLUTION_NONE;
+ }
+
+ // get the resolution unit too
+ int resUnit = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTIONUNIT);
+ if ( !resUnit )
+ {
+ // this is the default
+ resUnit = wxIMAGE_RESOLUTION_INCHES;
+ }
+
+ return (wxImageResolution)resUnit;
+}
+
+// ----------------------------------------------------------------------------
+// image histogram stuff
+// ----------------------------------------------------------------------------
+
+bool
+wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
+ unsigned char *g,
+ unsigned char *b,
+ unsigned char r2,
+ unsigned char b2,
+ unsigned char g2) const
+{
+ unsigned long key = MakeKey(r2, g2, b2);
+
+ while ( find(key) != end() )
+ {
+ // color already used
+ r2++;
+ if ( r2 >= 255 )
+ {
+ r2 = 0;
+ g2++;
+ if ( g2 >= 255 )
+ {
+ g2 = 0;
+ b2++;
+ if ( b2 >= 255 )
+ {
+ wxLogError(_("No unused colour in image.") );
+ return false;
+ }
+ }
+ }
+
+ key = MakeKey(r2, g2, b2);
+ }
+
+ if ( r )
+ *r = r2;
+ if ( g )
+ *g = g2;
+ if ( b )
+ *b = b2;
+
+ return true;
+}
+
+bool
+wxImage::FindFirstUnusedColour(unsigned char *r,
+ unsigned char *g,
+ unsigned char *b,
+ unsigned char r2,
+ unsigned char b2,
+ unsigned char g2) const
+{
+ wxImageHistogram histogram;
+
+ ComputeHistogram(histogram);
+
+ return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
+}
+
+
+
+// GRG, Dic/99
+// Counts and returns the number of different colours. Optionally stops
+// when it exceeds 'stopafter' different colours. This is useful, for
+// example, to see if the image can be saved as 8-bit (256 colour or
+// less, in this case it would be invoked as CountColours(256)). Default
+// value for stopafter is -1 (don't care).
+//
+unsigned long wxImage::CountColours( unsigned long stopafter ) const
+{
+ wxHashTable h;
+ wxObject dummy;
+ unsigned char r, g, b;
+ unsigned char *p;
+ unsigned long size, nentries, key;
+
+ p = GetData();
+ size = GetWidth() * GetHeight();
+ nentries = 0;
+
+ for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
+ {
+ r = *(p++);
+ g = *(p++);
+ b = *(p++);
+ key = wxImageHistogram::MakeKey(r, g, b);
+
+ if (h.Get(key) == NULL)
+ {
+ h.Put(key, &dummy);
+ nentries++;
+ }
+ }
+
+ return nentries;
+}
+
+
+unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
+{
+ unsigned char *p = GetData();
+ unsigned long nentries = 0;
+
+ h.clear();
+
+ const unsigned long size = GetWidth() * GetHeight();
+
+ unsigned char r, g, b;
+ for ( unsigned long n = 0; n < size; n++ )
+ {
+ r = *p++;
+ g = *p++;
+ b = *p++;
+
+ wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
+
+ if ( entry.value++ == 0 )
+ entry.index = nentries++;
+ }
+
+ return nentries;
+}
+
+/*
+ * Rotation code by Carlos Moreno
+ */
+
+static const double wxROTATE_EPSILON = 1e-10;
+
+// Auxiliary function to rotate a point (x,y) with respect to point p0
+// make it inline and use a straight return to facilitate optimization
+// also, the function receives the sine and cosine of the angle to avoid
+// repeating the time-consuming calls to these functions -- sin/cos can
+// be computed and stored in the calling function.
+
+static inline wxRealPoint
+wxRotatePoint(const wxRealPoint& p, double cos_angle, double sin_angle,
+ const wxRealPoint& p0)
+{
+ return wxRealPoint(p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
+ p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
+}
+
+static inline wxRealPoint
+wxRotatePoint(double x, double y, double cos_angle, double sin_angle,
+ const wxRealPoint & p0)
+{
+ return wxRotatePoint (wxRealPoint(x,y), cos_angle, sin_angle, p0);
+}
+
+wxImage wxImage::Rotate(double angle,
+ const wxPoint& centre_of_rotation,
+ bool interpolating,
+ wxPoint *offset_after_rotation) const
+{
+ // screen coordinates are a mirror image of "real" coordinates
+ angle = -angle;
+
+ const bool has_alpha = HasAlpha();
+
+ const int w = GetWidth();
+ const int h = GetHeight();
+
+ int i;
+
+ // Create pointer-based array to accelerate access to wxImage's data
+ unsigned char ** data = new unsigned char * [h];
+ data[0] = GetData();
+ for (i = 1; i < h; i++)
+ data[i] = data[i - 1] + (3 * w);
+
+ // Same for alpha channel
+ unsigned char ** alpha = NULL;
+ if (has_alpha)
+ {
+ alpha = new unsigned char * [h];
+ alpha[0] = GetAlpha();
+ for (i = 1; i < h; i++)
+ alpha[i] = alpha[i - 1] + w;
+ }
+
+ // precompute coefficients for rotation formula
+ const double cos_angle = cos(angle);
+ const double sin_angle = sin(angle);
+
+ // Create new Image to store the result
+ // First, find rectangle that covers the rotated image; to do that,
+ // rotate the four corners
+
+ const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
+
+ wxRealPoint p1 = wxRotatePoint (0, 0, cos_angle, sin_angle, p0);
+ wxRealPoint p2 = wxRotatePoint (0, h, cos_angle, sin_angle, p0);
+ wxRealPoint p3 = wxRotatePoint (w, 0, cos_angle, sin_angle, p0);
+ wxRealPoint p4 = wxRotatePoint (w, h, cos_angle, sin_angle, p0);
+
+ int x1a = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
+ int y1a = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
+ int x2a = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
+ int y2a = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
+
+ // Create rotated image
+ wxImage rotated (x2a - x1a + 1, y2a - y1a + 1, false);
+ // With alpha channel
+ if (has_alpha)
+ rotated.SetAlpha();
+
+ if (offset_after_rotation != NULL)
+ {
+ *offset_after_rotation = wxPoint (x1a, y1a);
+ }
+
+ // the rotated (destination) image is always accessed sequentially via this
+ // pointer, there is no need for pointer-based arrays here
+ unsigned char *dst = rotated.GetData();
+
+ unsigned char *alpha_dst = has_alpha ? rotated.GetAlpha() : NULL;
+
+ // if the original image has a mask, use its RGB values as the blank pixel,
+ // else, fall back to default (black).
+ unsigned char blank_r = 0;
+ unsigned char blank_g = 0;
+ unsigned char blank_b = 0;
+
+ if (HasMask())
+ {
+ blank_r = GetMaskRed();
+ blank_g = GetMaskGreen();
+ blank_b = GetMaskBlue();
+ rotated.SetMaskColour( blank_r, blank_g, blank_b );
+ }
+
+ // Now, for each point of the rotated image, find where it came from, by
+ // performing an inverse rotation (a rotation of -angle) and getting the
+ // pixel at those coordinates
+
+ const int rH = rotated.GetHeight();
+ const int rW = rotated.GetWidth();
+
+ // do the (interpolating) test outside of the loops, so that it is done
+ // only once, instead of repeating it for each pixel.
+ if (interpolating)
+ {
+ for (int y = 0; y < rH; y++)
+ {
+ for (int x = 0; x < rW; x++)
+ {
+ wxRealPoint src = wxRotatePoint (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
+
+ if (-0.25 < src.x && src.x < w - 0.75 &&
+ -0.25 < src.y && src.y < h - 0.75)
+ {
+ // interpolate using the 4 enclosing grid-points. Those
+ // points can be obtained using floor and ceiling of the
+ // exact coordinates of the point
+ int x1, y1, x2, y2;
+
+ if (0 < src.x && src.x < w - 1)
+ {
+ x1 = wxRound(floor(src.x));
+ x2 = wxRound(ceil(src.x));
+ }
+ else // else means that x is near one of the borders (0 or width-1)
+ {
+ x1 = x2 = wxRound (src.x);
+ }
+
+ if (0 < src.y && src.y < h - 1)
+ {
+ y1 = wxRound(floor(src.y));
+ y2 = wxRound(ceil(src.y));
+ }
+ else
+ {
+ y1 = y2 = wxRound (src.y);
+ }
+
+ // get four points and the distances (square of the distance,
+ // for efficiency reasons) for the interpolation formula
+
+ // GRG: Do not calculate the points until they are
+ // really needed -- this way we can calculate
+ // just one, instead of four, if d1, d2, d3
+ // or d4 are < wxROTATE_EPSILON
+
+ const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
+ const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
+ const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
+ const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
+
+ // Now interpolate as a weighted average of the four surrounding
+ // points, where the weights are the distances to each of those points
+
+ // If the point is exactly at one point of the grid of the source
+ // image, then don't interpolate -- just assign the pixel
+
+ // d1,d2,d3,d4 are positive -- no need for abs()
+ if (d1 < wxROTATE_EPSILON)
+ {
+ unsigned char *p = data[y1] + (3 * x1);
+ *(dst++) = *(p++);
+ *(dst++) = *(p++);
+ *(dst++) = *p;
+
+ if (has_alpha)
+ *(alpha_dst++) = *(alpha[y1] + x1);
+ }
+ else if (d2 < wxROTATE_EPSILON)
+ {
+ unsigned char *p = data[y1] + (3 * x2);
+ *(dst++) = *(p++);
+ *(dst++) = *(p++);
+ *(dst++) = *p;
+
+ if (has_alpha)
+ *(alpha_dst++) = *(alpha[y1] + x2);
+ }
+ else if (d3 < wxROTATE_EPSILON)
+ {
+ unsigned char *p = data[y2] + (3 * x2);
+ *(dst++) = *(p++);
+ *(dst++) = *(p++);
+ *(dst++) = *p;
+
+ if (has_alpha)
+ *(alpha_dst++) = *(alpha[y2] + x2);
+ }
+ else if (d4 < wxROTATE_EPSILON)
+ {
+ unsigned char *p = data[y2] + (3 * x1);
+ *(dst++) = *(p++);
+ *(dst++) = *(p++);
+ *(dst++) = *p;
+
+ if (has_alpha)
+ *(alpha_dst++) = *(alpha[y2] + x1);
+ }
+ else
+ {
+ // weights for the weighted average are proportional to the inverse of the distance
+ unsigned char *v1 = data[y1] + (3 * x1);
+ unsigned char *v2 = data[y1] + (3 * x2);
+ unsigned char *v3 = data[y2] + (3 * x2);
+ unsigned char *v4 = data[y2] + (3 * x1);
+
+ const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
+
+ // GRG: Unrolled.
+
+ *(dst++) = (unsigned char)
+ ( (w1 * *(v1++) + w2 * *(v2++) +
+ w3 * *(v3++) + w4 * *(v4++)) /
+ (w1 + w2 + w3 + w4) );
+ *(dst++) = (unsigned char)
+ ( (w1 * *(v1++) + w2 * *(v2++) +
+ w3 * *(v3++) + w4 * *(v4++)) /
+ (w1 + w2 + w3 + w4) );
+ *(dst++) = (unsigned char)
+ ( (w1 * *v1 + w2 * *v2 +
+ w3 * *v3 + w4 * *v4) /
+ (w1 + w2 + w3 + w4) );
+
+ if (has_alpha)
+ {
+ v1 = alpha[y1] + (x1);
+ v2 = alpha[y1] + (x2);
+ v3 = alpha[y2] + (x2);
+ v4 = alpha[y2] + (x1);
+
+ *(alpha_dst++) = (unsigned char)
+ ( (w1 * *v1 + w2 * *v2 +
+ w3 * *v3 + w4 * *v4) /
+ (w1 + w2 + w3 + w4) );
+ }
+ }
+ }
+ else
+ {
+ *(dst++) = blank_r;
+ *(dst++) = blank_g;
+ *(dst++) = blank_b;
+
+ if (has_alpha)
+ *(alpha_dst++) = 0;
+ }
+ }
+ }
+ }
+ else // not interpolating
+ {
+ for (int y = 0; y < rH; y++)
+ {
+ for (int x = 0; x < rW; x++)
+ {
+ wxRealPoint src = wxRotatePoint (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
+
+ const int xs = wxRound (src.x); // wxRound rounds to the
+ const int ys = wxRound (src.y); // closest integer
+
+ if (0 <= xs && xs < w && 0 <= ys && ys < h)
+ {
+ unsigned char *p = data[ys] + (3 * xs);
+ *(dst++) = *(p++);
+ *(dst++) = *(p++);
+ *(dst++) = *p;
+
+ if (has_alpha)
+ *(alpha_dst++) = *(alpha[ys] + (xs));
+ }
+ else
+ {
+ *(dst++) = blank_r;
+ *(dst++) = blank_g;
+ *(dst++) = blank_b;
+
+ if (has_alpha)
+ *(alpha_dst++) = 255;
+ }
+ }
+ }
+ }
+
+ delete [] data;
+ delete [] alpha;
+
+ return rotated;
+}
+
+
+
+
+
+// A module to allow wxImage initialization/cleanup
+// without calling these functions from app.cpp or from
+// the user's application.
+
+class wxImageModule: public wxModule
+{
+DECLARE_DYNAMIC_CLASS(wxImageModule)
+public:
+ wxImageModule() {}
+ bool OnInit() { wxImage::InitStandardHandlers(); return true; }
+ void OnExit() { wxImage::CleanUpHandlers(); }
+};
+
+IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
+
projects / wxWidgets.git / blobdiff