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src/buffer: Automatically adapt to scale attribute

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Based on discussion in PR #389
This commit is contained in:
Consolatis 2022-06-12 21:11:25 +02:00 • committed by Johan Malm
parent 5626c20c44
commit 505f92e733
3 changed files with 17 additions and 4 deletions
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15
src/buffer.c
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@ -92,10 +92,23 @@ buffer_create_cairo(uint32_t width, uint32_t height, float scale,
if (!buffer) {
return NULL;
}
wlr_buffer_init(&buffer->base, &data_buffer_impl, width, height);
buffer->unscaled_width = width;
buffer->unscaled_height = height;
width *= scale;
height *= scale;
/* Allocate the buffer with the scaled size */
wlr_buffer_init(&buffer->base, &data_buffer_impl, width, height);
cairo_surface_t *surf =
cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
/**
* Tell cairo about the device scale so we can keep drawing in unscaled
* coordinate space. Pango will automatically use the cairo scale attribute
* as well when creating text on this surface.
*
* For a more complete explanation see PR #389
*/
cairo_surface_set_device_scale(surf, scale, scale);
buffer->cairo = cairo_create(surf);