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LibEDID: Fix calculating height and refresh rate for interlaced modes

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The vertical values need to be multiplied with 2 for interlaced modes.
This commit is contained in:
Tom 2022-01-24 10:56:32 -07:00 committed by Linus Groh
parent e04e52186d
commit 18fc54fc34
Notes: sideshowbarker 2024-07-17 20:17:54 +09:00 
Author: https://github.com/tomuta
Commit: https://github.com/SerenityOS/serenity/commit/18fc54fc348
Pull-request: https://github.com/SerenityOS/serenity/pull/12116
2 changed files with 11 additions and 3 deletions
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12
Userland/Libraries/LibEDID/EDID.cpp
View File

@ -672,13 +672,19 @@ u16 Parser::DetailedTiming::horizontal_blanking_pixels() const
return ((u16)high << 8) | (u16)low;
}
u16 Parser::DetailedTiming::vertical_addressable_lines() const
u16 Parser::DetailedTiming::vertical_addressable_lines_raw() const
{
u8 low = m_edid.read_host(&m_detailed_timings.vertical_addressable_lines_low);
u8 high = m_edid.read_host(&m_detailed_timings.vertical_addressable_and_blanking_lines_high) >> 4;
return ((u16)high << 8) | (u16)low;
}
u16 Parser::DetailedTiming::vertical_addressable_lines() const
{
auto lines = vertical_addressable_lines_raw();
return is_interlaced() ? lines * 2 : lines;
}
u16 Parser::DetailedTiming::vertical_blanking_lines() const
{
u8 low = m_edid.read_host(&m_detailed_timings.vertical_blanking_lines_low);
@ -745,9 +751,9 @@ bool Parser::DetailedTiming::is_interlaced() const
FixedPoint<16, u32> Parser::DetailedTiming::refresh_rate() const
{
// Blanking = front porch + sync pulse width = back porch
// Blanking = front porch + sync pulse width + back porch
u32 total_horizontal_pixels = (u32)horizontal_addressable_pixels() + (u32)horizontal_blanking_pixels();
u32 total_vertical_lines = (u32)vertical_addressable_lines() + (u32)vertical_blanking_lines();
u32 total_vertical_lines = (u32)vertical_addressable_lines_raw() + (u32)vertical_blanking_lines();
u32 total_pixels = total_horizontal_pixels * total_vertical_lines;
if (total_pixels == 0)
return {};

2
Userland/Libraries/LibEDID/EDID.h
View File

@ -349,6 +349,8 @@ public:
{
}
u16 vertical_addressable_lines_raw() const;
Parser const& m_edid;
Definitions::DetailedTiming const& m_detailed_timings;
};