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1 lines
33 KiB
1 lines
33 KiB
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JavaScript Image Resizer (c) 2012 - Grant Galitz\n// Released to public domain 29 July 2013: https://github.com/grantgalitz/JS-Image-Resizer/issues/4\n\nfunction Resize(\n widthOriginal,\n heightOriginal,\n targetWidth,\n targetHeight,\n blendAlpha,\n interpolationPass,\n resizeCallback\n) {\n this.widthOriginal = Math.abs(Math.floor(widthOriginal) || 0);\n this.heightOriginal = Math.abs(Math.floor(heightOriginal) || 0);\n this.targetWidth = Math.abs(Math.floor(targetWidth) || 0);\n this.targetHeight = Math.abs(Math.floor(targetHeight) || 0);\n this.colorChannels = blendAlpha ? 4 : 3;\n this.interpolationPass = Boolean(interpolationPass);\n this.resizeCallback =\n typeof resizeCallback === 'function' ? resizeCallback : function() {};\n\n this.targetWidthMultipliedByChannels = this.targetWidth * this.colorChannels;\n this.originalWidthMultipliedByChannels =\n this.widthOriginal * this.colorChannels;\n this.originalHeightMultipliedByChannels =\n this.heightOriginal * this.colorChannels;\n this.widthPassResultSize =\n this.targetWidthMultipliedByChannels * this.heightOriginal;\n this.finalResultSize =\n this.targetWidthMultipliedByChannels * this.targetHeight;\n this.initialize();\n}\n\nResize.prototype.initialize = function() {\n // Perform some checks:\n if (\n this.widthOriginal > 0 &&\n this.heightOriginal > 0 &&\n this.targetWidth > 0 &&\n this.targetHeight > 0\n ) {\n this.configurePasses();\n } else {\n throw new Error('Invalid settings specified for the resizer.');\n }\n};\n\nResize.prototype.configurePasses = function() {\n if (this.widthOriginal === this.targetWidth) {\n // Bypass the width resizer pass:\n this.resizeWidth = this.bypassResizer;\n } else {\n // Setup the width resizer pass:\n this.ratioWeightWidthPass = this.widthOriginal / this.targetWidth;\n if (this.ratioWeightWidthPass < 1 && this.interpolationPass) {\n this.initializeFirstPassBuffers(true);\n this.resizeWidth =\n this.colorChannels === 4\n ? this.resizeWidthInterpolatedRGBA\n : this.resizeWidthInterpolatedRGB;\n } else {\n this.initializeFirstPassBuffers(false);\n this.resizeWidth =\n this.colorChannels === 4 ? this.resizeWidthRGBA : this.resizeWidthRGB;\n }\n }\n\n if (this.heightOriginal === this.targetHeight) {\n // Bypass the height resizer pass:\n this.resizeHeight = this.bypassResizer;\n } else {\n // Setup the height resizer pass:\n this.ratioWeightHeightPass = this.heightOriginal / this.targetHeight;\n if (this.ratioWeightHeightPass < 1 && this.interpolationPass) {\n this.initializeSecondPassBuffers(true);\n this.resizeHeight = this.resizeHeightInterpolated;\n } else {\n this.initializeSecondPassBuffers(false);\n this.resizeHeight =\n this.colorChannels === 4 ? this.resizeHeightRGBA : this.resizeHeightRGB;\n }\n }\n};\n\nResize.prototype._resizeWidthInterpolatedRGBChannels = function(\n buffer,\n fourthChannel\n) {\n const channelsNum = fourthChannel ? 4 : 3;\n const ratioWeight = this.ratioWeightWidthPass;\n const 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this.widthOriginal - 1;\n weight < interpolationWidthSourceReadStop;\n targetPosition += channelsNum, weight += ratioWeight\n ) {\n // Calculate weightings:\n secondWeight = weight % 1;\n firstWeight = 1 - secondWeight;\n // Interpolate:\n for (\n finalOffset = targetPosition,\n pixelOffset = Math.floor(weight) * channelsNum;\n finalOffset < this.widthPassResultSize;\n pixelOffset += this.originalWidthMultipliedByChannels,\n finalOffset += this.targetWidthMultipliedByChannels\n ) {\n outputBuffer[finalOffset + 0] =\n buffer[pixelOffset + 0] * firstWeight +\n buffer[pixelOffset + channelsNum + 0] * secondWeight;\n outputBuffer[finalOffset + 1] =\n buffer[pixelOffset + 1] * firstWeight +\n buffer[pixelOffset + channelsNum + 1] * secondWeight;\n outputBuffer[finalOffset + 2] =\n buffer[pixelOffset + 2] * firstWeight +\n buffer[pixelOffset + channelsNum + 2] * secondWeight;\n if (fourthChannel)\n outputBuffer[finalOffset + 3] =\n buffer[pixelOffset + 3] * firstWeight +\n buffer[pixelOffset 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currentPosition;\n multiplier = Math.min(weight, amountToNext);\n for (\n line = 0, pixelOffset = actualPosition;\n line < this.originalHeightMultipliedByChannels;\n pixelOffset += nextLineOffsetOriginalWidth\n ) {\n r = buffer[pixelOffset];\n g = buffer[++pixelOffset];\n b = buffer[++pixelOffset];\n a = fourthChannel ? buffer[++pixelOffset] : 255;\n // Ignore RGB values if pixel is completely transparent\n output[line++] += (a ? r : 0) * multiplier;\n output[line++] += (a ? g : 0) * multiplier;\n output[line++] += (a ? b : 0) * multiplier;\n if (fourthChannel) {\n output[line++] += a * multiplier;\n trustworthyColorsCount[line / channelsNum - 1] += a ? multiplier : 0;\n }\n }\n\n if (weight >= amountToNext) {\n actualPosition += channelsNum;\n currentPosition = actualPosition;\n weight -= amountToNext;\n } else {\n currentPosition += weight;\n break;\n }\n } while (\n weight > 0 &&\n actualPosition < this.originalWidthMultipliedByChannels\n );\n\n for (\n line = 0, pixelOffset = 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this.outputHeightWorkBenchOpaquePixelsCount;\n\n let weight = 0;\n let amountToNext = 0;\n let actualPosition = 0;\n let currentPosition = 0;\n let pixelOffset = 0;\n let outputOffset = 0;\n let caret = 0;\n let multiplier = 1;\n let r = 0;\n let g = 0;\n let b = 0;\n let a = 0;\n\n do {\n for (\n pixelOffset = 0;\n pixelOffset < this.targetWidthMultipliedByChannels;\n\n ) {\n output[pixelOffset++] = 0;\n output[pixelOffset++] = 0;\n output[pixelOffset++] = 0;\n\n if (fourthChannel) {\n output[pixelOffset++] = 0;\n trustworthyColorsCount[pixelOffset / 4 - 1] = 0;\n }\n }\n\n weight = ratioWeight;\n\n do {\n amountToNext = 1 + actualPosition - currentPosition;\n multiplier = Math.min(weight, amountToNext);\n caret = actualPosition;\n\n for (\n pixelOffset = 0;\n pixelOffset < this.targetWidthMultipliedByChannels;\n\n ) {\n r = buffer[caret++];\n g = buffer[caret++];\n b = buffer[caret++];\n a = fourthChannel ? buffer[caret++] : 255;\n // Ignore RGB values if pixel is completely transparent\n output[pixelOffset++] += (a ? r : 0) * multiplier;\n output[pixelOffset++] += (a ? g : 0) * multiplier;\n output[pixelOffset++] += (a ? b : 0) * multiplier;\n\n if (fourthChannel) {\n output[pixelOffset++] += a * multiplier;\n trustworthyColorsCount[pixelOffset / 4 - 1] += a ? multiplier : 0;\n }\n }\n\n if (weight >= amountToNext) {\n actualPosition = caret;\n currentPosition = actualPosition;\n weight -= amountToNext;\n } else {\n currentPosition += weight;\n break;\n }\n } while (weight > 0 && actualPosition < this.widthPassResultSize);\n\n for (\n pixelOffset = 0;\n pixelOffset < this.targetWidthMultipliedByChannels;\n\n ) {\n weight = fourthChannel ? trustworthyColorsCount[pixelOffset / 4] : 1;\n multiplier = fourthChannel\n ? weight\n ? 1 / weight\n : 0\n : ratioWeightDivisor;\n outputBuffer[outputOffset++] = Math.round(\n output[pixelOffset++] * multiplier\n );\n outputBuffer[outputOffset++] = Math.round(\n output[pixelOffset++] * multiplier\n );\n outputBuffer[outputOffset++] = Math.round(\n output[pixelOffset++] * multiplier\n );\n\n if (fourthChannel) {\n outputBuffer[outputOffset++] = Math.round(\n output[pixelOffset++] * ratioWeightDivisor\n );\n }\n }\n } while (outputOffset < this.finalResultSize);\n\n return outputBuffer;\n};\n\nResize.prototype.resizeWidthInterpolatedRGB = function(buffer) {\n return this._resizeWidthInterpolatedRGBChannels(buffer, false);\n};\n\nResize.prototype.resizeWidthInterpolatedRGBA = function(buffer) {\n return this._resizeWidthInterpolatedRGBChannels(buffer, true);\n};\n\nResize.prototype.resizeWidthRGB = function(buffer) {\n return this._resizeWidthRGBChannels(buffer, false);\n};\n\nResize.prototype.resizeWidthRGBA = function(buffer) {\n return this._resizeWidthRGBChannels(buffer, true);\n};\n\nResize.prototype.resizeHeightInterpolated = function(buffer) {\n const ratioWeight = this.ratioWeightHeightPass;\n const outputBuffer = this.heightBuffer;\n\n let weight = 0;\n let finalOffset = 0;\n let pixelOffset = 0;\n let pixelOffsetAccumulated = 0;\n let pixelOffsetAccumulated2 = 0;\n let firstWeight = 0;\n let secondWeight = 0;\n let interpolationHeightSourceReadStop;\n\n // Handle for only one interpolation input being valid for start calculation:\n for (; weight < 1 / 3; weight += ratioWeight) {\n for (\n pixelOffset = 0;\n pixelOffset < this.targetWidthMultipliedByChannels;\n\n ) {\n outputBuffer[finalOffset++] = Math.round(buffer[pixelOffset++]);\n }\n }\n\n // Adjust for overshoot of the last pass's counter:\n weight -= 1 / 3;\n\n for (\n interpolationHeightSourceReadStop = this.heightOriginal - 1;\n weight < interpolationHeightSourceReadStop;\n weight += ratioWeight\n ) {\n // Calculate weightings:\n secondWeight = weight % 1;\n firstWeight = 1 - secondWeight;\n // Interpolate:\n pixelOffsetAccumulated =\n Math.floor(weight) * this.targetWidthMultipliedByChannels;\n pixelOffsetAccumulated2 =\n pixelOffsetAccumulated + this.targetWidthMultipliedByChannels;\n for (\n pixelOffset = 0;\n pixelOffset < this.targetWidthMultipliedByChannels;\n ++pixelOffset\n ) {\n outputBuffer[finalOffset++] = Math.round(\n buffer[pixelOffsetAccumulated++] * firstWeight +\n buffer[pixelOffsetAccumulated2++] * secondWeight\n );\n }\n }\n\n // Handle for only one interpolation input being valid for end calculation:\n while (finalOffset < this.finalResultSize) {\n for (\n pixelOffset = 0,\n pixelOffsetAccumulated =\n interpolationHeightSourceReadStop *\n this.targetWidthMultipliedByChannels;\n pixelOffset < this.targetWidthMultipliedByChannels;\n ++pixelOffset\n ) {\n outputBuffer[finalOffset++] = Math.round(\n buffer[pixelOffsetAccumulated++]\n );\n }\n }\n\n return outputBuffer;\n};\n\nResize.prototype.resizeHeightRGB = function(buffer) {\n return this._resizeHeightRGBChannels(buffer, false);\n};\n\nResize.prototype.resizeHeightRGBA = function(buffer) {\n return this._resizeHeightRGBChannels(buffer, true);\n};\n\nResize.prototype.resize = function(buffer) {\n this.resizeCallback(this.resizeHeight(this.resizeWidth(buffer)));\n};\n\nResize.prototype.bypassResizer = function(buffer) {\n // Just return the buffer passed:\n return buffer;\n};\n\nResize.prototype.initializeFirstPassBuffers = function(BILINEARAlgo) {\n // Initialize the internal width pass buffers:\n this.widthBuffer = this.generateFloatBuffer(this.widthPassResultSize);\n\n if (!BILINEARAlgo) {\n this.outputWidthWorkBench = this.generateFloatBuffer(\n this.originalHeightMultipliedByChannels\n );\n\n if (this.colorChannels > 3) {\n this.outputWidthWorkBenchOpaquePixelsCount = this.generateFloat64Buffer(\n this.heightOriginal\n );\n }\n }\n};\n\nResize.prototype.initializeSecondPassBuffers = function(BILINEARAlgo) {\n // Initialize the internal height pass buffers:\n this.heightBuffer = this.generateUint8Buffer(this.finalResultSize);\n\n if (!BILINEARAlgo) {\n this.outputHeightWorkBench = this.generateFloatBuffer(\n this.targetWidthMultipliedByChannels\n );\n\n if (this.colorChannels > 3) {\n this.outputHeightWorkBenchOpaquePixelsCount = this.generateFloat64Buffer(\n this.targetWidth\n );\n }\n }\n};\n\nResize.prototype.generateFloatBuffer = function(bufferLength) {\n // Generate a float32 typed array buffer:\n try {\n return new Float32Array(bufferLength);\n } catch (error) {\n return [];\n }\n};\n\nResize.prototype.generateFloat64Buffer = function(bufferLength) {\n // Generate a float64 typed array buffer:\n try {\n return new Float64Array(bufferLength);\n } catch (error) {\n return [];\n }\n};\n\nResize.prototype.generateUint8Buffer = function(bufferLength) {\n // Generate a uint8 typed array buffer:\n try {\n return new Uint8Array(bufferLength);\n } catch (error) {\n return [];\n }\n};\n\nmodule.exports = Resize;\n"],"file":"resize.js"} |