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drm: set a device scale of 2 on HiDPI

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Using the same heuristics as gnome-settings-daemon (which ensures
that the bootsplash will be scaled if and only if the running system
is)

https://bugs.freedesktop.org/show_bug.cgi?id=84482
This commit is contained in:
Giovanni Campagna 2015-01-18 02:17:47 -08:00 • committed by Ray Strode
parent d70c1dc9ee
commit 78e8bbea18
1 changed files with 45 additions and 0 deletions
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45
src/plugins/renderers/drm/plugin.c
View file

@ -61,6 +61,12 @@
#define BYTES_PER_PIXEL (4)
/* The minimum resolution at which we turn on a device-scale of 2 */
#define HIDPI_LIMIT 192
#define HIDPI_MIN_HEIGHT 1200
/* From http://en.wikipedia.org/wiki/4K_resolution#Resolutions_of_common_formats */
#define SMALLEST_4K_WIDTH 3656
struct _ply_renderer_head
{
ply_renderer_backend_t *backend;
@ -391,6 +397,40 @@ ply_renderer_head_add_connector (ply_renderer_head_t *head,
return true;
}
static int get_device_scale (uint32_t width,
uint32_t height,
uint32_t width_mm,
uint32_t height_mm)
{
int device_scale;
double dpi_x, dpi_y;
device_scale = 1;
if (height < HIDPI_MIN_HEIGHT)
return 1;
/* Somebody encoded the aspect ratio (16/9 or 16/10)
* instead of the physical size */
if ((width_mm == 160 && height_mm == 90) ||
(width_mm == 160 && height_mm == 100) ||
(width_mm == 16 && height_mm == 9) ||
(width_mm == 16 && height_mm == 10))
return 1;
if (width_mm > 0 && height_mm > 0) {
dpi_x = (double)width / (width_mm / 25.4);
dpi_y = (double)height / (height_mm / 25.4);
/* We don't completely trust these values so both
must be high, and never pick higher ratio than
2 automatically */
if (dpi_x > HIDPI_LIMIT && dpi_y > HIDPI_LIMIT)
device_scale = 2;
}
return device_scale;
}
static ply_renderer_head_t *
ply_renderer_head_new (ply_renderer_backend_t *backend,
drmModeConnector *connector,
@ -425,6 +465,11 @@ ply_renderer_head_new (ply_renderer_backend_t *backend,
assert (ply_array_get_size (head->connector_ids) > 0);
head->pixel_buffer = ply_pixel_buffer_new (head->area.width, head->area.height);
ply_pixel_buffer_set_device_scale (head->pixel_buffer,
get_device_scale (head->area.width,
head->area.height,
connector->mmWidth,
connector->mmHeight));
ply_trace ("Creating %ldx%ld renderer head", head->area.width, head->area.height);
ply_pixel_buffer_fill_with_color (head->pixel_buffer, NULL,