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Properly blank bar area

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Otherwise the rounded rect frame lets content from below the bar shine
through at the corners
This commit is contained in:
Kovid Goyal
2025-08-17 21:06:11 +05:30
parent ac66265b9d
commit 43d4e757aa
3 changed files with 18 additions and 0 deletions
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10
kitty/gl.c
View File

@@ -186,6 +186,16 @@ restore_viewport(void) {
glViewport(saved_viewport[0], saved_viewport[1], saved_viewport[2], saved_viewport[3]);
}
void
enable_scissor_using_top_left_origin(Viewport vp, unsigned full_framebuffer_height) {
glEnable(GL_SCISSOR_TEST);
GLsizei newy = full_framebuffer_height - (vp.top + vp.height);
glScissor(vp.left, newy, vp.width, vp.height);
}
void
disable_scissor(void) { glDisable(GL_SCISSOR_TEST); }
static float
linear_to_srgb(float c) { return (c <= 0.0031308f) ? 12.92f * c : 1.055f * powf(c, 1.0f / 2.4f) - 0.055f; }

2
kitty/gl.h
View File

@@ -67,3 +67,5 @@ void check_framebuffer_status_or_die(void);
void restore_viewport(void);
void bind_framebuffer_for_output(unsigned fbid);
void set_framebuffer_to_use_for_output(unsigned fbid);
void enable_scissor_using_top_left_origin(Viewport, unsigned);
void disable_scissor(void);

6
kitty/shaders.c
View File

@@ -803,11 +803,17 @@ render_a_bar(const UIRenderData *ui, WindowBarData *bar, PyObject *title, bool a
.height=bar_height + 2 * border_width, .left=ui->screen_left, .width=ui->screen_width, .top=ui->screen_top};
if (along_bottom) border_rect.top += ui->screen_height - border_rect.height;
const unsigned sh = ui->full_framebuffer_height;
// first blank the area to be drawn to background
enable_scissor_using_top_left_origin(border_rect, sh);
blank_canvas(1.f, bg);
disable_scissor();
// then draw the rendered text
save_viewport_using_top_left_origin(
border_rect.left + border_width, border_rect.top + border_width, bar_width, bar_height, sh);
draw_graphics(GRAPHICS_PROGRAM, &data, 0, 1, 1.f);
restore_viewport();
free_texture(&data.texture_id);
// finally draw border with transparent bg
draw_rounded_rect(ui->os_window, border_rect, sh, 1, ui->cell_width, fg, bg, 0.f);
return border_rect.height;
}