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better conversion of logo width/height to gl values

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Map the naive value back to an integer using the same algorithm as for
the scissor test and adjust the value if they dont match
This commit is contained in:
Kovid Goyal 2021-12-05 13:18:16 +05:30
parent 73386bd67f
commit 525a32be51
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GPG Key ID: 06BC317B515ACE7C
1 changed files with 12 additions and 2 deletions
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14
kitty/shaders.c
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@ -588,12 +588,22 @@ render_window_title(OSWindow *os_window, Screen *screen UNUSED, GLfloat xstart,
return 2.f * (GLfloat)bar_height / (GLfloat)os_window->viewport_height;
}
static GLfloat
gl_size(const unsigned int sz, const unsigned int viewport_size) {
// convert sz to OpenGL co-oridinate system. Checks that mapping back via roundf()
// yields the same value.
const GLfloat px = 2.f / viewport_size;
GLfloat ans = px * sz;
const unsigned int mapped_val = (unsigned int)roundf((ans * viewport_size) / 2.f);
return ans + px * (sz - mapped_val);
}
static void
draw_window_logo(ssize_t vao_idx, OSWindow *os_window, const WindowLogoRenderData *wl, const CellRenderData *crd) {
if (os_window->live_resize.in_progress) return;
BLEND_PREMULT;
GLfloat logo_width_gl = 2.f * ((float)wl->instance->width) / os_window->viewport_width;
GLfloat logo_height_gl = 2.f * ((float)wl->instance->height) / os_window->viewport_height;
GLfloat logo_width_gl = gl_size(wl->instance->width, os_window->viewport_width);
GLfloat logo_height_gl = gl_size(wl->instance->height, os_window->viewport_height);
GLfloat logo_left_gl = crd->gl.xstart + crd->gl.width * wl->position.canvas_x - logo_width_gl * wl->position.image_x;
GLfloat logo_top_gl = crd->gl.ystart - crd->gl.height * wl->position.canvas_y + logo_height_gl * wl->position.image_y;
static ImageRenderData ird = {.group_count=1};