redstrate/silica-viewer
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Insert more error checks

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This commit is contained in:
Joshua Goins 2022-11-21 11:40:05 -05:00
parent 18392104cd
commit ef10d11098
1 changed files with 30 additions and 16 deletions
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46
SilicaViewer/SilicaEngine.swift
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@ -43,9 +43,11 @@ class SilicaEngine {
var maskContext: CGContext?
let kernel = getBlendKernel(layer)
guard let kernel = getBlendKernel(layer) else {
return nil
}
if layer.mask != nil {
if let mask = layer.mask {
let grayColorSpace = CGColorSpaceCreateDeviceGray()
let maskBitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.none.rawValue).union(.byteOrder16Big)
@ -60,7 +62,7 @@ class SilicaEngine {
maskContext?.setFillColor(.white)
maskContext?.fill(document.cgRect())
for chunk in layer.mask!.chunks {
for chunk in mask.chunks {
if let image = chunk.image {
maskContext?.draw(image, in: document.getChunkRect(chunk))
}
@ -72,7 +74,9 @@ class SilicaEngine {
layerContext?.setBlendMode(.normal)
if !layer.data.hidden {
layerContext?.draw(chunk.image!, in: document.getChunkRect(chunk))
if let image = chunk.image {
layerContext?.draw(image, in: document.getChunkRect(chunk))
}
}
}
@ -83,9 +87,9 @@ class SilicaEngine {
var clippedMaster: CGImage? = layerImage
for layer in clippingLayers {
// so we if we want to clip, we want to gather all of the clipping layers in order first...
let temporaryClippedMaster = blendLayer(document: document, layer: layer, previousImage: &clippedMaster)
clippedMaster = context.createCGImage(temporaryClippedMaster, from: document.cgRect(), format: .RGBA8, colorSpace: document.colorSpace)
if let temporaryClippedMaster = blendLayer(document: document, layer: layer, previousImage: &clippedMaster) {
clippedMaster = context.createCGImage(temporaryClippedMaster, from: document.cgRect(), format: .RGBA8, colorSpace: document.colorSpace)
}
}
layerContext?.setAlpha(1.0)
@ -106,7 +110,9 @@ class SilicaEngine {
}
// apply image
masterImage = kernel!.apply(foreground: CIImage(cgImage: previousImage!), background: masterImage, colorSpace: document.colorSpace)!
masterImage = kernel.apply(foreground: CIImage(cgImage: previousImage!),
background: masterImage,
colorSpace: document.colorSpace)!
}
}
@ -116,7 +122,7 @@ class SilicaEngine {
func makeBlendImage(document: SilicaDocument, layer: SilicaLayer) -> CGImage {
var maskContext: CGContext?
if layer.mask != nil {
if let mask = layer.mask {
let grayColorSpace = CGColorSpaceCreateDeviceGray()
let maskBitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.none.rawValue).union(.byteOrder16Big)
@ -131,8 +137,10 @@ class SilicaEngine {
maskContext?.setFillColor(.white)
maskContext?.fill(document.cgRect())
for chunk in layer.mask!.chunks {
maskContext?.draw(chunk.image!, in: document.getChunkRect(chunk))
for chunk in mask.chunks {
if let image = chunk.image {
maskContext?.draw(image, in: document.getChunkRect(chunk))
}
}
}
@ -161,7 +169,9 @@ class SilicaEngine {
layerContext?.setBlendMode(.normal)
if !layer.hidden {
layerContext?.draw(chunk.image!, in: document.getChunkRect(chunk))
if let image = chunk.image {
layerContext?.draw(image, in: document.getChunkRect(chunk))
}
}
}
@ -173,7 +183,7 @@ class SilicaEngine {
/// - layer: The `SilicaLayer` to draw.
/// - previousImage: Previous `CGImage` to draw on top of, can be null.
/// - Returns: A `CIImage` of the new image.
func blendLayer(document: SilicaDocument, layer : SilicaLayer, previousImage : inout CGImage?) -> CIImage {
func blendLayer(document: SilicaDocument, layer : SilicaLayer, previousImage : inout CGImage?) -> CIImage? {
let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.premultipliedLast.rawValue).union(.byteOrder32Big)
// start by creating a new layer composite image, needed for image masking
@ -187,21 +197,25 @@ class SilicaEngine {
layerContext?.clear(document.cgRect())
let kernel = getBlendKernel(layer)
guard let kernel = getBlendKernel(layer) else {
return nil
}
for chunk in layer.data.chunks {
layerContext?.setAlpha(CGFloat(layer.data.opacity))
layerContext?.setBlendMode(.normal)
if !layer.data.hidden {
layerContext?.draw(chunk.image!, in: document.getChunkRect(chunk))
if let image = chunk.image {
layerContext?.draw(image, in: document.getChunkRect(chunk))
}
}
}
let layerImage = layerContext?.makeImage()
// apply image
return kernel!.apply(foreground: CIImage(cgImage: layerImage!), background: previousImage == nil ? CIImage(color: .clear) : CIImage(cgImage: previousImage!), colorSpace: document.colorSpace)!
return kernel.apply(foreground: CIImage(cgImage: layerImage!), background: previousImage == nil ? CIImage(color: .clear) : CIImage(cgImage: previousImage!), colorSpace: document.colorSpace)!
}
/// Figures out the correct `CIBlendKernel` corresponding to the `SilicaLayer`'s blending mode.