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package display
import "github.com/veandco/go-sdl2/sdl"
// Bitmap font: 5x7 pixel glyphs for ASCII 32–126, rendered via FillRect.
// Each glyph is 7 rows of 5 bits (MSB = leftmost pixel).
const (
glyphW = 5 // pixels per character width
glyphH = 7 // pixels per character height
charGap = 1 // horizontal gap between characters
)
// font5x7 maps ASCII 32–126 to 7-byte bitmaps (one byte per row, top 5 bits used).
// Index 0 = space (0x20), index 94 = tilde (0x7E).
var font5x7 = [95][7]byte{
// space (0x20)
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
// ! (0x21)
{0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x20},
// " (0x22)
{0x50, 0x50, 0x00, 0x00, 0x00, 0x00, 0x00},
// # (0x23)
{0x50, 0xF8, 0x50, 0x50, 0x50, 0xF8, 0x50},
// $ (0x24)
{0x20, 0x70, 0xA0, 0x70, 0x28, 0x70, 0x20},
// % (0x25)
{0xC8, 0xC8, 0x10, 0x20, 0x40, 0x98, 0x98},
// & (0x26)
{0x40, 0xA0, 0xA0, 0x40, 0xA8, 0x90, 0x68},
// ' (0x27)
{0x20, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00},
// ( (0x28)
{0x10, 0x20, 0x40, 0x40, 0x40, 0x20, 0x10},
// ) (0x29)
{0x40, 0x20, 0x10, 0x10, 0x10, 0x20, 0x40},
// * (0x2A)
{0x00, 0x20, 0xA8, 0x70, 0xA8, 0x20, 0x00},
// + (0x2B)
{0x00, 0x20, 0x20, 0xF8, 0x20, 0x20, 0x00},
// , (0x2C)
{0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x40},
// - (0x2D)
{0x00, 0x00, 0x00, 0xF8, 0x00, 0x00, 0x00},
// . (0x2E)
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20},
// / (0x2F)
{0x08, 0x08, 0x10, 0x20, 0x40, 0x80, 0x80},
// 0 (0x30)
{0x70, 0x88, 0x98, 0xA8, 0xC8, 0x88, 0x70},
// 1 (0x31)
{0x20, 0x60, 0x20, 0x20, 0x20, 0x20, 0x70},
// 2 (0x32)
{0x70, 0x88, 0x08, 0x10, 0x20, 0x40, 0xF8},
// 3 (0x33)
{0x70, 0x88, 0x08, 0x30, 0x08, 0x88, 0x70},
// 4 (0x34)
{0x10, 0x30, 0x50, 0x90, 0xF8, 0x10, 0x10},
// 5 (0x35)
{0xF8, 0x80, 0xF0, 0x08, 0x08, 0x88, 0x70},
// 6 (0x36)
{0x30, 0x40, 0x80, 0xF0, 0x88, 0x88, 0x70},
// 7 (0x37)
{0xF8, 0x08, 0x10, 0x20, 0x40, 0x40, 0x40},
// 8 (0x38)
{0x70, 0x88, 0x88, 0x70, 0x88, 0x88, 0x70},
// 9 (0x39)
{0x70, 0x88, 0x88, 0x78, 0x08, 0x10, 0x60},
// : (0x3A)
{0x00, 0x00, 0x20, 0x00, 0x00, 0x20, 0x00},
// ; (0x3B)
{0x00, 0x00, 0x20, 0x00, 0x00, 0x20, 0x40},
// < (0x3C)
{0x08, 0x10, 0x20, 0x40, 0x20, 0x10, 0x08},
// = (0x3D)
{0x00, 0x00, 0xF8, 0x00, 0xF8, 0x00, 0x00},
// > (0x3E)
{0x80, 0x40, 0x20, 0x10, 0x20, 0x40, 0x80},
// ? (0x3F)
{0x70, 0x88, 0x08, 0x10, 0x20, 0x00, 0x20},
// @ (0x40)
{0x70, 0x88, 0xB8, 0xA8, 0xB8, 0x80, 0x70},
// A (0x41)
{0x70, 0x88, 0x88, 0xF8, 0x88, 0x88, 0x88},
// B (0x42)
{0xF0, 0x88, 0x88, 0xF0, 0x88, 0x88, 0xF0},
// C (0x43)
{0x70, 0x88, 0x80, 0x80, 0x80, 0x88, 0x70},
// D (0x44)
{0xF0, 0x88, 0x88, 0x88, 0x88, 0x88, 0xF0},
// E (0x45)
{0xF8, 0x80, 0x80, 0xF0, 0x80, 0x80, 0xF8},
// F (0x46)
{0xF8, 0x80, 0x80, 0xF0, 0x80, 0x80, 0x80},
// G (0x47)
{0x70, 0x88, 0x80, 0xB8, 0x88, 0x88, 0x70},
// H (0x48)
{0x88, 0x88, 0x88, 0xF8, 0x88, 0x88, 0x88},
// I (0x49)
{0x70, 0x20, 0x20, 0x20, 0x20, 0x20, 0x70},
// J (0x4A)
{0x38, 0x10, 0x10, 0x10, 0x10, 0x90, 0x60},
// K (0x4B)
{0x88, 0x90, 0xA0, 0xC0, 0xA0, 0x90, 0x88},
// L (0x4C)
{0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0xF8},
// M (0x4D)
{0x88, 0xD8, 0xA8, 0xA8, 0x88, 0x88, 0x88},
// N (0x4E)
{0x88, 0xC8, 0xA8, 0x98, 0x88, 0x88, 0x88},
// O (0x4F)
{0x70, 0x88, 0x88, 0x88, 0x88, 0x88, 0x70},
// P (0x50)
{0xF0, 0x88, 0x88, 0xF0, 0x80, 0x80, 0x80},
// Q (0x51)
{0x70, 0x88, 0x88, 0x88, 0xA8, 0x90, 0x68},
// R (0x52)
{0xF0, 0x88, 0x88, 0xF0, 0xA0, 0x90, 0x88},
// S (0x53)
{0x70, 0x88, 0x80, 0x70, 0x08, 0x88, 0x70},
// T (0x54)
{0xF8, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20},
// U (0x55)
{0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x70},
// V (0x56)
{0x88, 0x88, 0x88, 0x88, 0x88, 0x50, 0x20},
// W (0x57)
{0x88, 0x88, 0x88, 0xA8, 0xA8, 0xD8, 0x88},
// X (0x58)
{0x88, 0x88, 0x50, 0x20, 0x50, 0x88, 0x88},
// Y (0x59)
{0x88, 0x88, 0x50, 0x20, 0x20, 0x20, 0x20},
// Z (0x5A)
{0xF8, 0x08, 0x10, 0x20, 0x40, 0x80, 0xF8},
// [ (0x5B)
{0x70, 0x40, 0x40, 0x40, 0x40, 0x40, 0x70},
// \ (0x5C)
{0x80, 0x80, 0x40, 0x20, 0x10, 0x08, 0x08},
// ] (0x5D)
{0x70, 0x10, 0x10, 0x10, 0x10, 0x10, 0x70},
// ^ (0x5E)
{0x20, 0x50, 0x88, 0x00, 0x00, 0x00, 0x00},
// _ (0x5F)
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF8},
// ` (0x60)
{0x40, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00},
// a (0x61)
{0x00, 0x00, 0x70, 0x08, 0x78, 0x88, 0x78},
// b (0x62)
{0x80, 0x80, 0xF0, 0x88, 0x88, 0x88, 0xF0},
// c (0x63)
{0x00, 0x00, 0x70, 0x80, 0x80, 0x80, 0x70},
// d (0x64)
{0x08, 0x08, 0x78, 0x88, 0x88, 0x88, 0x78},
// e (0x65)
{0x00, 0x00, 0x70, 0x88, 0xF8, 0x80, 0x70},
// f (0x66)
{0x30, 0x48, 0x40, 0xE0, 0x40, 0x40, 0x40},
// g (0x67)
{0x00, 0x00, 0x78, 0x88, 0x78, 0x08, 0x70},
// h (0x68)
{0x80, 0x80, 0xF0, 0x88, 0x88, 0x88, 0x88},
// i (0x69)
{0x20, 0x00, 0x60, 0x20, 0x20, 0x20, 0x70},
// j (0x6A)
{0x10, 0x00, 0x30, 0x10, 0x10, 0x90, 0x60},
// k (0x6B)
{0x80, 0x80, 0x90, 0xA0, 0xC0, 0xA0, 0x90},
// l (0x6C)
{0x60, 0x20, 0x20, 0x20, 0x20, 0x20, 0x70},
// m (0x6D)
{0x00, 0x00, 0xD0, 0xA8, 0xA8, 0xA8, 0xA8},
// n (0x6E)
{0x00, 0x00, 0xF0, 0x88, 0x88, 0x88, 0x88},
// o (0x6F)
{0x00, 0x00, 0x70, 0x88, 0x88, 0x88, 0x70},
// p (0x70)
{0x00, 0x00, 0xF0, 0x88, 0xF0, 0x80, 0x80},
// q (0x71)
{0x00, 0x00, 0x78, 0x88, 0x78, 0x08, 0x08},
// r (0x72)
{0x00, 0x00, 0xB0, 0xC8, 0x80, 0x80, 0x80},
// s (0x73)
{0x00, 0x00, 0x78, 0x80, 0x70, 0x08, 0xF0},
// t (0x74)
{0x40, 0x40, 0xE0, 0x40, 0x40, 0x48, 0x30},
// u (0x75)
{0x00, 0x00, 0x88, 0x88, 0x88, 0x88, 0x78},
// v (0x76)
{0x00, 0x00, 0x88, 0x88, 0x88, 0x50, 0x20},
// w (0x77)
{0x00, 0x00, 0x88, 0x88, 0xA8, 0xA8, 0x50},
// x (0x78)
{0x00, 0x00, 0x88, 0x50, 0x20, 0x50, 0x88},
// y (0x79)
{0x00, 0x00, 0x88, 0x88, 0x78, 0x08, 0x70},
// z (0x7A)
{0x00, 0x00, 0xF8, 0x10, 0x20, 0x40, 0xF8},
// { (0x7B)
{0x10, 0x20, 0x20, 0x40, 0x20, 0x20, 0x10},
// | (0x7C)
{0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20},
// } (0x7D)
{0x40, 0x20, 0x20, 0x10, 0x20, 0x20, 0x40},
// ~ (0x7E)
{0x00, 0x00, 0x40, 0xA8, 0x10, 0x00, 0x00},
}
// drawChar renders a single ASCII character at (x, y) using filled rectangles.
// Each pixel of the 5x7 glyph is drawn as a scale×scale block.
func drawChar(renderer *sdl.Renderer, ch byte, x, y, scale int32) {
if ch < 0x20 || ch > 0x7E {
ch = '?' // replace unprintable characters
}
glyph := font5x7[ch-0x20]
for row := 0; row < glyphH; row++ {
bits := glyph[row]
for col := 0; col < glyphW; col++ {
if bits&(0x80>>uint(col)) != 0 {
renderer.FillRect(&sdl.Rect{
X: x + int32(col)*scale,
Y: y + int32(row)*scale,
W: scale,
H: scale,
})
}
}
}
}
// drawString renders a string at (x, y) with the given pixel scale.
// Returns the total width in pixels consumed by the string.
func drawString(renderer *sdl.Renderer, s string, x, y, scale int32) int32 {
cx := x
for i := 0; i < len(s); i++ {
drawChar(renderer, s[i], cx, y, scale)
cx += (glyphW + charGap) * scale
}
return cx - x
}
// stringWidth returns the pixel width of a string at the given scale.
func stringWidth(s string, scale int32) int32 {
if len(s) == 0 {
return 0
}
return int32(len(s))*(glyphW+charGap)*scale - charGap*scale
}
|
