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Fix for issue #159.

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This commit is contained in:
ManoloFLTK
2020-11-19 15:59:33 +01:00
parent 3ec51f0b80
commit e52e057cdf
2 changed files with 307 additions and 298 deletions
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src/drivers/X11/Fl_X11_Screen_Driver.cxx
+9 -10
View File
@@ -839,12 +839,19 @@ Fl_RGB_Image *Fl_X11_Screen_Driver::read_win_rectangle(int X, int Y, int w, int
} }
} }
if (!image) return 0;
if (s != 1) { if (s != 1) {
w = ws; w = ws;
h = hs; h = hs;
} }
const int d = 3; // Depth of image
uchar *p = NULL;
// Allocate the image data array as needed...
p = new uchar[w * h * d];
// Initialize the default colors/alpha in the whole image...
memset(p, 0, w * h * d);
if (image) {
#ifdef DEBUG #ifdef DEBUG
printf("width = %d\n", image->width); printf("width = %d\n", image->width);
printf("height = %d\n", image->height); printf("height = %d\n", image->height);
@@ -864,14 +871,6 @@ Fl_RGB_Image *Fl_X11_Screen_Driver::read_win_rectangle(int X, int Y, int w, int
printf("map_entries = %d\n", fl_visual->visual->map_entries); printf("map_entries = %d\n", fl_visual->visual->map_entries);
#endif // DEBUG #endif // DEBUG
const int d = 3; // Depth of image
uchar *p = NULL;
// Allocate the image data array as needed...
p = new uchar[w * h * d];
// Initialize the default colors/alpha in the whole image...
memset(p, 0, w * h * d);
// Check that we have valid mask/shift values... // Check that we have valid mask/shift values...
if (!image->red_mask && image->bits_per_pixel > 12) { if (!image->red_mask && image->bits_per_pixel > 12) {
// Greater than 12 bits must be TrueColor... // Greater than 12 bits must be TrueColor...
@@ -1163,7 +1162,7 @@ Fl_RGB_Image *Fl_X11_Screen_Driver::read_win_rectangle(int X, int Y, int w, int
// Destroy the X image we've read and return the RGB(A) image... // Destroy the X image we've read and return the RGB(A) image...
XDestroyImage(image); XDestroyImage(image);
}
Fl_RGB_Image *rgb = new Fl_RGB_Image(p, w, h, d); Fl_RGB_Image *rgb = new Fl_RGB_Image(p, w, h, d);
rgb->alloc_array = 1; rgb->alloc_array = 1;
return rgb; return rgb;
src/drivers/Xlib/Fl_Xlib_Graphics_Driver_image.cxx
+10
View File
@@ -644,6 +644,16 @@ static void alpha_blend(Fl_RGB_Image *img, int X, int Y, int W, int H, int cx, i
if (cy < 0) { H += cy; Y -= cy; cy = 0; } if (cy < 0) { H += cy; Y -= cy; cy = 0; }
if (W + cx > img->data_w()) W = img->data_w() - cx; if (W + cx > img->data_w()) W = img->data_w() - cx;
if (H + cy > img->data_h()) H = img->data_h() - cy; if (H + cy > img->data_h()) H = img->data_h() - cy;
// don't attempt to read outside the window/offscreen buffer limits
Window root_return;
int x_return, y_return;
unsigned int winW, winH;
unsigned int border_width_return;
unsigned int depth_return;
XGetGeometry(fl_display, fl_window, &root_return, &x_return, &y_return, &winW,
&winH, &border_width_return, &depth_return);
if (X+W > winW) W = winW-X;
if (Y+H > winH) H = winH-Y;
if (W <= 0 || H <= 0) return; if (W <= 0 || H <= 0) return;
int ld = img->ld(); int ld = img->ld();
if (ld == 0) ld = img->data_w() * img->d(); if (ld == 0) ld = img->data_w() * img->d();