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Fl_Pixmap: improved algorithm for WIN32 printing

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git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@7503 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Manolo Gouy
2010-04-14 20:12:06 +00:00
parent f4a08a3672
commit 79b2c201a0
2 changed files with 65 additions and 24 deletions
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src/Fl_Pixmap.cxx
+5 -22
View File
@@ -152,37 +152,20 @@ void Fl_Pixmap::generic_device_draw(int XP, int YP, int WP, int HP, int cx, int
if(hMod) fl_TransparentBlt = (fl_transp_func)GetProcAddress(hMod, "TransparentBlt");
}
if (hMod) {
# define UNLIKELY_RGB_COLOR 2,3,4 // a nearly black color unlikely to occur in pixmaps
# define WIN_COLOR RGB(2,3,4)
Fl_Offscreen tmp_id = fl_create_offscreen(w(), h());
fl_begin_offscreen(tmp_id);
uchar *bitmap = 0;
fl_mask_bitmap = &bitmap;
// draw pixmap to offscreen using the unlikely color for background
fl_draw_pixmap(data(), 0, 0, fl_rgb_color(UNLIKELY_RGB_COLOR) );
// draw pixmap to offscreen
fl_draw_pixmap(data(), 0, 0);
fl_end_offscreen();
HDC new_gc = CreateCompatibleDC(fl_gc);
int save = SaveDC(new_gc);
SelectObject(new_gc, (void*)tmp_id);
// print all of offscreen but its parts using unlikely color
fl_TransparentBlt(fl_gc, X, Y, W, H, new_gc, cx, cy, w(), h(), WIN_COLOR );
// print all of offscreen but its parts in background color
extern UINT win_pixmap_bg_color; // computed by fl_draw_pixmap()
fl_TransparentBlt(fl_gc, X, Y, W, H, new_gc, cx, cy, w(), h(), win_pixmap_bg_color );
RestoreDC(new_gc,save);
// This is an approximate algorithm that fails to print pixmap pixels that would use the unlikely color.
// It can be transformed into an exact algorithm by adding the following commented out statements
// that print pixmap one more time hiding another color (any color would fit)
/*
# define UNLIKELY_RGB_COLOR2 4,3,2
# define WIN_COLOR2 RGB(4,3,2)
{
fl_begin_offscreen(tmp_id);
fl_draw_pixmap(data(), 0, 0, fl_rgb_color(UNLIKELY_RGB_COLOR2) );
fl_end_offscreen();
}
save = SaveDC(new_gc);
SelectObject(new_gc, (void*)tmp_id);
fl_TransparentBlt(fl_gc, X, Y, W, H, new_gc, cx, cy, w(), h(), WIN_COLOR2 );
RestoreDC(new_gc,save);
*/
DeleteDC(new_gc);
fl_delete_offscreen(tmp_id);
}
src/fl_draw_pixmap.cxx
+60 -2
View File
@@ -179,6 +179,40 @@ int fl_draw_pixmap(/*const*/ char* const* data, int x,int y,Fl_Color bg) {
return fl_draw_pixmap((const char*const*)data,x,y,bg);
}
#ifdef WIN32
// to compute an unused color to be used for the pixmap background
FL_EXPORT UINT win_pixmap_bg_color; // the RGB() of the pixmap background color
static int color_count; // # of non-transparent colors used in pixmap
static uchar *used_colors; // used_colors[3*i+j] j=0,1,2 are the RGB values of the ith used color
static void make_unused_color(uchar &r, uchar &g, uchar &b)
// makes an RGB triplet different from all the colors used in the pixmap
// and compute win_pixmap_bg_color from this triplet
{
int i;
r = 2; g = 3; b = 4;
while (1) {
for ( i = 0; i < color_count; i++) {
if(used_colors[3*i] == r && used_colors[3*i+1] == g && used_colors[3*i+2] == b) break;
}
if (i >= color_count) {
free(used_colors);
win_pixmap_bg_color = RGB(r, g, b);
return;
}
if (r < 255) r++;
else {
r = 0;
if (g < 255) g++;
else {
g = 0;
b++;
}
}
}
}
#endif
/**
Draw XPM image data, with the top-left corner at the given position.
\see fl_draw_pixmap(char* const* data, int x, int y, Fl_Color bg)
@@ -188,6 +222,11 @@ int fl_draw_pixmap(const char*const* cdata, int x, int y, Fl_Color bg) {
if (!fl_measure_pixmap(cdata, d.w, d.h)) return 0;
const uchar*const* data = (const uchar*const*)(cdata+1);
int transparent_index = -1;
uchar *transparent_c; // such that transparent_c[0,1,2] are the RGB of the transparent color
#ifdef WIN32
color_count = 0;
used_colors = (uchar *)malloc(abs(ncolors)*3*sizeof(uchar));
#endif
if (ncolors < 0) { // FLTK (non standard) compressed colormap
ncolors = -ncolors;
@@ -204,6 +243,7 @@ int fl_draw_pixmap(const char*const* cdata, int x, int y, Fl_Color bg) {
#endif
transparent_index = ' ';
Fl::get_color(bg, c[0], c[1], c[2]); c[3] = 0;
transparent_c = c;
p += 4;
ncolors--;
}
@@ -215,6 +255,12 @@ int fl_draw_pixmap(const char*const* cdata, int x, int y, Fl_Color bg) {
# if WORDS_BIGENDIAN
c += 4;
# endif
#endif
#ifdef WIN32
used_colors[3*color_count] = *p;
used_colors[3*color_count+1] = *(p+1);
used_colors[3*color_count+2] = *(p+2);
color_count++;
#endif
*c++ = *p++;
*c++ = *p++;
@@ -266,7 +312,16 @@ int fl_draw_pixmap(const char*const* cdata, int x, int y, Fl_Color bg) {
#ifdef __APPLE_QUARTZ__
c[3] = 255;
#endif
if (!fl_parse_color((const char*)p, c[0], c[1], c[2])) {
int parse = fl_parse_color((const char*)p, c[0], c[1], c[2]);
if (parse) {
#ifdef WIN32
used_colors[3*color_count] = c[0];
used_colors[3*color_count+1] = c[1];
used_colors[3*color_count+2] = c[2];
color_count++;
#endif
}
else {
// assume "None" or "#transparent" for any errors
// "bg" should be transparent...
Fl::get_color(bg, c[0], c[1], c[2]);
@@ -274,11 +329,14 @@ int fl_draw_pixmap(const char*const* cdata, int x, int y, Fl_Color bg) {
c[3] = 0;
#endif
transparent_index = ind;
transparent_c = c;
}
}
}
d.data = data;
#ifdef WIN32
make_unused_color(transparent_c[0], transparent_c[1], transparent_c[2]);
#endif
#ifndef __APPLE_QUARTZ__
// build the mask bitmap used by Fl_Pixmap: