X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/4bb6408c2631988fab9925014c6619358bf867de..fd71308fc89eac2dd212b715eba68a993fa78f53:/src/motif/colour.cpp diff --git a/src/motif/colour.cpp b/src/motif/colour.cpp index a6b5b66879..a6a1287ff6 100644 --- a/src/motif/colour.cpp +++ b/src/motif/colour.cpp @@ -9,12 +9,20 @@ // Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// +//// TODO: make wxColour a ref-counted object, +//// so pixel values get shared. + #ifdef __GNUG__ #pragma implementation "colour.h" #endif #include "wx/gdicmn.h" #include "wx/colour.h" +#include "wx/app.h" + +#include + +#include "wx/motif/private.h" #if !USE_SHARED_LIBRARY IMPLEMENT_DYNAMIC_CLASS(wxColour, wxObject) @@ -26,9 +34,7 @@ wxColour::wxColour () { m_isInit = FALSE; m_red = m_blue = m_green = 0; -/* TODO - m_pixel = 0; -*/ + m_pixel = -1; } wxColour::wxColour (unsigned char r, unsigned char g, unsigned char b) @@ -37,9 +43,7 @@ wxColour::wxColour (unsigned char r, unsigned char g, unsigned char b) m_green = g; m_blue = b; m_isInit = TRUE; -/* TODO - m_pixel = PALETTERGB (m_red, m_green, m_blue); -*/ + m_pixel = -1; } wxColour::wxColour (const wxColour& col) @@ -48,9 +52,7 @@ wxColour::wxColour (const wxColour& col) m_green = col.m_green; m_blue = col.m_blue; m_isInit = col.m_isInit; -/* TODO m_pixel = col.m_pixel; -*/ } wxColour& wxColour::operator =(const wxColour& col) @@ -59,9 +61,7 @@ wxColour& wxColour::operator =(const wxColour& col) m_green = col.m_green; m_blue = col.m_blue; m_isInit = col.m_isInit; -/* TODO m_pixel = col.m_pixel; -*/ return *this; } @@ -73,6 +73,7 @@ wxColour::wxColour (const wxString& col) m_red = the_colour->Red (); m_green = the_colour->Green (); m_blue = the_colour->Blue (); + m_pixel = the_colour->m_pixel; m_isInit = TRUE; } else @@ -82,9 +83,6 @@ wxColour::wxColour (const wxString& col) m_blue = 0; m_isInit = FALSE; } -/* TODO - m_pixel = PALETTERGB (m_red, m_green, m_blue); -*/ } wxColour::~wxColour () @@ -99,6 +97,7 @@ wxColour& wxColour::operator = (const wxString& col) m_red = the_colour->Red (); m_green = the_colour->Green (); m_blue = the_colour->Blue (); + m_pixel = the_colour->m_pixel; m_isInit = TRUE; } else @@ -108,9 +107,7 @@ wxColour& wxColour::operator = (const wxString& col) m_blue = 0; m_isInit = FALSE; } -/* TODO - m_pixel = PALETTERGB (m_red, m_green, m_blue); -*/ + return (*this); } @@ -120,7 +117,116 @@ void wxColour::Set (unsigned char r, unsigned char g, unsigned char b) m_green = g; m_blue = b; m_isInit = TRUE; -/* TODO - m_pixel = PALETTERGB (m_red, m_green, m_blue); -*/ + m_pixel = -1; +} + +// Allocate a colour, or nearest colour, using the given display. +// If realloc is TRUE, ignore the existing pixel, otherwise just return +// the existing one. +// Returns the old or allocated pixel. + +// TODO: can this handle mono displays? If not, we should have an extra +// flag to specify whether this should be black or white by default. + +int wxColour::AllocColour(WXDisplay* display, bool realloc) +{ + if ((m_pixel != -1) && !realloc) + return m_pixel; + + XColor color; + color.red = (unsigned short) Red (); + color.red |= color.red << 8; + color.green = (unsigned short) Green (); + color.green |= color.green << 8; + color.blue = (unsigned short) Blue (); + color.blue |= color.blue << 8; + + color.flags = DoRed | DoGreen | DoBlue; + + WXColormap cmap = wxTheApp->GetMainColormap(display); + + if (!XAllocColor ((Display*) display, (Colormap) cmap, &color)) + { + m_pixel = wxGetBestMatchingPixel((Display*) display, &color,(Colormap) cmap); + return m_pixel; + } + else + { + m_pixel = (int) color.pixel; + return m_pixel; + } +} + +/*------------------------------------------- +Markus Emmenegger +Find the pixel value with an assigned color closest to the desired color +Used if color cell allocation fails +As the returned pixel value may be in use by another application, +the color might change anytime. +But in many cases, that is still better than always using black. +-- +Chris Breeze +Improvements: +1) More efficient calculation of RGB distance of colour cell from + the desired colour. There is no need to take the sqrt of 'dist', and + since we are only interested in the top 8-bits of R, G and B we + can perform integer arithmetic. +2) Attempt to allocate a read-only colour when a close match is found. + A read-only colour will not change. +3) Fall back to the closest match if no read-only colours are available. + +Possible further improvements: +1) Scan the lookup table and sort the colour cells in order of +increasing + distance from the desired colour. Then attempt to allocate a +read-only + colour starting from the nearest match. +2) Linear RGB distance is not a particularly good method of colour +matching + (though it is quick). Converting the colour to HLS and then comparing + may give better matching. +-------------------------------------------*/ + +int wxGetBestMatchingPixel(Display *display, XColor *desiredColor, Colormap cmap) +{ + if (cmap == (Colormap) NULL) + cmap = (Colormap) wxTheApp->GetMainColormap(display); + + int numPixVals = XDisplayCells(display, DefaultScreen (display)); + int mindist = 256 * 256 * 3; + int bestpixel = (int) BlackPixel (display, DefaultScreen (display)); + int red = desiredColor->red >> 8; + int green = desiredColor->green >> 8; + int blue = desiredColor->blue >> 8; + const int threshold = 2 * 2 * 3; // allow an error of up to 2 in R,G & B + + for (int pixelcount = 0; pixelcount < numPixVals; pixelcount++) + { + XColor matching_color; + matching_color.pixel = pixelcount; + XQueryColor(display,cmap,&matching_color); + + int delta_red = red - (matching_color.red >> 8); + int delta_green = green - (matching_color.green >> 8); + int delta_blue = blue - (matching_color.blue >> 8); + + int dist = delta_red * delta_red + + delta_green * delta_green + + delta_blue * delta_blue; + + if (dist <= threshold) + { + // try to allocate a read-only colour... + if (XAllocColor (display, cmap, &matching_color)) + { + return matching_color.pixel; + } + } + if (dist < mindist) + { + bestpixel = pixelcount; + mindist = dist; + } + } + return bestpixel; }