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driver_manager: improve fb-driver selection

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This is a follup-up commit for "driver_manager: add fb_boot_drv
support". It refines the heuristics for selecting the most suitable
framebuffer driver be prevent boot_fb_drv from being preferred over
the VESA driver when running in Qemu.
This commit is contained in:
Alexander Boettcher 2017-11-01 20:29:49 +01:00 committed by Christian Helmuth
parent 9d0518661b
commit 0b09cc8cf6
1 changed files with 12 additions and 7 deletions
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19
repos/gems/src/app/driver_manager/main.cc
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@ -163,20 +163,25 @@ struct Driver_manager::Boot_fb_driver : Device_driver
struct Mode
{
unsigned _width = 0, _height = 0, _bpp = 0;
enum { TYPE_RGB_COLOR = 1 };
unsigned _pitch = 0, _height = 0;
Mode() { }
Mode(Xml_node node)
:
_width (node.attribute_value("width", 0U)),
_height(node.attribute_value("height", 0U)),
_bpp (node.attribute_value("bpp", 0U))
{ }
_pitch(node.attribute_value("pitch", 0U)),
_height(node.attribute_value("height", 0U))
{
/* check for unsupported type */
if (node.attribute_value("type", 0U) != TYPE_RGB_COLOR)
_pitch = _height = 0;
}
size_t num_bytes() const { return _width * _height * _bpp/8 + 512*1024; }
size_t num_bytes() const { return _pitch * _height + 512*1024; }
bool valid() const { return _width*_height*_bpp != 0; }
bool valid() const { return _pitch * _height != 0; }
};
Boot_fb_driver(Mode const mode) : _ram_quota(Ram_quota{mode.num_bytes()}) { }