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Extract optimal window size detection 

Extract the computation to detect whether the current size of the window
is already optimal.

This will allow to reuse it for rendering.
This commit is contained in:
Romain Vimont 2020-04-25 00:19:44 +02:00
parent ec047b501e
commit d860ad48e6
1 changed files with 25 additions and 19 deletions
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44
app/src/screen.c
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@ -68,6 +68,16 @@ get_preferred_display_bounds(struct size *bounds) {
return true;
}
static bool
is_optimal_size(struct size current_size, struct size content_size) {
// The size is optimal if we can recompute one dimension of the current
// size from the other
return current_size.height == current_size.width * content_size.height
/ content_size.width
|| current_size.width == current_size.height * content_size.width
/ content_size.height;
}
// return the optimal size of the window, with the following constraints:
// - it attempts to keep at least one dimension of the current_size (i.e. it
// crops the black borders)
@ -80,40 +90,36 @@ get_optimal_size(struct size current_size, struct size content_size) {
return current_size;
}
struct size display_size;
// 32 bits because we need to multiply two 16 bits values
uint32_t w;
uint32_t h;
struct size window_size;
struct size display_size;
if (!get_preferred_display_bounds(&display_size)) {
// could not get display bounds, do not constraint the size
w = current_size.width;
h = current_size.height;
window_size.width = current_size.width;
window_size.height = current_size.height;
} else {
w = MIN(current_size.width, display_size.width);
h = MIN(current_size.height, display_size.height);
window_size.width = MIN(current_size.width, display_size.width);
window_size.height = MIN(current_size.height, display_size.height);
}
if (h == w * content_size.height / content_size.width
|| w == h * content_size.width / content_size.height) {
// The size is already optimal, if we ignore rounding errors due to
// integer window dimensions
return (struct size) {w, h};
if (is_optimal_size(window_size, content_size)) {
return window_size;
}
bool keep_width = content_size.width * h > content_size.height * w;
bool keep_width = content_size.width * window_size.height
> content_size.height * window_size.width;
if (keep_width) {
// remove black borders on top and bottom
h = content_size.height * w / content_size.width;
window_size.height = content_size.height * window_size.width
/ content_size.width;
} else {
// remove black borders on left and right (or none at all if it already
// fits)
w = content_size.width * h / content_size.height;
window_size.width = content_size.width * window_size.height
/ content_size.height;
}
// w and h must fit into 16 bits
assert(w < 0x10000 && h < 0x10000);
return (struct size) {w, h};
return window_size;
}
// same as get_optimal_size(), but read the current size from the window