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[Platform] [PC-98] Font ROM glyph retrieval 

Lol @ getting the glyph header field order wrong in 2021…

Part of P0232, funded by [Anonymous].
This commit is contained in:
nmlgc 2023-02-24 15:40:56 +01:00
parent e5d7c9489c
commit 03519d2af8
4 changed files with 51 additions and 5 deletions
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1
pc98.h
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@ -60,6 +60,7 @@ typedef unsigned int utram_y_t;
#define GLYPH_HALF_W 8
#define GLYPH_FULL_W 16
#define GLYPH_H 16
#define GLYPH_HALF_H 8
#define shiftjis_w(literal) \
((sizeof(literal) - 1) * GLYPH_HALF_W)

21
platform/x86real/pc98/font.cpp
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@ -20,6 +20,27 @@
// in the PC-98HA BIOS).
// • Emulators directly implement it in native code.
void font_read(font_glyph_t& glyph, jis_t jis)
{
_BX = FP_SEG(&glyph);
_CX = FP_OFF(&glyph);
_DX = jis;
_AH = 0x14;
geninterrupt(0x18);
glyph.tag.w *= GLYPH_HALF_W;
glyph.tag.h *= GLYPH_HALF_H;
}
void font_read(font_glyph_ank_8x8_t& glyph, ank_t ank)
{
font_read(reinterpret_cast<font_glyph_t &>(glyph), static_cast<jis_t>(ank));
}
void font_read(font_glyph_ank_8x16_t& glyph, ank_t ank)
{
font_read(reinterpret_cast<font_glyph_t &>(glyph), (0x8000 + ank));
}
void font_gaiji_write(
const dot_rect_t(GLYPH_FULL_W, GLYPH_H)* gaiji,
uint16_t count,

31
platform/x86real/pc98/font.hpp
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@ -1,12 +1,15 @@
// PC-98 font ROM access
// ---------------------
// Structure returned by INT 18h, AH=14h. The amount of bytes returned depends
// on the type of glyph (8×8, 8×16, or 16×16) as indicated by its codepoint,
// so make sure to allocate the correct subclass for it.
// Indicates the size of the glyph (8×8, 8×16, or 16×16), and by extension the
// amount of bytes returned from font_read().
struct font_glyph_header_t {
uint8_t tram_w;
uint8_t h_divided_by_8;
uint8_t h; // in pixels
uint8_t w; // in pixels
};
struct font_glyph_ank_8x8_t : public font_glyph_header_t {
dot_rect_t(GLYPH_HALF_W, GLYPH_HALF_H) dots;
};
struct font_glyph_ank_8x16_t : public font_glyph_header_t {
@ -17,6 +20,24 @@ struct font_glyph_kanji_t : public font_glyph_header_t {
dot_rect_t(GLYPH_FULL_W, GLYPH_H) dots;
};
// Tagged union for all possible glyph sizes returned from font_read().
struct font_glyph_t {
font_glyph_header_t tag;
union {
dot_rect_t(GLYPH_HALF_W, GLYPH_HALF_H) ank_8x8;
dot_rect_t(GLYPH_HALF_W, GLYPH_H) ank_8x16;
dot_rect_t(GLYPH_FULL_W, GLYPH_H) kanji;
};
};
// Reads the font ROM glyph for the given JIS codepoint.
void font_read(font_glyph_t& glyph, jis_t jis);
// Strongly-typed, memory-conserving wrappers around font_read() for smaller
// glyphs.
void font_read(font_glyph_ank_8x8_t& glyph, ank_t ank);
void font_read(font_glyph_ank_8x16_t& glyph, ank_t ank);
// Writes user-defined glyphs to the given offset inside the PC-98 gaiji RAM.
// The 256 possible gaiji IDs are mapped onto JIS X 0208 codepoints as follows:
//

3
shiftjis.hpp
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@ -1,3 +1,6 @@
// 1-byte JIS X 0201 codepoint (ASCII, numeric, or halfwidth katakana).
typedef uint8_t ank_t;
// 2-byte JIS X 0208 codepoint.
typedef uint16_t jis_t;