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Slightly simpler implementation of Fl_Cocoa_Gl_Window_Driver::alpha_mask_for_string().

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git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@13031 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Manolo Gouy
2018-08-28 12:12:20 +00:00
parent 8df4a051ef
commit 9289a63af2
1 changed files with 10 additions and 21 deletions
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src/gl_draw.cxx
+10 -21
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@@ -750,43 +750,32 @@ int Fl_WinAPI_Gl_Window_Driver::overlay_color(Fl_Color i) {
#if defined(FL_CFG_GFX_QUARTZ)
# include "drivers/Quartz/Fl_Font.H"
# if !defined(kCGBitmapByteOrder32Host) // doc says available 10.4 but some 10.4 don't have it
# define kCGBitmapByteOrder32Host 0
# endif // !defined(kCGBitmapByteOrder32Host)
#include <FL/platform.H>
#include <FL/Fl_Image_Surface.H>
/* Some old Apple hardware doesn't implement the GL_EXT_texture_rectangle extension.
For it, draw_string_legacy_glut() is used to draw text.
*/
For it, draw_string_legacy_glut() is used to draw text. */
char *Fl_Cocoa_Gl_Window_Driver::alpha_mask_for_string(const char *str, int n, int w, int h)
{
// write str to a bitmap just big enough
CGColorSpaceRef lut = CGColorSpaceCreateDeviceRGB();
void *base = NULL;
if (fl_mac_os_version < 100600) base = calloc(4*w, h);
void* save_gc = fl_graphics_driver->gc();
CGContextRef gc = CGBitmapContextCreate(base, w, h, 8, w*4, lut,
(CGBitmapInfo)(kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
CGColorSpaceRelease(lut);
fl_graphics_driver->gc(gc);
Fl_Image_Surface *surf = new Fl_Image_Surface(w, h);
Fl_Surface_Device::push_current(surf);
fl_color(FL_WHITE);
CGContextScaleCTM(gc, gl_scale, -gl_scale);
CGContextTranslateCTM(gc, 0, -fl_descent());
CGContextScaleCTM(surf->offscreen(), gl_scale, gl_scale);
CGContextTranslateCTM(surf->offscreen(), 0, fl_height() - fl_descent());
fl_draw(str, n, 0, 0);
// get the alpha channel only of the bitmap
char *txt_buf = new char[w*h], *r = txt_buf, *q;
q = (char*)CGBitmapContextGetData(gc);
q = (char*)CGBitmapContextGetData(surf->offscreen());
for (int i = 0; i < h; i++) {
for (int j = 0; j < w; j++) {
*r++ = *(q+3);
q += 4;
}
}
CGContextRelease(gc);
fl_graphics_driver->gc(save_gc);
if (base) free(base);
Fl_Surface_Device::pop_current();
delete surf;
return txt_buf;
}