SVGA自定义文字如何适配RTL

正常我们是直接通过设置这块来根据设计师提供的key往里头塞文字的,这块区域也是设计师设置的

SVGADynamicEntity().setDynamicText(
                        new StaticLayout(
                                text,
                                0,
                                text.length(),
                                textPaint,
                                0,
                                alignment,
                                0.0f,
                                0.0f,
                                false
                        ),
                        "text"
                )

 然后我们想要它适配RTL的时候,我当时第一想法是,那不是直接控件X轴改变方向不就完了嘛

    SVGAImageView svg = new SVGAImageView(context);
        svg.setScaleX(-1);

额,但是实际情况你会发现它内部的文字它也是倒过来的,嗯,倒过来的,通过查看源码,我们发现其实它这块设置的文字最终是会给你转个TextBitmap进行遍历绘制的

SVGA自定义文字如何适配RTL_第1张图片

 

  override fun drawFrame(canvas: Canvas, frameIndex: Int, scaleType: ImageView.ScaleType) {
        super.drawFrame(canvas, frameIndex, scaleType)
     ...
        sprites.forEachIndexed { index, svgaDrawerSprite ->

            // Save matte sprite
            svgaDrawerSprite.imageKey?.let {
                /// No matte layer included or VERSION Unsopport matte
                if (!hasMatteLayer || Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
                    // Normal sprite
                    drawSprite(svgaDrawerSprite, canvas, frameIndex)
                    // Continue
                    return@forEachIndexed
                }
              
            }
           ...
        releaseFrameSprites(sprites)
    }

这块drawSprite就是根据imageKey,也就是设计师给我们准备的填充区域对应的key,对这块进行轮询绘制

    private fun drawSprite(sprite: SVGADrawerSprite, canvas: Canvas, frameIndex: Int) {
        drawImage(sprite, canvas)
        drawShape(sprite, canvas)
        drawDynamic(sprite, canvas, frameIndex)
    }

其中的文字绘制就是那个drawImage嗯,就是它本质上就是给你绘制成bitmap了

    private fun drawImage(sprite: SVGADrawerSprite, canvas: Canvas) {
        val imageKey = sprite.imageKey ?: return
        val isHidden = dynamicItem.dynamicHidden[imageKey] == true
        if (isHidden) {
            return
        }
        val bitmapKey = if (imageKey.endsWith(".matte")) imageKey.substring(0, imageKey.length - 6) else imageKey
        val drawingBitmap = (dynamicItem.dynamicImage[bitmapKey] ?: videoItem.imageMap[bitmapKey])
                ?: return
        val frameMatrix = shareFrameMatrix(sprite.frameEntity.transform)
        val paint = this.sharedValues.sharedPaint()
        paint.isAntiAlias = videoItem.antiAlias
        paint.isFilterBitmap = videoItem.antiAlias
        paint.alpha = (sprite.frameEntity.alpha * 255).toInt()
        if (sprite.frameEntity.maskPath != null) {
            val maskPath = sprite.frameEntity.maskPath ?: return
            canvas.save()
            val path = this.sharedValues.sharedPath()
            maskPath.buildPath(path)
            path.transform(frameMatrix)
            canvas.clipPath(path)
            frameMatrix.preScale((sprite.frameEntity.layout.width / drawingBitmap.width).toFloat(), (sprite.frameEntity.layout.height / drawingBitmap.height).toFloat())
            if (!drawingBitmap.isRecycled) {
                canvas.drawBitmap(drawingBitmap, frameMatrix, paint)
            }
            canvas.restore()
        } else {
            frameMatrix.preScale((sprite.frameEntity.layout.width / drawingBitmap.width).toFloat(), (sprite.frameEntity.layout.height / drawingBitmap.height).toFloat())
            if (!drawingBitmap.isRecycled) {
                canvas.drawBitmap(drawingBitmap, frameMatrix, paint)
            }
        }
        dynamicItem.dynamicIClickArea.let {
            it.get(imageKey)?.let { listener ->
                val matrixArray = floatArrayOf(0f, 0f, 0f, 0f, 0f, 0f, 0f, 0f, 0f)
                frameMatrix.getValues(matrixArray)
                listener.onResponseArea(imageKey, matrixArray[2].toInt()
                        , matrixArray[5].toInt()
                        , (drawingBitmap.width * matrixArray[0] + matrixArray[2]).toInt()
                        , (drawingBitmap.height * matrixArray[4] + matrixArray[5]).toInt())
            }
        }
        drawTextOnBitmap(canvas, drawingBitmap, sprite, frameMatrix)
    }

drawTextOnBitmap,重点关注这个,然后我们发现它最终会生成一个

 private fun drawTextOnBitmap(canvas: Canvas, drawingBitmap: Bitmap, sprite: SVGADrawerSprite, frameMatrix: Matrix) {
        if (dynamicItem.isTextDirty) {
            this.drawTextCache.clear()
            dynamicItem.isTextDirty = false
        }
        val imageKey = sprite.imageKey ?: return
        var textBitmap: Bitmap? = null
        dynamicItem.dynamicText[imageKey]?.let { drawingText ->
            dynamicItem.dynamicTextPaint[imageKey]?.let { drawingTextPaint ->
                drawTextCache[imageKey]?.let {
                    textBitmap = it
                } ?: kotlin.run {
                    textBitmap = Bitmap.createBitmap(drawingBitmap.width, drawingBitmap.height, Bitmap.Config.ARGB_8888)
                    val drawRect = Rect(0, 0, drawingBitmap.width, drawingBitmap.height)
                    val textCanvas = Canvas(textBitmap)
                    drawingTextPaint.isAntiAlias = true
                    val fontMetrics = drawingTextPaint.getFontMetrics();
                    val top = fontMetrics.top
                    val bottom = fontMetrics.bottom
                    val baseLineY = drawRect.centerY() - top / 2 - bottom / 2
                    textCanvas.drawText(drawingText, drawRect.centerX().toFloat(), baseLineY, drawingTextPaint);
                    drawTextCache.put(imageKey, textBitmap as Bitmap)
                }
            }
        }

        dynamicItem.dynamicBoringLayoutText[imageKey]?.let {
            drawTextCache[imageKey]?.let {
                textBitmap = it
            } ?: kotlin.run {
                it.paint.isAntiAlias = true

                textBitmap = Bitmap.createBitmap(drawingBitmap.width, drawingBitmap.height, Bitmap.Config.ARGB_8888)
                val textCanvas = Canvas(textBitmap)
                textCanvas.translate(0f, ((drawingBitmap.height - it.height) / 2).toFloat())
                it.draw(textCanvas)
                drawTextCache.put(imageKey, textBitmap as Bitmap)
            }
        }

        dynamicItem.dynamicStaticLayoutText[imageKey]?.let {
            drawTextCache[imageKey]?.let {
                textBitmap = it
            } ?: kotlin.run {
                it.paint.isAntiAlias = true
                var layout = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                    var lineMax = try {
                        val field = StaticLayout::class.java.getDeclaredField("mMaximumVisibleLineCount")
                        field.isAccessible = true
                        field.getInt(it)
                    } catch (e: Exception) {
                        Int.MAX_VALUE
                    }
                    StaticLayout.Builder
                            .obtain(it.text, 0, it.text.length, it.paint, drawingBitmap.width)
                            .setAlignment(it.alignment)
                            .setMaxLines(lineMax)
                            .setEllipsize(TextUtils.TruncateAt.END)
                            .build()
                } else {
                    StaticLayout(it.text, 0, it.text.length, it.paint, drawingBitmap.width, it.alignment, it.spacingMultiplier, it.spacingAdd, false)
                }
                textBitmap = Bitmap.createBitmap(drawingBitmap.width, drawingBitmap.height, Bitmap.Config.ARGB_8888)
                val textCanvas = Canvas(textBitmap)
                textCanvas.translate(0f, ((drawingBitmap.height - layout.height) / 2).toFloat())
                layout.draw(textCanvas)
                drawTextCache.put(imageKey, textBitmap as Bitmap)
            }
        }
        textBitmap?.let { textBitmap ->
            val paint = this.sharedValues.sharedPaint()
            paint.isAntiAlias = videoItem.antiAlias
            paint.alpha = (sprite.frameEntity.alpha * 255).toInt()
            if (sprite.frameEntity.maskPath != null) {
                val maskPath = sprite.frameEntity.maskPath ?: return@let
                canvas.save()
                canvas.concat(frameMatrix)
                canvas.clipRect(0, 0, drawingBitmap.width, drawingBitmap.height)
                val bitmapShader = BitmapShader(textBitmap, Shader.TileMode.REPEAT, Shader.TileMode.REPEAT)
                paint.shader = bitmapShader
                val path = this.sharedValues.sharedPath()
                maskPath.buildPath(path)
                canvas.drawPath(path, paint)
                canvas.restore()
            } else {
                paint.isFilterBitmap = videoItem.antiAlias

                val w = textBitmap.width
                val h = textBitmap.height
                val matrix = Matrix()
                matrix.postScale(-1f, 1f) // 水平镜像翻转
                val b= Bitmap.createBitmap(textBitmap, 0, 0, w, h, matrix, true)
                canvas.drawBitmap(b, frameMatrix, paint)
            }
        }
    }
textBitmap,然后我们对这个bitmap进行再次翻转就好了,翻转代码已经写里头了,嗯,就这吧--!代码解释的可能不太好,但是总归是功能是实现了--!

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