feat: io: serial & console
This commit is contained in:
Karina
@@ -19,6 +19,9 @@ target_include_directories(shitgui PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include")
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add_executable(kernel
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src/kmain.c
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src/modules/memory.c
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src/modules/serial.c
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src/modules/console.c
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data/font8x8_basic.c
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)
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target_include_directories(kernel PRIVATE
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@@ -43,4 +46,9 @@ set_target_properties(kernel PROPERTIES
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add_custom_command(TARGET kernel POST_BUILD
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COMMAND objcopy -O binary $<TARGET_FILE:kernel> $<TARGET_FILE_DIR:kernel>/kernel.bin
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COMMENT "Stripping ELF headers -> kernel.bin"
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)
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file(GLOB_RECURSE SOURCES
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"src/*.c"
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"data/*.c"
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)
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@@ -0,0 +1,152 @@
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/**
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* 8x8 monochrome bitmap fonts for rendering
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* Author: Daniel Hepper <daniel@hepper.net>
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*
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* License: Public Domain
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*
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* Based on:
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* // Summary: font8x8.h
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* // 8x8 monochrome bitmap fonts for rendering
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* //
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* // Author:
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* // Marcel Sondaar
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* // International Business Machines (public domain VGA fonts)
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* //
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* // License:
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* // Public Domain
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*
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* Fetched from: http://dimensionalrift.homelinux.net/combuster/mos3/?p=viewsource&file=/modules/gfx/font8_8.asm
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**/
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// Constant: font8x8_basic
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// Contains an 8x8 font map for unicode points U+0000 - U+007F (basic latin)
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char font8x8_basic[128][8] = {
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0000 (nul)
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0001
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0002
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0003
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0004
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0005
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0006
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0007
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0008
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0009
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+000A
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+000B
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+000C
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+000D
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+000E
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+000F
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0010
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0011
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0012
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0013
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0014
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0015
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0016
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0017
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0018
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0019
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+001A
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+001B
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+001C
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+001D
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+001E
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+001F
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0020 (space)
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{ 0x18, 0x3C, 0x3C, 0x18, 0x18, 0x00, 0x18, 0x00}, // U+0021 (!)
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{ 0x36, 0x36, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0022 (")
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{ 0x36, 0x36, 0x7F, 0x36, 0x7F, 0x36, 0x36, 0x00}, // U+0023 (#)
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{ 0x0C, 0x3E, 0x03, 0x1E, 0x30, 0x1F, 0x0C, 0x00}, // U+0024 ($)
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{ 0x00, 0x63, 0x33, 0x18, 0x0C, 0x66, 0x63, 0x00}, // U+0025 (%)
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{ 0x1C, 0x36, 0x1C, 0x6E, 0x3B, 0x33, 0x6E, 0x00}, // U+0026 (&)
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{ 0x06, 0x06, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0027 (')
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{ 0x18, 0x0C, 0x06, 0x06, 0x06, 0x0C, 0x18, 0x00}, // U+0028 (()
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{ 0x06, 0x0C, 0x18, 0x18, 0x18, 0x0C, 0x06, 0x00}, // U+0029 ())
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{ 0x00, 0x66, 0x3C, 0xFF, 0x3C, 0x66, 0x00, 0x00}, // U+002A (*)
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{ 0x00, 0x0C, 0x0C, 0x3F, 0x0C, 0x0C, 0x00, 0x00}, // U+002B (+)
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x0C, 0x0C, 0x06}, // U+002C (,)
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{ 0x00, 0x00, 0x00, 0x3F, 0x00, 0x00, 0x00, 0x00}, // U+002D (-)
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x0C, 0x0C, 0x00}, // U+002E (.)
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{ 0x60, 0x30, 0x18, 0x0C, 0x06, 0x03, 0x01, 0x00}, // U+002F (/)
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{ 0x3E, 0x63, 0x73, 0x7B, 0x6F, 0x67, 0x3E, 0x00}, // U+0030 (0)
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{ 0x0C, 0x0E, 0x0C, 0x0C, 0x0C, 0x0C, 0x3F, 0x00}, // U+0031 (1)
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{ 0x1E, 0x33, 0x30, 0x1C, 0x06, 0x33, 0x3F, 0x00}, // U+0032 (2)
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{ 0x1E, 0x33, 0x30, 0x1C, 0x30, 0x33, 0x1E, 0x00}, // U+0033 (3)
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{ 0x38, 0x3C, 0x36, 0x33, 0x7F, 0x30, 0x78, 0x00}, // U+0034 (4)
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{ 0x3F, 0x03, 0x1F, 0x30, 0x30, 0x33, 0x1E, 0x00}, // U+0035 (5)
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{ 0x1C, 0x06, 0x03, 0x1F, 0x33, 0x33, 0x1E, 0x00}, // U+0036 (6)
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{ 0x3F, 0x33, 0x30, 0x18, 0x0C, 0x0C, 0x0C, 0x00}, // U+0037 (7)
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{ 0x1E, 0x33, 0x33, 0x1E, 0x33, 0x33, 0x1E, 0x00}, // U+0038 (8)
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{ 0x1E, 0x33, 0x33, 0x3E, 0x30, 0x18, 0x0E, 0x00}, // U+0039 (9)
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{ 0x00, 0x0C, 0x0C, 0x00, 0x00, 0x0C, 0x0C, 0x00}, // U+003A (:)
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{ 0x00, 0x0C, 0x0C, 0x00, 0x00, 0x0C, 0x0C, 0x06}, // U+003B (;)
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{ 0x18, 0x0C, 0x06, 0x03, 0x06, 0x0C, 0x18, 0x00}, // U+003C (<)
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{ 0x00, 0x00, 0x3F, 0x00, 0x00, 0x3F, 0x00, 0x00}, // U+003D (=)
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{ 0x06, 0x0C, 0x18, 0x30, 0x18, 0x0C, 0x06, 0x00}, // U+003E (>)
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{ 0x1E, 0x33, 0x30, 0x18, 0x0C, 0x00, 0x0C, 0x00}, // U+003F (?)
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{ 0x3E, 0x63, 0x7B, 0x7B, 0x7B, 0x03, 0x1E, 0x00}, // U+0040 (@)
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{ 0x0C, 0x1E, 0x33, 0x33, 0x3F, 0x33, 0x33, 0x00}, // U+0041 (A)
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{ 0x3F, 0x66, 0x66, 0x3E, 0x66, 0x66, 0x3F, 0x00}, // U+0042 (B)
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{ 0x3C, 0x66, 0x03, 0x03, 0x03, 0x66, 0x3C, 0x00}, // U+0043 (C)
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{ 0x1F, 0x36, 0x66, 0x66, 0x66, 0x36, 0x1F, 0x00}, // U+0044 (D)
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{ 0x7F, 0x46, 0x16, 0x1E, 0x16, 0x46, 0x7F, 0x00}, // U+0045 (E)
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{ 0x7F, 0x46, 0x16, 0x1E, 0x16, 0x06, 0x0F, 0x00}, // U+0046 (F)
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{ 0x3C, 0x66, 0x03, 0x03, 0x73, 0x66, 0x7C, 0x00}, // U+0047 (G)
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{ 0x33, 0x33, 0x33, 0x3F, 0x33, 0x33, 0x33, 0x00}, // U+0048 (H)
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{ 0x1E, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x1E, 0x00}, // U+0049 (I)
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{ 0x78, 0x30, 0x30, 0x30, 0x33, 0x33, 0x1E, 0x00}, // U+004A (J)
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{ 0x67, 0x66, 0x36, 0x1E, 0x36, 0x66, 0x67, 0x00}, // U+004B (K)
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{ 0x0F, 0x06, 0x06, 0x06, 0x46, 0x66, 0x7F, 0x00}, // U+004C (L)
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{ 0x63, 0x77, 0x7F, 0x7F, 0x6B, 0x63, 0x63, 0x00}, // U+004D (M)
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{ 0x63, 0x67, 0x6F, 0x7B, 0x73, 0x63, 0x63, 0x00}, // U+004E (N)
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{ 0x1C, 0x36, 0x63, 0x63, 0x63, 0x36, 0x1C, 0x00}, // U+004F (O)
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{ 0x3F, 0x66, 0x66, 0x3E, 0x06, 0x06, 0x0F, 0x00}, // U+0050 (P)
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{ 0x1E, 0x33, 0x33, 0x33, 0x3B, 0x1E, 0x38, 0x00}, // U+0051 (Q)
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{ 0x3F, 0x66, 0x66, 0x3E, 0x36, 0x66, 0x67, 0x00}, // U+0052 (R)
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{ 0x1E, 0x33, 0x07, 0x0E, 0x38, 0x33, 0x1E, 0x00}, // U+0053 (S)
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{ 0x3F, 0x2D, 0x0C, 0x0C, 0x0C, 0x0C, 0x1E, 0x00}, // U+0054 (T)
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{ 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x3F, 0x00}, // U+0055 (U)
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{ 0x33, 0x33, 0x33, 0x33, 0x33, 0x1E, 0x0C, 0x00}, // U+0056 (V)
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{ 0x63, 0x63, 0x63, 0x6B, 0x7F, 0x77, 0x63, 0x00}, // U+0057 (W)
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{ 0x63, 0x63, 0x36, 0x1C, 0x1C, 0x36, 0x63, 0x00}, // U+0058 (X)
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{ 0x33, 0x33, 0x33, 0x1E, 0x0C, 0x0C, 0x1E, 0x00}, // U+0059 (Y)
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{ 0x7F, 0x63, 0x31, 0x18, 0x4C, 0x66, 0x7F, 0x00}, // U+005A (Z)
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{ 0x1E, 0x06, 0x06, 0x06, 0x06, 0x06, 0x1E, 0x00}, // U+005B ([)
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{ 0x03, 0x06, 0x0C, 0x18, 0x30, 0x60, 0x40, 0x00}, // U+005C (\)
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{ 0x1E, 0x18, 0x18, 0x18, 0x18, 0x18, 0x1E, 0x00}, // U+005D (])
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{ 0x08, 0x1C, 0x36, 0x63, 0x00, 0x00, 0x00, 0x00}, // U+005E (^)
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF}, // U+005F (_)
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{ 0x0C, 0x0C, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0060 (`)
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{ 0x00, 0x00, 0x1E, 0x30, 0x3E, 0x33, 0x6E, 0x00}, // U+0061 (a)
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{ 0x07, 0x06, 0x06, 0x3E, 0x66, 0x66, 0x3B, 0x00}, // U+0062 (b)
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{ 0x00, 0x00, 0x1E, 0x33, 0x03, 0x33, 0x1E, 0x00}, // U+0063 (c)
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{ 0x38, 0x30, 0x30, 0x3e, 0x33, 0x33, 0x6E, 0x00}, // U+0064 (d)
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{ 0x00, 0x00, 0x1E, 0x33, 0x3f, 0x03, 0x1E, 0x00}, // U+0065 (e)
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{ 0x1C, 0x36, 0x06, 0x0f, 0x06, 0x06, 0x0F, 0x00}, // U+0066 (f)
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{ 0x00, 0x00, 0x6E, 0x33, 0x33, 0x3E, 0x30, 0x1F}, // U+0067 (g)
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{ 0x07, 0x06, 0x36, 0x6E, 0x66, 0x66, 0x67, 0x00}, // U+0068 (h)
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{ 0x0C, 0x00, 0x0E, 0x0C, 0x0C, 0x0C, 0x1E, 0x00}, // U+0069 (i)
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{ 0x30, 0x00, 0x30, 0x30, 0x30, 0x33, 0x33, 0x1E}, // U+006A (j)
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{ 0x07, 0x06, 0x66, 0x36, 0x1E, 0x36, 0x67, 0x00}, // U+006B (k)
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{ 0x0E, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x1E, 0x00}, // U+006C (l)
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{ 0x00, 0x00, 0x33, 0x7F, 0x7F, 0x6B, 0x63, 0x00}, // U+006D (m)
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{ 0x00, 0x00, 0x1F, 0x33, 0x33, 0x33, 0x33, 0x00}, // U+006E (n)
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{ 0x00, 0x00, 0x1E, 0x33, 0x33, 0x33, 0x1E, 0x00}, // U+006F (o)
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{ 0x00, 0x00, 0x3B, 0x66, 0x66, 0x3E, 0x06, 0x0F}, // U+0070 (p)
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{ 0x00, 0x00, 0x6E, 0x33, 0x33, 0x3E, 0x30, 0x78}, // U+0071 (q)
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{ 0x00, 0x00, 0x3B, 0x6E, 0x66, 0x06, 0x0F, 0x00}, // U+0072 (r)
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{ 0x00, 0x00, 0x3E, 0x03, 0x1E, 0x30, 0x1F, 0x00}, // U+0073 (s)
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{ 0x08, 0x0C, 0x3E, 0x0C, 0x0C, 0x2C, 0x18, 0x00}, // U+0074 (t)
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{ 0x00, 0x00, 0x33, 0x33, 0x33, 0x33, 0x6E, 0x00}, // U+0075 (u)
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{ 0x00, 0x00, 0x33, 0x33, 0x33, 0x1E, 0x0C, 0x00}, // U+0076 (v)
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{ 0x00, 0x00, 0x63, 0x6B, 0x7F, 0x7F, 0x36, 0x00}, // U+0077 (w)
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{ 0x00, 0x00, 0x63, 0x36, 0x1C, 0x36, 0x63, 0x00}, // U+0078 (x)
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{ 0x00, 0x00, 0x33, 0x33, 0x33, 0x3E, 0x30, 0x1F}, // U+0079 (y)
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{ 0x00, 0x00, 0x3F, 0x19, 0x0C, 0x26, 0x3F, 0x00}, // U+007A (z)
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{ 0x38, 0x0C, 0x0C, 0x07, 0x0C, 0x0C, 0x38, 0x00}, // U+007B ({)
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{ 0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x18, 0x00}, // U+007C (|)
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{ 0x07, 0x0C, 0x0C, 0x38, 0x0C, 0x0C, 0x07, 0x00}, // U+007D (})
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{ 0x6E, 0x3B, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+007E (~)
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00} // U+007F
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};
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@@ -0,0 +1,10 @@
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#ifndef CONSOLE_H
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#define CONSOLE_H
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#include "shitgui.h"
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void console_init(SG_Context *ctx);
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void console_set_color(u32 color);
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void kprint(const char *str);
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#endif
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@@ -0,0 +1,8 @@
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#ifndef FONT_H
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#define FONT_H
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#include "types.h"
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extern u8 font8x8_basic[128][8];
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#endif
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@@ -0,0 +1,18 @@
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static inline void outb(unsigned short port, unsigned char val) {
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__asm__ volatile(
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"outb %0, %1"
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:
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: "a"(val),
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"Nd"(port) );
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}
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static inline unsigned char inb(unsigned short port) {
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unsigned char ret;
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__asm__ volatile(
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"inb %1, %0"
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: "=a"(ret)
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: "Nd"(port)
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);
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return ret;
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}
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@@ -0,0 +1,8 @@
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#ifndef SERIAL_H
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#define SERIAL_H
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int serial_init();
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void serial_writec(char chr);
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void serial_write(const char *str);
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#endif
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@@ -20,11 +20,13 @@ typedef struct {
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} SG_Image;
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typedef struct {
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u32 font_w;
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u32 font_h;
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} SG_FontMetrics;
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u32 w;
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u32 h;
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const unsigned char* base;
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} SG_Font;
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void sg_put_img(SG_Context *ctx, SG_Point *p, SG_Image *img);
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void sg_draw_rect(SG_Context *ctx, SG_Point *p, u32 w, u32 h, u32 color);
|
||||
void sg_draw_char_bitmap(SG_Context *ctx, SG_Point *p, char c, u32 color, SG_Font *font);
|
||||
|
||||
#endif
|
||||
@@ -1,7 +1,9 @@
|
||||
#include "../../common/bootinfo.h"
|
||||
#include "console.h"
|
||||
#include "types.h"
|
||||
|
||||
#include "shitgui.h"
|
||||
#include "serial.h"
|
||||
|
||||
void kmain(Bootinfo* info) {
|
||||
u32 *fb = (u32*)info->base;
|
||||
@@ -29,5 +31,11 @@ void kmain(Bootinfo* info) {
|
||||
p.y += stripe_h;
|
||||
sg_draw_rect(&sg_ctx, &p, info->width, stripe_h, 0x5BCEFA);
|
||||
|
||||
serial_init();
|
||||
console_init(&sg_ctx);
|
||||
console_set_color(0x000000);
|
||||
kprint("Hello!!!");
|
||||
for (int i = 0; i < 1000; i++) kprint("!");
|
||||
|
||||
while (1) { __asm__("hlt"); }
|
||||
}
|
||||
@@ -0,0 +1,44 @@
|
||||
#include "console.h"
|
||||
#include "serial.h"
|
||||
#include "font.h"
|
||||
#include "shitgui.h"
|
||||
|
||||
static SG_Context *ctx_ptr = nullptr;
|
||||
static SG_Point s_cursor_pos = {0};
|
||||
static SG_Font s_font = {0};
|
||||
static u32 s_color = 0xFFFFFF;
|
||||
|
||||
void console_init(SG_Context *ctx) {
|
||||
ctx_ptr = ctx;
|
||||
s_cursor_pos.x = 0;
|
||||
s_cursor_pos.y = 0;
|
||||
|
||||
s_font.h = 8;
|
||||
s_font.w = 8;
|
||||
s_font.base = (const unsigned char*)font8x8_basic;
|
||||
}
|
||||
|
||||
static void console_putc(char c) {
|
||||
serial_writec(c);
|
||||
if (!ctx_ptr) return;
|
||||
if (c == '\n') {
|
||||
s_cursor_pos.x = 0;
|
||||
s_cursor_pos.y += s_font.h;
|
||||
} else {
|
||||
sg_draw_char_bitmap(ctx_ptr, &s_cursor_pos, c, s_color, &s_font);
|
||||
s_cursor_pos.x += s_font.w;
|
||||
}
|
||||
|
||||
if (s_cursor_pos.x >= ctx_ptr->width) {
|
||||
s_cursor_pos.x = 0;
|
||||
s_cursor_pos.y += s_font.h;
|
||||
}
|
||||
}
|
||||
|
||||
void console_set_color(u32 color) {
|
||||
s_color = color;
|
||||
}
|
||||
|
||||
void kprint(const char *str) {
|
||||
for (int i = 0; str[i] != '\0'; i++) console_putc(str[i]);
|
||||
}
|
||||
@@ -1,3 +1,4 @@
|
||||
#include "memory.h"
|
||||
#include "types.h"
|
||||
|
||||
void *memset(void *ptr, int value, usize num) {
|
||||
|
||||
@@ -0,0 +1,28 @@
|
||||
#include "serial.h"
|
||||
#include "io.h"
|
||||
|
||||
#define PORT 0x3F8 // com1
|
||||
|
||||
int serial_init() {
|
||||
outb(PORT + 1, 0x00); // interrupt enable register (+1) / disable interruptions
|
||||
outb(PORT + 3, 0x80); // line control register (+3)
|
||||
outb(PORT + 0, 0x03); // speed : low byte
|
||||
outb(PORT + 1, 0x00); // speed : high byte
|
||||
outb(PORT + 3, 0x03); // line control register (+3) / reset DLAB / no parity / 1 stop bit / (8N1)
|
||||
outb(PORT + 2, 0xC7); // FIFO Control register (+2) / 1100 0111 / last ones are enable FIFO buff / first ones to clean noise
|
||||
outb(PORT + 4, 0x0B); // ready :3
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int is_transmit_empty() {
|
||||
return inb(PORT + 5) & 0x20; // checking 5th bit LSR
|
||||
}
|
||||
|
||||
void serial_writec(char chr) {
|
||||
while (is_transmit_empty() == 0); // waiting for buffer to flush (spinlock)
|
||||
outb(PORT, chr);
|
||||
}
|
||||
|
||||
void serial_write(const char *str) {
|
||||
for (int i = 0; str[i] != '\0'; i++) serial_writec(str[i]);
|
||||
}
|
||||
@@ -42,4 +42,27 @@ void sg_draw_rect(SG_Context *ctx, SG_Point *p, u32 w, u32 h, u32 color) {
|
||||
volatile u32 *row_ptr = &ctx->fb[(start_y + y) * ctx->pitch + start_x];
|
||||
for (u32 x = 0; x < draw_w; x++) row_ptr[x] = color;
|
||||
}
|
||||
}
|
||||
|
||||
void sg_draw_char_bitmap(SG_Context *ctx, SG_Point *p, char c, u32 color, SG_Font *font) {
|
||||
if (!ctx->fb) return;
|
||||
|
||||
u32 start_x = p->x;
|
||||
u32 start_y = p->y;
|
||||
u32 draw_w = font->w;
|
||||
u32 draw_h = font->h;
|
||||
|
||||
if (start_x >= ctx->width || start_y >= ctx->height) return;
|
||||
if (start_x + draw_w > ctx->width) draw_w = ctx->width - start_x;
|
||||
if (start_y + draw_h > ctx->height) draw_h = ctx->height - start_y;
|
||||
|
||||
for (u32 y = 0; y < draw_h; y++) {
|
||||
u8 bitmap_row = font->base[(unsigned char)c * font->h + y];
|
||||
volatile u32 *row_ptr = &ctx->fb[(start_y + y) * ctx->pitch + start_x];
|
||||
for (u32 x = 0; x < draw_w; x++) {
|
||||
if (bitmap_row & (1 << (font->w - 1 - x))) {
|
||||
row_ptr[x] = color;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user