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Kernel/Console: Tidy up code a little

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- Remove some magic numbers
- Remove some duplicate branches
- Reduce the amount of casting between u8* and u32*
- Some renaming of confusing variables
This commit is contained in:
MacDue 2022-06-08 12:00:05 +01:00 committed by Andreas Kling
parent 805a3d5b29
commit 348750a9f4
Notes: sideshowbarker 2024-07-17 10:21:57 +09:00 
Author: https://github.com/MacDue
Commit: https://github.com/SerenityOS/serenity/commit/348750a9f4
Pull-request: https://github.com/SerenityOS/serenity/pull/14213
2 changed files with 45 additions and 45 deletions
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75
Kernel/Graphics/Console/GenericFramebufferConsole.cpp
View file

@ -1,5 +1,6 @@
/*
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
* Copyright (c) 2022, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -206,9 +207,10 @@ size_t GenericFramebufferConsoleImpl::bytes_per_base_glyph() const
// FIXME: We assume we have 32 bit bpp framebuffer.
return 8 * 32;
}
size_t GenericFramebufferConsoleImpl::chars_per_line() const
{
return width() / bytes_per_base_glyph();
return max_column();
}
void GenericFramebufferConsoleImpl::set_cursor(size_t x, size_t y)
@ -219,40 +221,39 @@ void GenericFramebufferConsoleImpl::set_cursor(size_t x, size_t y)
show_cursor();
}
u32* GenericFramebufferConsoleImpl::framebuffer_offset(size_t x, size_t y)
GenericFramebufferConsoleImpl::FramebufferOffset GenericFramebufferConsoleImpl::framebuffer_offset(size_t x, size_t y)
{
return reinterpret_cast<u32*>(&framebuffer_data()[x * sizeof(u32) * (m_pixels_per_column + m_glyph_spacing) + y * m_pixels_per_row * framebuffer_pitch()]);
return { (&framebuffer_data()[x * sizeof(u32) * (m_glyph_columns + m_glyph_spacing) + y * m_glyph_rows * framebuffer_pitch()]) };
}
void GenericFramebufferConsoleImpl::hide_cursor()
{
auto* offset_in_framebuffer = framebuffer_offset(m_x, m_y);
offset_in_framebuffer = (u32*)((u8*)offset_in_framebuffer + framebuffer_pitch() * 15);
for (size_t current_x = 0; current_x < m_pixels_per_column; current_x++) {
offset_in_framebuffer[current_x] = m_cursor_overriden_pixels[current_x];
}
auto offset_in_framebuffer = framebuffer_offset(m_x, m_y);
offset_in_framebuffer.bytes += framebuffer_pitch() * (m_glyph_rows - 1);
for (size_t glyph_column = 0; glyph_column < m_glyph_columns; glyph_column++)
offset_in_framebuffer.pixels[glyph_column] = m_cursor_overriden_pixels[glyph_column];
}
void GenericFramebufferConsoleImpl::show_cursor()
{
auto* offset_in_framebuffer = framebuffer_offset(m_x, m_y);
offset_in_framebuffer = (u32*)((u8*)offset_in_framebuffer + framebuffer_pitch() * 15);
for (size_t current_x = 0; current_x < m_pixels_per_column; current_x++) {
m_cursor_overriden_pixels[current_x] = offset_in_framebuffer[current_x];
memset(offset_in_framebuffer + current_x, 0xff, 4);
auto offset_in_framebuffer = framebuffer_offset(m_x, m_y);
offset_in_framebuffer.bytes += framebuffer_pitch() * (m_glyph_rows - 1);
for (size_t glyph_column = 0; glyph_column < m_glyph_columns; glyph_column++) {
m_cursor_overriden_pixels[glyph_column] = offset_in_framebuffer.pixels[glyph_column];
memset(offset_in_framebuffer.pixels + glyph_column, 0xff, sizeof(u32));
}
}
void GenericFramebufferConsoleImpl::clear(size_t x, size_t y, size_t length)
{
if (x == 0 && length == max_column()) {
// if we need to clear the entire row, just clean it with quick memset :)
auto* offset_in_framebuffer = framebuffer_offset(x, y);
for (size_t current_x = 0; current_x < m_pixels_per_row; current_x++) {
memset(offset_in_framebuffer, 0, framebuffer_pitch());
offset_in_framebuffer = (u32*)((u8*)offset_in_framebuffer + framebuffer_pitch());
// If we need to clear the entire row, just clean it with quick memset :)
auto offset_in_framebuffer = framebuffer_offset(x, y);
for (size_t glyph_row = 0; glyph_row < m_glyph_rows; glyph_row++) {
memset(offset_in_framebuffer.pixels, 0, framebuffer_pitch());
offset_in_framebuffer.bytes += framebuffer_pitch();
}
flush(0, m_pixels_per_row * y, (m_pixels_per_column + m_glyph_spacing) * length, 1);
flush(0, m_glyph_rows * y, (m_glyph_columns + m_glyph_spacing) * length, 1);
return;
}
for (size_t index = 0; index < length; index++) {
@ -262,10 +263,10 @@ void GenericFramebufferConsoleImpl::clear(size_t x, size_t y, size_t length)
if (y >= max_row())
y = 0;
}
auto* offset_in_framebuffer = framebuffer_offset(x, y);
for (size_t current_x = 0; current_x < m_pixels_per_row; current_x++) {
memset(offset_in_framebuffer, 0, m_pixels_per_column * sizeof(u32));
offset_in_framebuffer = (u32*)((u8*)offset_in_framebuffer + framebuffer_pitch());
auto offset_in_framebuffer = framebuffer_offset(x, y);
for (size_t glyph_row = 0; glyph_row < m_glyph_rows; glyph_row++) {
memset(offset_in_framebuffer.pixels, 0, m_glyph_columns * sizeof(u32));
offset_in_framebuffer.bytes += framebuffer_pitch();
}
flush_glyph(x, y);
}
@ -273,10 +274,10 @@ void GenericFramebufferConsoleImpl::clear(size_t x, size_t y, size_t length)
void GenericFramebufferConsoleImpl::clear_glyph(size_t x, size_t y)
{
auto* offset_in_framebuffer = framebuffer_offset(x, y);
for (size_t current_x = 0; current_x < m_pixels_per_row; current_x++) {
memset(offset_in_framebuffer, 0, m_pixels_per_column * sizeof(u32));
offset_in_framebuffer = (u32*)((u8*)offset_in_framebuffer + framebuffer_pitch());
auto offset_in_framebuffer = framebuffer_offset(x, y);
for (size_t glyph_row = 0; glyph_row < m_glyph_rows; glyph_row++) {
memset(offset_in_framebuffer.pixels, 0, m_glyph_columns * sizeof(u32));
offset_in_framebuffer.bytes += framebuffer_pitch();
}
flush_glyph(x, y);
}
@ -312,22 +313,16 @@ void GenericFramebufferConsoleImpl::write(size_t x, size_t y, char ch, Color bac
return;
}
clear_glyph(x, y);
auto* offset_in_framebuffer = framebuffer_offset(x, y);
size_t current_bitpixels = 0;
size_t current_bitpixel = 0;
auto bitmap = font_cathode_8x16[(int)ch];
bool set;
auto offset_in_framebuffer = framebuffer_offset(x, y);
BGRColor foreground_color = convert_standard_color_to_bgr_color(foreground);
BGRColor background_color = convert_standard_color_to_bgr_color(background);
for (current_bitpixels = 0; current_bitpixels < m_pixels_per_row; current_bitpixels++) {
for (current_bitpixel = m_pixels_per_column; current_bitpixel > 0; current_bitpixel--) {
set = bitmap[current_bitpixels] & (1 << current_bitpixel);
if (set)
offset_in_framebuffer[m_pixels_per_column - current_bitpixel] = foreground_color;
else
offset_in_framebuffer[m_pixels_per_column - current_bitpixel] = background_color;
for (size_t glyph_row = 0; glyph_row < m_glyph_rows; glyph_row++) {
for (size_t glyph_column = m_glyph_columns; glyph_column > 0; glyph_column--) {
bool pixel_set = bitmap[glyph_row] & (1 << glyph_column);
offset_in_framebuffer.pixels[m_glyph_columns - glyph_column] = pixel_set ? foreground_color : background_color;
}
offset_in_framebuffer = (u32*)((u8*)offset_in_framebuffer + framebuffer_pitch());
offset_in_framebuffer.bytes += framebuffer_pitch();
}
flush_glyph(x, y);
m_x = x + 1;
@ -341,7 +336,7 @@ void GenericFramebufferConsoleImpl::write(size_t x, size_t y, char ch, Color bac
void GenericFramebufferConsoleImpl::flush_glyph(size_t x, size_t y)
{
flush((m_pixels_per_column + m_glyph_spacing) * x, m_pixels_per_row * y, m_pixels_per_column + m_glyph_spacing, m_pixels_per_row);
flush((m_glyph_columns + m_glyph_spacing) * x, m_glyph_rows * y, m_glyph_columns + m_glyph_spacing, m_glyph_rows);
}
void GenericFramebufferConsoleImpl::write(size_t x, size_t y, char ch, bool critical)

15
Kernel/Graphics/Console/GenericFramebufferConsole.h
View file

@ -18,8 +18,8 @@ public:
virtual size_t bytes_per_base_glyph() const override;
virtual size_t chars_per_line() const override;
virtual size_t max_column() const override { return m_width / (m_pixels_per_column + m_glyph_spacing); }
virtual size_t max_row() const override { return m_height / m_pixels_per_row; }
virtual size_t max_column() const override { return m_width / (m_glyph_columns + m_glyph_spacing); }
virtual size_t max_row() const override { return m_height / m_glyph_rows; }
virtual bool is_hardware_paged_capable() const override { return false; }
virtual bool has_hardware_cursor() const override { return false; }
@ -48,12 +48,17 @@ protected:
virtual u8* framebuffer_data() = 0;
size_t framebuffer_pitch() const { return m_pitch; }
virtual void clear_glyph(size_t x, size_t y);
u32* framebuffer_offset(size_t x, size_t y);
union FramebufferOffset {
u8* bytes;
u32* pixels;
};
FramebufferOffset framebuffer_offset(size_t x, size_t y);
void flush_glyph(size_t x, size_t y);
size_t const m_glyph_spacing { 1 };
size_t const m_pixels_per_column { 8 };
size_t const m_pixels_per_row { 16 };
size_t const m_glyph_columns { 8 };
size_t const m_glyph_rows { 16 };
Array<u32, 8> m_cursor_overriden_pixels;