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more accurate mask creation for low color displays

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40595 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Paul Cornett
2006-08-13 05:12:18 +00:00
parent 005eba5abd
commit 13785a4b8f
1 changed files with 41 additions and 38 deletions
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79
src/gtk/bitmap.cpp
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@@ -86,78 +86,81 @@ bool wxMask::Create( const wxBitmap& bitmap,
m_bitmap = (GdkBitmap*) NULL;
}
wxImage image = bitmap.ConvertToImage();
if (!image.Ok()) return false;
m_bitmap = gdk_pixmap_new( wxGetRootWindow()->window, image.GetWidth(), image.GetHeight(), 1 );
const int w = bitmap.GetWidth();
const int h = bitmap.GetHeight();
m_bitmap = gdk_pixmap_new(wxGetRootWindow()->window, w, h, 1);
GdkGC *gc = gdk_gc_new( m_bitmap );
GdkColor color;
color.pixel = 1;
gdk_gc_set_foreground( gc, &color );
gdk_draw_rectangle( m_bitmap, gc, TRUE, 0, 0, image.GetWidth(), image.GetHeight() );
unsigned char *data = image.GetData();
int index = 0;
gdk_draw_rectangle(m_bitmap, gc, true, 0, 0, w, h);
unsigned char red = colour.Red();
unsigned char green = colour.Green();
unsigned char blue = colour.Blue();
GdkImage* image = NULL;
wxByte* data = NULL;
guint32 mask_pixel = 1;
int rowpadding = 0;
int data_inc = 0;
GdkVisual *visual = wxTheApp->GetGdkVisual();
int bpp = visual->depth;
if ((bpp == 16) && (visual->red_mask != 0xf800))
bpp = 15;
if (bpp == 15)
if (bitmap.HasPixbuf())
{
red = red & 0xf8;
green = green & 0xf8;
blue = blue & 0xf8;
GdkPixbuf* pixbuf = bitmap.GetPixbuf();
data = gdk_pixbuf_get_pixels(pixbuf);
data_inc = 3 + int(gdk_pixbuf_get_has_alpha(pixbuf) != 0);
rowpadding = gdk_pixbuf_get_rowstride(pixbuf) - data_inc * w;
}
else if (bpp == 16)
else
{
red = red & 0xf8;
green = green & 0xfc;
blue = blue & 0xf8;
}
else if (bpp == 12)
{
red = red & 0xf0;
green = green & 0xf0;
blue = blue & 0xf0;
image = gdk_drawable_get_image(bitmap.GetPixmap(), 0, 0, w, h);
GdkColormap* colormap = gdk_image_get_colormap(image);
if (colormap != NULL)
{
wxColor c(colour);
c.CalcPixel(colormap);
mask_pixel = c.GetPixel();
}
}
color.pixel = 0;
gdk_gc_set_foreground( gc, &color );
for (int j = 0; j < image.GetHeight(); j++)
for (int y = 0; y < h; y++)
{
int start_x = -1;
int i;
for (i = 0; i < image.GetWidth(); i++)
int x;
for (x = 0; x < w; x++)
{
if ((data[index] == red) &&
(data[index+1] == green) &&
(data[index+2] == blue))
bool isMask;
if (image != NULL)
isMask = gdk_image_get_pixel(image, x, y) == mask_pixel;
else
{
isMask = data[0] == red && data[1] == green && data[2] == blue;
data += data_inc;
}
if (isMask)
{
if (start_x == -1)
start_x = i;
start_x = x;
}
else
{
if (start_x != -1)
{
gdk_draw_line( m_bitmap, gc, start_x, j, i-1, j );
gdk_draw_line(m_bitmap, gc, start_x, y, x - 1, y);
start_x = -1;
}
}
index += 3;
}
if (start_x != -1)
gdk_draw_line( m_bitmap, gc, start_x, j, i, j );
gdk_draw_line(m_bitmap, gc, start_x, y, x, y);
data += rowpadding;
}
if (image != NULL)
g_object_unref(image);
g_object_unref (gc);
return true;