Adding wxBitmap::Rescale()
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@24113 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Robert Roebling
@@ -111,6 +111,9 @@ public:
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GdkPixmap *GetPixmap() const;
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GdkBitmap *GetBitmap() const;
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// Basically, this corresponds to Win32 StretchBlt()
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wxBitmap Rescale( int clipx, int clipy, int clipwidth, int clipheight, int width, int height );
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protected:
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bool CreateFromXpm(const char **bits);
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bool CreateFromImage(const wxImage& image, int depth);
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@@ -111,6 +111,9 @@ public:
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GdkPixmap *GetPixmap() const;
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GdkBitmap *GetBitmap() const;
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// Basically, this corresponds to Win32 StretchBlt()
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wxBitmap Rescale( int clipx, int clipy, int clipwidth, int clipheight, int width, int height );
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protected:
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bool CreateFromXpm(const char **bits);
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bool CreateFromImage(const wxImage& image, int depth);
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@@ -36,6 +36,12 @@
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#include <gdk/gdkrgb.h>
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#endif // GTK+ 2.0/1.2
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#include <math.h>
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//-----------------------------------------------------------------------------
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// 1-bit blitting implemented in dcclient.cpp
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//-----------------------------------------------------------------------------
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extern void gdk_wx_draw_bitmap (GdkDrawable *drawable,
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GdkGC *gc,
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GdkDrawable *src,
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@@ -976,6 +982,124 @@ wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect) const
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return ret;
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}
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wxBitmap wxBitmap::Rescale( int clipx, int clipy, int clipwidth, int clipheight, int newx, int newy )
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{
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wxCHECK_MSG( Ok(), wxNullBitmap, wxT("invalid bitmap") );
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if (newy==M_BMPDATA->m_width && newy==M_BMPDATA->m_height)
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return *this;
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GdkImage *img = (GdkImage*) NULL;
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if (GetPixmap())
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img = gdk_image_get( GetPixmap(), 0, 0, GetWidth(), GetHeight() );
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else if (GetBitmap())
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img = gdk_image_get( GetBitmap(), 0, 0, GetWidth(), GetHeight() );
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else
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wxFAIL_MSG( wxT("Ill-formed bitmap") );
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wxCHECK_MSG( img, wxNullBitmap, wxT("couldn't create image") );
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wxBitmap bmp;
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int bpp = -1;
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int width = wxMax(newx, 1);
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int height = wxMax(newy, 1);
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width = wxMin(width, clipwidth);
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height = wxMin(height, clipheight);
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GdkGC *gc = NULL;
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GdkPixmap *dstpix = NULL;
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if (GetPixmap())
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{
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GdkVisual *visual = gdk_window_get_visual( GetPixmap() );
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if (visual == NULL)
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visual = wxTheApp->GetGdkVisual();
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bpp = visual->depth;
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bmp = wxBitmap(width,height,bpp);
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dstpix = bmp.GetPixmap();
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gc = gdk_gc_new( dstpix );
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}
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char *dst = NULL;
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long dstbyteperline = 0;
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if (GetBitmap())
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{
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bpp = 1;
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dstbyteperline = width/8*M_BMPDATA->m_bpp;
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if (width*M_BMPDATA->m_bpp % 8 != 0)
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dstbyteperline++;
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dst = (char*) malloc(dstbyteperline*height);
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}
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// be careful to use the right scaling factor
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float scx = (float)M_BMPDATA->m_width/(float)newx;
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float scy = (float)M_BMPDATA->m_height/(float)newy;
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// prepare accel-tables
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int *tablex = (int *)calloc(width,sizeof(int));
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int *tabley = (int *)calloc(height,sizeof(int));
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// accel table filled with clipped values
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for (int x = 0; x < width; x++)
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tablex[x] = (int) floor(0.5 + scx * (x+clipx));
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for (int y = 0; y < height; y++)
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tabley[y] = (int) floor(0.5 + scy * (y+clipy));
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// Main rescaling routine starts here
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for(int h=0; h<height; h++)
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{
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char outbyte = 0;
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for (int w=0; w<width; w++)
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{
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guint32 pixval = gdk_image_get_pixel( img, tablex[w], tabley[h] );
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if (bpp==1)
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{
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if (!pixval)
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{
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char bit=1;
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char shift = bit << w % 8;
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outbyte |= shift;
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}
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if ((w+1)%8==0)
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{
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dst[h*dstbyteperline+w/8]=~outbyte;
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outbyte = 0;
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}
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}
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else
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{
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GdkColor col;
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col.pixel = pixval;
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gdk_gc_set_foreground( gc, &col );
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gdk_draw_point( dstpix, gc, w, h);
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}
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}
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// do not forget the last byte
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if (bpp == 1)
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dst[h*dstbyteperline+width/8] = ~outbyte;
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}
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free( tablex );
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free( tabley );
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gdk_image_destroy( img );
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if (gc) gdk_gc_unref( gc );
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if (bpp == 1)
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{
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bmp = wxBitmap( (const char *)dst, width, height, 1 );
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wxMask* bmask= new wxMask(bmp);
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bmp.SetMask(bmask);
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free(dst);
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}
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return bmp;
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}
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bool wxBitmap::SaveFile( const wxString &name, int type, wxPalette *WXUNUSED(palette) )
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{
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wxCHECK_MSG( Ok(), FALSE, wxT("invalid bitmap") );
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@@ -36,6 +36,12 @@
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#include <gdk/gdkrgb.h>
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#endif // GTK+ 2.0/1.2
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#include <math.h>
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//-----------------------------------------------------------------------------
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// 1-bit blitting implemented in dcclient.cpp
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//-----------------------------------------------------------------------------
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extern void gdk_wx_draw_bitmap (GdkDrawable *drawable,
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GdkGC *gc,
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GdkDrawable *src,
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@@ -976,6 +982,124 @@ wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect) const
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return ret;
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}
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wxBitmap wxBitmap::Rescale( int clipx, int clipy, int clipwidth, int clipheight, int newx, int newy )
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{
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wxCHECK_MSG( Ok(), wxNullBitmap, wxT("invalid bitmap") );
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if (newy==M_BMPDATA->m_width && newy==M_BMPDATA->m_height)
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return *this;
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GdkImage *img = (GdkImage*) NULL;
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if (GetPixmap())
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img = gdk_image_get( GetPixmap(), 0, 0, GetWidth(), GetHeight() );
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else if (GetBitmap())
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img = gdk_image_get( GetBitmap(), 0, 0, GetWidth(), GetHeight() );
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else
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wxFAIL_MSG( wxT("Ill-formed bitmap") );
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wxCHECK_MSG( img, wxNullBitmap, wxT("couldn't create image") );
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wxBitmap bmp;
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int bpp = -1;
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int width = wxMax(newx, 1);
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int height = wxMax(newy, 1);
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width = wxMin(width, clipwidth);
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height = wxMin(height, clipheight);
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GdkGC *gc = NULL;
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GdkPixmap *dstpix = NULL;
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if (GetPixmap())
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{
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GdkVisual *visual = gdk_window_get_visual( GetPixmap() );
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if (visual == NULL)
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visual = wxTheApp->GetGdkVisual();
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bpp = visual->depth;
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bmp = wxBitmap(width,height,bpp);
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dstpix = bmp.GetPixmap();
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gc = gdk_gc_new( dstpix );
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}
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char *dst = NULL;
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long dstbyteperline = 0;
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if (GetBitmap())
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{
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bpp = 1;
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dstbyteperline = width/8*M_BMPDATA->m_bpp;
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if (width*M_BMPDATA->m_bpp % 8 != 0)
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dstbyteperline++;
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dst = (char*) malloc(dstbyteperline*height);
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}
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// be careful to use the right scaling factor
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float scx = (float)M_BMPDATA->m_width/(float)newx;
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float scy = (float)M_BMPDATA->m_height/(float)newy;
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// prepare accel-tables
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int *tablex = (int *)calloc(width,sizeof(int));
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int *tabley = (int *)calloc(height,sizeof(int));
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// accel table filled with clipped values
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for (int x = 0; x < width; x++)
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tablex[x] = (int) floor(0.5 + scx * (x+clipx));
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for (int y = 0; y < height; y++)
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tabley[y] = (int) floor(0.5 + scy * (y+clipy));
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// Main rescaling routine starts here
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for(int h=0; h<height; h++)
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{
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char outbyte = 0;
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for (int w=0; w<width; w++)
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{
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guint32 pixval = gdk_image_get_pixel( img, tablex[w], tabley[h] );
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if (bpp==1)
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{
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if (!pixval)
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{
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char bit=1;
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char shift = bit << w % 8;
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outbyte |= shift;
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}
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if ((w+1)%8==0)
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{
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dst[h*dstbyteperline+w/8]=~outbyte;
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outbyte = 0;
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}
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}
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else
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{
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GdkColor col;
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col.pixel = pixval;
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gdk_gc_set_foreground( gc, &col );
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gdk_draw_point( dstpix, gc, w, h);
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}
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}
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// do not forget the last byte
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if (bpp == 1)
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dst[h*dstbyteperline+width/8] = ~outbyte;
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}
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free( tablex );
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free( tabley );
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gdk_image_destroy( img );
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if (gc) gdk_gc_unref( gc );
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if (bpp == 1)
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{
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bmp = wxBitmap( (const char *)dst, width, height, 1 );
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wxMask* bmask= new wxMask(bmp);
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bmp.SetMask(bmask);
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free(dst);
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}
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return bmp;
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}
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bool wxBitmap::SaveFile( const wxString &name, int type, wxPalette *WXUNUSED(palette) )
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{
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wxCHECK_MSG( Ok(), FALSE, wxT("invalid bitmap") );
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