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blit16.h
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blit16.h
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/* ISC License
* Copyright (c) 2018 Andrew Reece
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef blit16_H
#define blit16_WIDTH 3
#define blit16_HEIGHT 5
#define blit16_ADVANCE (blit16_WIDTH + 1)
#define blit16_DESCENDER 1
#define blit16_BASELINE_OFFSET (blit16_DESCENDER + 1)
#define blit16_ROW_ADVANCE (blit16_HEIGHT + blit16_BASELINE_OFFSET)
#define blit16_EXTRA_BITS(x) (((x) >> 15) & 1)
typedef unsigned short blit16_glyph;
#ifndef blit_H
#ifndef blit_pixel
#define blit_pixel unsigned int
#endif/*blit_pixel*/
#ifndef blit_NO_INLINE
#define blit_inline inline
#else /*blit_NO_INLINE*/
#define blit_inline
#endif/*blit_NO_INLINE*/
#define blit_NUM_GLYPHS 95
#define blit_IndexFromASCII(ascii) (ascii - ' ')
#define blit_ASCIIFromIndex(index) (index + ' ')
typedef struct blit_props
{
blit_pixel *Buffer;
blit_pixel Value;
int Scale;
int BufWidth;
int BufHeight;
enum {blit_Clip, blit_Wrap} Wrap;
} blit_props;
#define blit_H
#endif/*blit_H*/
#ifndef blit16_ARRAY_ONLY
#define blit16_Glyphs Blit16.Glyphs
typedef struct blit16_font
{
const blit16_glyph Glyphs[blit_NUM_GLYPHS];
const unsigned int Width;
const unsigned int Height;
const unsigned int Descender;
const unsigned int Advance;
const unsigned int RowAdvance;
blit_props Props;
} blit16_font;
#define blit16_SCALE(Font, scale) Font->Props.Scale = scale; \
*(unsigned int *)&Font->Width = blit16_WIDTH * scale; \
*(unsigned int *)&Font->Height = blit16_HEIGHT * scale; \
*(unsigned int *)&Font->Descender = blit16_DESCENDER * scale; \
*(unsigned int *)&Font->Advance = blit16_ADVANCE * scale; \
*(unsigned int *)&Font->RowAdvance = blit16_ROW_ADVANCE * scale
#ifndef blit16_MACRO_INLINE
blit_inline void blit16_Scale(blit16_font *Font, int Scale) { blit16_SCALE(Font, Scale); }
#else /*blit16_MACRO_INLINE*/
#define blit16_Scale(Font, scale) \
do { int blit16_TempScale = (scale); blit16_SCALE((Font), blit16_TempScale); } while (0)
#endif/*blit16_MACRO_INLINE*/
blit16_font Blit16 = {
#else/*blit16_ARRAY_ONLY*/
blit16_glyph blit16_Glyphs[blit_NUM_GLYPHS] =
#endif/*blit16_ARRAY_ONLY*/
{
/* all chars up to 32 are non-printable */
0x0000,0x2092,0x002d,0x5f7d,0x279e,0x52a5,0x7ad6,0x0012,
0x4494,0x1491,0x0aba,0x05d0,0x1400,0x01c0,0x0400,0x12a4,
0x2b6a,0x749a,0x752a,0x38a3,0x4f4a,0x38cf,0x3bce,0x12a7,
0x3aae,0x49ae,0x0410,0x1410,0x4454,0x0e38,0x1511,0x10e3,
0x73ee,0x5f7a,0x3beb,0x624e,0x3b6b,0x73cf,0x13cf,0x6b4e,
0x5bed,0x7497,0x2b27,0x5add,0x7249,0x5b7d,0x5b6b,0x3b6e,
0x12eb,0x4f6b,0x5aeb,0x388e,0x2497,0x6b6d,0x256d,0x5f6d,
0x5aad,0x24ad,0x72a7,0x6496,0x4889,0x3493,0x002a,0xf000,
0x0011,0x6b98,0x3b79,0x7270,0x7b74,0x6750,0x95d6,0xb9ee,
0x5b59,0x6410,0xb482,0x56e8,0x6492,0x5be8,0x5b58,0x3b70,
0x976a,0xcd6a,0x1370,0x38f0,0x64ba,0x3b68,0x2568,0x5f68,
0x54a8,0xb9ad,0x73b8,0x64d6,0x2492,0x3593,0x03e0,
#ifndef blit16_ARRAY_ONLY
},
blit16_WIDTH,
blit16_HEIGHT,
blit16_DESCENDER,
blit16_ADVANCE,
blit16_ROW_ADVANCE,
#endif/*blit16_ARRAY_ONLY*/
};
/* StartX/Y refers to the top left corner of the glyph's bounding box */
int blit16_TextNExplicit(blit_pixel *Buffer, blit_pixel Value, int Scale, int BufWidth, int BufHeight, int Wrap, int StartX, int StartY, int StrLen, char *String)
{
int IsNegative = BufWidth < 0;
int DrawDir = IsNegative ? -1 : 1;
int AbsBufWidth = DrawDir * BufWidth;
unsigned int LinesPrinted = 1;
int i, x, y;
StrLen = StrLen >= 0 ? StrLen : 0x7FFFFFFF; /* if negative, wrap to max int */
for(i = 0, x = StartX, y = StartY; String[i] && i < StrLen; ++i)
{
char c = String[i];
int EndY = y + (blit16_HEIGHT + blit16_DESCENDER) * Scale * DrawDir;
int BufUnderflow = EndY < 0 || y < 0;
int BufOverflow = BufHeight && (EndY >= BufHeight || y >= BufHeight);
int BufYMinExceed = BufUnderflow || (IsNegative && BufOverflow);
int BufYMaxExceed = BufOverflow || (IsNegative && BufUnderflow);
int BufXMinExceed = x < 0;
int EndX = c == '\n' || c == '\r' ? StartX :
c == '\t' ? x + 4 * Scale * blit16_ADVANCE :
c == '\b' ? x - Scale * blit16_WIDTH :
/* normal char */ x + Scale * blit16_WIDTH;
int BufXMaxExceed = EndX > AbsBufWidth;
if(BufYMaxExceed) { break; } /* no point adding extra undrawable lines */
else if((! BufYMinExceed && (! BufXMaxExceed || Wrap)) || c == '\n')
{
if(BufXMaxExceed && c != '\n') { c = '\n'; --i; } /* new line and redo on-screen checks */
else if(BufXMinExceed) { c = ' '; } /* skip past character without drawing */
switch(c)
{
default: /* normal character */
{
unsigned int glY, pxY, glX, pxX;
blit16_glyph Glyph = blit16_Glyphs[blit_IndexFromASCII(c)];
unsigned int OffsetY = y + blit16_EXTRA_BITS(Glyph) * Scale * DrawDir;
blit_pixel *Pixel, *Row = Buffer + OffsetY * AbsBufWidth + x;
for(glY = 0; glY < blit16_HEIGHT; ++glY)
for(pxY = Scale; pxY--; Row += BufWidth)
for(glX = 0, Pixel = Row; glX < blit16_WIDTH; ++glX)
{
unsigned int Shift = glY * blit16_WIDTH + glX;
unsigned int PixelDrawn = (Glyph >> Shift) & 1;
if(PixelDrawn) for(pxX = Scale; pxX--; *Pixel++ = Value);
else { Pixel += Scale; }
}
} /* fallthrough */
case ' ': x += Scale * blit16_ADVANCE; break; /* space: no need to touch pixels */
case '\b': x -= Scale * blit16_ADVANCE; break; /* non-destructive backspace */
case '\t': x += 4 * Scale * blit16_ADVANCE; break; /* tab: add 4 spaces */
case '\n': y += DrawDir * Scale * blit16_ROW_ADVANCE; ++LinesPrinted; /* new line; fallthrough */
case '\r': x = StartX; break; /* carriage return */
}
}
}
return LinesPrinted;
}
#ifndef blit16_NO_HELPERS
#ifndef blit16_MACRO_INLINE
blit_inline int blit16_TextExplicit(blit_pixel *Buffer, blit_pixel Value, int Scale, int BufWidth, int BufHeight, int Wrap, int StartX, int StartY, char *String)
{ return blit16_TextNExplicit(Buffer, Value, Scale, BufWidth, BufHeight, Wrap, StartX, StartY, -1, String); }
blit_inline int blit16_TextNProps(blit_props Props, int StartX, int StartY, int StrLen, char *String)
{ return blit16_TextNExplicit(Props.Buffer, Props.Value, Props.Scale, Props.BufWidth, Props.BufHeight, Props.Wrap, StartX, StartY, StrLen, String); }
blit_inline int blit16_TextProps(blit_props Props, int StartX, int StartY, char *String)
{ return blit16_TextNExplicit(Props.Buffer, Props.Value, Props.Scale, Props.BufWidth, Props.BufHeight, Props.Wrap, StartX, StartY, -1, String); }
blit_inline int blit16_TextN(int StartX, int StartY, int StrLen, char *String)
{ return blit16_TextNExplicit(Blit16.Props.Buffer, Blit16.Props.Value, Blit16.Props.Scale, Blit16.Props.BufWidth, Blit16.Props.BufHeight, Blit16.Props.Wrap, StartX, StartY, StrLen, String); }
blit_inline int blit16_Text(int StartX, int StartY, char *String)
{ return blit16_TextNExplicit(Blit16.Props.Buffer, Blit16.Props.Value, Blit16.Props.Scale, Blit16.Props.BufWidth, Blit16.Props.BufHeight, Blit16.Props.Wrap, StartX, StartY, -1, String); }
#else/*blit16_NO_INLINE*/
#define blit16_TextExplicit(Buffer, Value, Scale, BufWidth, BufHeight, Wrap, StartX, StartY, String) \
blit16_TextNExplicit(Buffer, Value, Scale, BufWidth, BufHeight, Wrap, StartX, StartY, -1, String)
#define blit16_TextNProps(Props, StartX, StartY, StrLen, String) \
blit16_TextNExplicit((Props).Buffer, (Props).Value, (Props).Scale, (Props).BufWidth, (Props).BufHeight, (Props).Wrap, StartX, StartY, StrLen, String)
#define blit16_TextProps(Props, StartX, StartY, String) \
blit16_TextNExplicit((Props).Buffer, (Props).Value, (Props).Scale, (Props).BufWidth, (Props).BufHeight, (Props).Wrap, StartX, StartY, -1, String)
#define blit16_TextN(StartX, StartY, StrLen, String) \
blit16_TextNExplicit(Blit16.Props.Buffer, Blit16.Props.Value, Blit16.Props.Scale, Blit16.Props.BufWidth, Blit16.Props.BufHeight, Blit16.Props.Wrap, StartX, StartY, StrLen, String)
#define blit16_Text(StartX, StartY, String) \
blit16_TextNExplicit(Blit16.Props.Buffer, Blit16.Props.Value, Blit16.Props.Scale, Blit16.Props.BufWidth, Blit16.Props.BufHeight, Blit16.Props.Wrap, StartX, StartY, -1, String)
#endif/*blit16_NO_INLINE*/
#endif/*blit16_NO_HELPERS*/
#define blit16_H
#endif/*blit16_H*/