cloud-game/ui/font.go

package ui

import (
	"bytes"
	"image"
	"image/color"
	"image/draw"
	"image/png"
	"log"
	"strings"
)

var fontMask image.Image

func init() {
	im, err := png.Decode(bytes.NewBuffer(fontData))
	if err != nil {
		log.Fatalln(err)
	}
	size := im.Bounds().Size()
	mask := image.NewRGBA(im.Bounds())
	for y := 0; y < size.Y; y++ {
		for x := 0; x < size.X; x++ {
			r, _, _, _ := im.At(x, y).RGBA()
			if r > 0 {
				mask.Set(x, y, color.Opaque)
			}
		}
	}
	fontMask = mask
}

func CreateGenericThumbnail(text string) image.Image {
	im := image.NewRGBA(image.Rect(0, 0, 256, 240))
	draw.Draw(im, im.Rect, &image.Uniform{color.Black}, image.ZP, draw.Src)
	DrawCenteredText(im, text, 1, 2, color.RGBA{128, 128, 128, 255})
	DrawCenteredText(im, text, 0, 0, color.White)
	return im
}

func WordWrap(text string, maxLength int) []string {
	var rows []string
	words := strings.Fields(text)
	if len(words) == 0 {
		return rows
	}
	row := words[0]
	for _, word := range words[1:] {
		newRow := row + " " + word
		if len(newRow) <= maxLength {
			row = newRow
		} else {
			rows = append(rows, row)
			row = word
		}
	}
	rows = append(rows, row)
	return rows
}

func DrawCenteredText(dst draw.Image, text string, dx, dy int, c color.Color) {
	rows := WordWrap(text, 15)
	for i, row := range rows {
		x := 128 - len(row)*8
		y := 120 - len(rows)*12 + i*24
		DrawText(dst, x+dx, y+dy, row, c)
	}
}

func DrawCharacter(dst draw.Image, x, y int, ch byte, c color.Color) {
	if ch < 32 || ch > 128 {
		return
	}
	cx := int((ch-32)%16) * 16
	cy := int((ch-32)/16) * 16
	r := image.Rect(x, y, x+16, y+16)
	src := &image.Uniform{c}
	sp := image.Pt(cx, cy)
	draw.DrawMask(dst, r, src, sp, fontMask, sp, draw.Over)
}

func DrawText(dst draw.Image, x, y int, text string, c color.Color) {
	for i := range text {
		DrawCharacter(dst, x, y, text[i], c)
		x += 16
	}
}

var fontData = []byte{
	0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, 0x00, 0x00, 0x00, 0x0D,
	0x49, 0x48, 0x44, 0x52, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x60,
	0x02, 0x03, 0x00, 0x00, 0x00, 0x8F, 0x9F, 0x44, 0x1B, 0x00, 0x00, 0x00,
	0x06, 0x50, 0x4C, 0x54, 0x45, 0x00, 0x00, 0x01, 0xFF, 0xFF, 0xFE, 0x6A,
	0x62, 0xC8, 0x2E, 0x00, 0x00, 0x00, 0x01, 0x62, 0x4B, 0x47, 0x44, 0x00,
	0x88, 0x05, 0x1D, 0x48, 0x00, 0x00, 0x00, 0x09, 0x70, 0x48, 0x59, 0x73,
	0x00, 0x00, 0x0E, 0xC4, 0x00, 0x00, 0x0E, 0xC4, 0x01, 0x95, 0x2B, 0x0E,
	0x1B, 0x00, 0x00, 0x02, 0xD2, 0x49, 0x44, 0x41, 0x54, 0x78, 0xDA, 0xC5,
	0x98, 0x49, 0x62, 0x23, 0x21, 0x0C, 0x45, 0xB5, 0xE1, 0x7E, 0xDA, 0xFC,
	0xFB, 0x5F, 0xA5, 0x4B, 0xE8, 0x4B, 0x88, 0x72, 0x2A, 0x1D, 0x07, 0xB9,
	0x9B, 0xC4, 0x2E, 0x8C, 0xE1, 0x19, 0x8D, 0x0C, 0x22, 0x56, 0x86, 0x5E,
	0xFF, 0x98, 0x2F, 0x81, 0x78, 0x81, 0xB5, 0xC5, 0x77, 0xF2, 0x50, 0xE2,
	0x9B, 0x63, 0x00, 0x90, 0x80, 0x71, 0xD5, 0xAD, 0xE6, 0x9F, 0xC5, 0x81,
	0x90, 0xD9, 0x92, 0xF0, 0x2C, 0xF9, 0x6B, 0x4D, 0x00, 0x00, 0xEA, 0xFD,
	0x31, 0x45, 0x40, 0x4C, 0xD2, 0xDE, 0x50, 0xC4, 0xBB, 0x4B, 0xD0, 0x02,
	0xF0, 0xCF, 0x26, 0x82, 0xBA, 0xE2, 0xE0, 0xDF, 0x06, 0x00, 0x5E, 0xD8,
	0x1D, 0xBB, 0x04, 0xE7, 0x00, 0x4E, 0xC5, 0x44, 0x98, 0xAD, 0xF6, 0x3F,
	0x20, 0xF2, 0x17, 0x11, 0x96, 0x79, 0xBB, 0x00, 0xAE, 0x48, 0xA5, 0x11,
	0xCB, 0x34, 0xAB, 0x19, 0xB1, 0x2C, 0x08, 0x69, 0x03, 0x24, 0x87, 0xD3,
	0xB7, 0xEE, 0x48, 0xEA, 0xEE, 0xCA, 0x05, 0xA0, 0x7D, 0x80, 0xE7, 0x68,
	0x79, 0x0C, 0x9F, 0x9F, 0xB4, 0xFE, 0x10, 0x90, 0x8E, 0x33, 0x03, 0xC9,
	0x2A, 0xEE, 0x28, 0x70, 0xD7, 0x66, 0xBB, 0xBC, 0x2A, 0x5C, 0xDC, 0xE9,
	0x8E, 0x01, 0x23, 0x03, 0x67, 0xD0, 0x89, 0x90, 0x41, 0x54, 0x82, 0x7C,
	0x99, 0x70, 0x33, 0x23, 0x1A, 0x00, 0x48, 0x3B, 0x79, 0x0E, 0x63, 0x58,
	0xB3, 0x1F, 0xE4, 0x0E, 0x70, 0xAF, 0x66, 0xA5, 0x17, 0x10, 0x8A, 0xA3,
	0x00, 0xD1, 0x29, 0x95, 0x7B, 0xF3, 0xA3, 0x45, 0xEB, 0x02, 0xB8, 0x4D,
	0xE7, 0x40, 0x95, 0x32, 0x6D, 0x57, 0xEE, 0x4B, 0xE0, 0xC6, 0xE0, 0x06,
	0xC0, 0x15, 0x36, 0x9E, 0xB2, 0x62, 0x36, 0x37, 0xC5, 0x2D, 0xF3, 0x2E,
	0x33, 0xA2, 0x26, 0x97, 0x63, 0xC0, 0xB4, 0x9E, 0xA5, 0x73, 0xBA, 0xED,
	0x1C, 0x12, 0xEE, 0x6B, 0x7A, 0x02, 0x13, 0x6D, 0x00, 0x8A, 0x2B, 0x3B,
	0xE4, 0x18, 0xF0, 0x46, 0x79, 0x23, 0xEA, 0xDF, 0x00, 0xF8, 0x54, 0xB5,
	0x84, 0xB0, 0xFA, 0x12, 0xE7, 0x15, 0xF5, 0xF4, 0x36, 0xE5, 0xF4, 0x7A,
	0x09, 0xB2, 0x39, 0xF6, 0x18, 0x80, 0x4C, 0xE2, 0xF6, 0xF4, 0x5A, 0xD5,
	0xD7, 0x0A, 0xB6, 0xE8, 0x65, 0xBF, 0x67, 0x7F, 0x69, 0xEA, 0x53, 0x00,
	0xA7, 0xC6, 0x0D, 0x8E, 0xAC, 0xE7, 0xEE, 0xEA, 0x13, 0x90, 0x71, 0x67,
	0x22, 0xB6, 0x03, 0x80, 0x1C, 0x00, 0x44, 0x52, 0xA1, 0x32, 0x03, 0xB0,
	0x12, 0x8A, 0x82, 0x0A, 0x6E, 0x02, 0x00, 0x0F, 0x22, 0x70, 0x9A, 0x54,
	0x76, 0xB0, 0x30, 0x4C, 0x9C, 0x36, 0x40, 0xE9, 0xF8, 0x6A, 0xC6, 0x1B,
	0x60, 0xA0, 0xA4, 0xFB, 0x2E, 0xC0, 0x80, 0xA6, 0xE2, 0x36, 0x57, 0xF6,
	0x3D, 0x4F, 0xBA, 0xF2, 0xA0, 0x52, 0x07, 0x96, 0xD9, 0x19, 0x0B, 0x87,
	0x80, 0xFF, 0x5F, 0xC0, 0xF4, 0x05, 0xA6, 0xAE, 0x3A, 0xC5, 0x4D, 0xB9,
	0x53, 0x0C, 0x6E, 0x7F, 0x7D, 0x59, 0xEF, 0x02, 0x6C, 0x9D, 0xDD, 0x57,
	0xB7, 0xB6, 0x19, 0xB8, 0x1E, 0xC4, 0xB9, 0xC4, 0xF8, 0xC7, 0x8F, 0x00,
	0x64, 0x07, 0x0C, 0x37, 0xD5, 0x04, 0x8C, 0x72, 0x00, 0xE1, 0x36, 0xA0,
	0x1B, 0xC0, 0x85, 0x25, 0x00, 0x1A, 0x89, 0x35, 0x96, 0xFE, 0x75, 0x08,
	0x8B, 0x3E, 0x4D, 0x00, 0x33, 0xE1, 0x0C, 0xE9, 0x75, 0xC6, 0x0B, 0x37,
	0xCD, 0xE5, 0xCE, 0x25, 0xE0, 0x10, 0xEC, 0x2B, 0xCC, 0x39, 0x80, 0x5B,
	0x29, 0x0B, 0xD5, 0x1A, 0xBA, 0x73, 0xB1, 0x71, 0x41, 0x34, 0x96, 0xFF,
	0x3C, 0x04, 0xB5, 0x03, 0x2E, 0x09, 0x36, 0x25, 0xFA, 0xF3, 0x96, 0xD2,
	0xE8, 0xCA, 0x57, 0x89, 0x67, 0x13, 0xE0, 0x30, 0x92, 0xD1, 0x00, 0xC0,
	0xC3, 0x11, 0x8E, 0xD1, 0x52, 0xF5, 0x95, 0x8E, 0xF4, 0xD5, 0x01, 0xBC,
	0x1F, 0x50, 0x1F, 0x7C, 0xFB, 0x10, 0x80, 0x1B, 0x6D, 0xDF, 0xAE, 0xF8,
	0xB6, 0x46, 0xD6, 0x2A, 0xAA, 0x37, 0x11, 0x34, 0x0E, 0xE6, 0xEC, 0xDF,
	0x01, 0xE0, 0xE4, 0x06, 0x13, 0x57, 0xD6, 0x81, 0x78, 0x16, 0x11, 0x06,
	0x3D, 0xD9, 0xF6, 0x1A, 0x31, 0xE2, 0x23, 0x00, 0xC4, 0xF1, 0x87, 0xAD,
	0x09, 0xD0, 0x7F, 0x05, 0x58, 0x97, 0x0E, 0x3B, 0x20, 0x82, 0xAD, 0x1D,
	0x60, 0x99, 0xE3, 0x66, 0xC6, 0x32, 0xED, 0xF1, 0x22, 0x4E, 0x00, 0xD2,
	0x8C, 0xE7, 0x80, 0xE7, 0x78, 0xFD, 0xBA, 0xFE, 0x46, 0xC0, 0xFF, 0x02,
	0xF0, 0x5D, 0x3F, 0xE6, 0xF6, 0x99, 0x60, 0xF1, 0x74, 0x7E, 0xF9, 0x28,
	0x60, 0x9D, 0x01, 0xFC, 0xA2, 0x6A, 0x74, 0x00, 0xC2, 0x7C, 0xB6, 0x9C,
	0x4A, 0x6C, 0x75, 0x96, 0x63, 0xC1, 0x5F, 0x74, 0xEF, 0x02, 0x58, 0xF7,
	0x2F, 0xC7, 0x80, 0x0C, 0x5F, 0x8A, 0x84, 0xEA, 0xDA, 0xB6, 0xDE, 0x84,
	0xCB, 0x22, 0x77, 0x35, 0x32, 0xD6, 0xF5, 0x61, 0x23, 0x40, 0x25, 0xAF,
	0xFC, 0x36, 0x80, 0x75, 0x56, 0xD4, 0xE3, 0xBE, 0x48, 0xD9, 0xDD, 0x34,
	0x00, 0x52, 0x89, 0xB9, 0xC3, 0xF2, 0x04, 0x7E, 0xA5, 0xAF, 0x10, 0xA1,
	0xDC, 0x56, 0x7C, 0x02, 0xA0, 0x92, 0x8B, 0x06, 0xF7, 0xFF, 0xB2, 0xD2,
	0x3A, 0xAF, 0x21, 0xFD, 0x88, 0xAC, 0xD5, 0x95, 0xF3, 0x0A, 0xB5, 0x0D,
	0xF0, 0xEB, 0x7B, 0x83, 0x53, 0xC0, 0x1F, 0xEF, 0x0D, 0xA2, 0x4D, 0x77,
	0x69, 0xB8, 0xB7, 0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4E, 0x44, 0xAE,
	0x42, 0x60, 0x82,
}