moving text.ts from diplsay-shield to user-interface-base

Author: KierPalin

text.ts

@@ -0,0 +1,308 @@
+namespace bitmaps {
+
+    export interface Font {
+        charWidth: number;
+        charHeight: number;
+        data: Buffer;
+        multiplier?: number;
+    }
+
+    //% whenUsed
+    export const font8: Font = {
+        charWidth: 6,
+        charHeight: 8,
+        data: hex`
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+`,
+
+    }
+
+    // A unicode 12x12 pixel font based on https://github.com/adobe-fonts/source-han-sans
+    //% whenUsed jres
+    export const font12: Font = {
+        charWidth: 12,
+        charHeight: 12,
+        data: hex``
+    }
+
+    export function getFontForText(text: string) {
+        for (let i = 0; i < text.length; ++i) {
+            // this is quite approximate
+            if (text.charCodeAt(i) > 0x2000)
+                return bitmaps.font12
+        }
+        return bitmaps.font8
+    }
+
+    //% deprecated=1 hidden=1
+    export function doubledFont(f: Font): Font {
+        return scaledFont(f, 2)
+    }
+
+    export function scaledFont(f: Font, size: number): Font {
+        size |= 0
+        if (size < 2)
+            return f
+        return {
+            charWidth: f.charWidth * size,
+            charHeight: f.charHeight * size,
+            data: f.data,
+            multiplier: f.multiplier ? size * f.multiplier : size
+        }
+    }
+
+    //% whenUsed
+    export const font5: Font = {
+        charWidth: 6,
+        charHeight: 5,
+        // source https://github.com/lancaster-university/microbit-dal/blob/master/source/core/MicroBitFont.cpp
+        data: hex`
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+5b0110140b030000 7901121a17130000 7a01121a17130000 7b01121b17120000 7c01121b17120000`,
+    }
+}
+
+namespace texteffects {
+    export interface TextEffectState {
+        xOffset: number;
+        yOffset: number;
+    }
+}
+
+interface Bitmap {
+    //% helper=imagePrint
+    print(text: string, x: number, y: number, color?: number, font?: bitmaps.Font, offsets?: texteffects.TextEffectState[]): void;
+
+    //% helper=imagePrintCenter
+    printCenter(text: string, y: number, color?: number, font?: bitmaps.Font): void;
+}
+
+namespace helpers {
+    export function imagePrintCenter(img: Bitmap, text: string, y: number, color?: number, font?: bitmaps.Font) {
+        if (!font) font = bitmaps.getFontForText(text)
+        let w = text.length * font.charWidth
+        let x = (img.width - w) / 2
+        imagePrint(img, text, x, y, color, font)
+    }
+
+    export function imagePrint(img: Bitmap, text: string, x: number, y: number, color?: number, font?: bitmaps.Font, offsets?: texteffects.TextEffectState[]) {
+        x |= 0
+        y |= 0
+        if (!font)
+            font = bitmaps.getFontForText(text)
+        if (!color) color = 1
+        let x0 = x
+        let cp = 0
+        let mult = font.multiplier ? font.multiplier : 1
+        let dataW = Math.idiv(font.charWidth, mult)
+        let dataH = Math.idiv(font.charHeight, mult)
+        let byteHeight = (dataH + 7) >> 3
+        let charSize = byteHeight * dataW
+        let dataSize = 2 + charSize
+        let fontdata = font.data
+        let lastchar = Math.idiv(fontdata.length, dataSize) - 1
+        let imgBuf: Buffer
+        if (mult == 1) {
+            imgBuf = control.createBuffer(8 + charSize)
+            imgBuf[0] = 0x87
+            imgBuf[1] = 1
+            imgBuf[2] = dataW
+            imgBuf[4] = dataH
+        }
+        while (cp < text.length) {
+            let xOffset = 0, yOffset = 0;
+            if (offsets && cp < offsets.length) {
+                xOffset = offsets[cp].xOffset
+                yOffset = offsets[cp].yOffset
+            }
+
+            let ch = text.charCodeAt(cp++)
+            if (ch == 10) {
+                y += font.charHeight + 2
+                x = x0
+            }
+
+            if (ch < 32)
+                continue // skip control chars
+
+            let l = 0
+            let r = lastchar
+            let off = 0 // this should be a space (0x0020)
+            let guess = (ch - 32) * dataSize
+            if (fontdata.getNumber(NumberFormat.UInt16LE, guess) == ch)
+                off = guess
+            else {
+                while (l <= r) {
+                    let m = l + ((r - l) >> 1);
+                    let v = fontdata.getNumber(NumberFormat.UInt16LE, m * dataSize)
+                    if (v == ch) {
+                        off = m * dataSize
+                        break
+                    }
+                    if (v < ch)
+                        l = m + 1
+                    else
+                        r = m - 1
+                }
+            }
+
+            if (mult == 1) {
+                imgBuf.write(8, fontdata.slice(off + 2, charSize))
+                img.drawIcon(imgBuf, x + xOffset, y + yOffset, color)
+                x += font.charWidth
+            } else {
+                off += 2
+                for (let i = 0; i < dataW; ++i) {
+                    let j = 0
+                    let mask = 0x01
+                    let c = fontdata[off++]
+                    while (j < dataH) {
+                        if (mask == 0x100) {
+                            c = fontdata[off++]
+                            mask = 0x01
+                        }
+                        let n = 0
+                        while (c & mask) {
+                            n++
+                            mask <<= 1
+                        }
+                        if (n) {
+                            img.fillRect(x + xOffset * mult, y + (j + yOffset) * mult, mult, mult * n, color)
+                            j += n
+                        } else {
+                            mask <<= 1
+                            j++
+                        }
+                    }
+                    x += mult
+                }
+            }
+        }
+    }
+}