Fixing lab colorspace component input ranges. Fix Indexed cs Image to…

… rgb conversion.

pdf/contentstream/processor.go

@@ -202,6 +202,8 @@ func (this *ContentStreamProcessor) Process(resources *PdfPageResources) error {
 	this.graphicsState.ColorNonStroking = NewPdfColorDeviceGray(0)
 
 	for _, op := range this.operations {
+		var err error
+
 		// Internal handling.
 		switch op.Operand {
 		case "q":
@@ -211,65 +213,34 @@ func (this *ContentStreamProcessor) Process(resources *PdfPageResources) error {
 
 		// Color operations (Table 74 p. 179)
 		case "CS":
-			err := this.handleCommand_CS(op, resources)
-			if err != nil {
-				return err
-			}
+			err = this.handleCommand_CS(op, resources)
 		case "cs":
-			err := this.handleCommand_cs(op, resources)
-			if err != nil {
-				return err
-			}
+			err = this.handleCommand_cs(op, resources)
 		case "SC":
-			err := this.handleCommand_SC(op, resources)
-			if err != nil {
-				return err
-			}
+			err = this.handleCommand_SC(op, resources)
 		case "SCN":
-			err := this.handleCommand_SCN(op, resources)
-			if err != nil {
-				return err
-			}
+			err = this.handleCommand_SCN(op, resources)
 		case "sc":
-			err := this.handleCommand_sc(op, resources)
-			if err != nil {
-				return err
-			}
+			err = this.handleCommand_sc(op, resources)
 		case "scn":
-			err := this.handleCommand_scn(op, resources)
-			if err != nil {
-				return err
-			}
+			err = this.handleCommand_scn(op, resources)
 		case "G":
-			err := this.handleCommand_G(op, resources)
-			if err != nil {
-				return err
-			}
+			err = this.handleCommand_G(op, resources)
 		case "g":
-			err := this.handleCommand_g(op, resources)
-			if err != nil {
-				return err
-			}
+			err = this.handleCommand_g(op, resources)
 		case "RG":
-			err := this.handleCommand_RG(op, resources)
-			if err != nil {
-				return err
-			}
+			err = this.handleCommand_RG(op, resources)
 		case "rg":
-			err := this.handleCommand_rg(op, resources)
-			if err != nil {
-				return err
-			}
+			err = this.handleCommand_rg(op, resources)
 		case "K":
-			err := this.handleCommand_K(op, resources)
-			if err != nil {
-				return err
-			}
+			err = this.handleCommand_K(op, resources)
 		case "k":
-			err := this.handleCommand_k(op, resources)
-			if err != nil {
-				return err
-			}
+			err = this.handleCommand_k(op, resources)
+		}
+		if err != nil {
+			common.Log.Debug("Processor handling error (%s): %v", op.Operand, err)
+			common.Log.Debug("Operand: %#v", op.Operand)
+			return err
 		}
 
 		// Check if have external handler also, and process if so.
@@ -440,6 +411,7 @@ func (this *ContentStreamProcessor) handleCommand_scn(op *ContentStreamOperation
 
 	color, err := cs.ColorFromPdfObjects(op.Params)
 	if err != nil {
+		common.Log.Debug("ERROR: Fail to get color from params: %+v (CS is %+v)", op.Params, cs)
 		return err
 	}
 

pdf/model/colorspace.go

@@ -1413,19 +1413,34 @@ func (this *PdfColorspaceLab) ColorFromFloats(vals []float64) (PdfColor, error)
 
 	// L
 	l := vals[0]
-	if l < 0.0 || l > 1.0 {
+	if l < 0.0 || l > 100.0 {
+		common.Log.Debug("L out of range (got %v should be 0-100)", l)
 		return nil, errors.New("Range check")
 	}
 
 	// A
 	a := vals[1]
-	if a < 0.0 || a > 1.0 {
+	aMin := float64(-100)
+	aMax := float64(100)
+	if len(this.Range) > 1 {
+		aMin = this.Range[0]
+		aMax = this.Range[1]
+	}
+	if a < aMin || a > aMax {
+		common.Log.Debug("A out of range (got %v; range %v to %v)", a, aMin, aMax)
 		return nil, errors.New("Range check")
 	}
 
 	// B.
 	b := vals[2]
-	if b < 0.0 || b > 1.0 {
+	bMin := float64(-100)
+	bMax := float64(100)
+	if len(this.Range) > 3 {
+		bMin = this.Range[2]
+		bMax = this.Range[3]
+	}
+	if b < bMin || b > bMax {
+		common.Log.Debug("b out of range (got %v; range %v to %v)", b, bMin, bMax)
 		return nil, errors.New("Range check")
 	}
 
@@ -1462,6 +1477,8 @@ func (this *PdfColorspaceLab) ColorToRGB(color PdfColor) (PdfColor, error) {
 	}
 
 	// Get normalized L*, a*, b* values. [0-1]
+	// XXX/FIXME: According to the pdf standard these values are going to be in range 0-100, -100 - 100, -100 - 100
+	// by default.
 	LNorm := lab.L()
 	ANorm := lab.A()
 	BNorm := lab.B()
@@ -2207,7 +2224,15 @@ func (this *PdfColorspaceSpecialIndexed) ColorToRGB(color PdfColor) (PdfColor, e
 
 // Convert an indexed image to RGB.
 func (this *PdfColorspaceSpecialIndexed) ImageToRGB(img Image) (Image, error) {
-	baseImage := img
+	//baseImage := img
+	// Make a new representation of the image to be converted with the base colorspace.
+	baseImage := Image{}
+	baseImage.Height = img.Height
+	baseImage.Width = img.Width
+	baseImage.alphaData = img.alphaData
+	baseImage.BitsPerComponent = img.BitsPerComponent
+	baseImage.hasAlpha = img.hasAlpha
+	baseImage.ColorComponents = img.ColorComponents
 
 	samples := img.GetSamples()
 	N := this.Base.GetNumComponents()
@@ -2371,11 +2396,15 @@ func (this *PdfColorspaceSpecialSeparation) ColorFromFloats(vals []float64) (Pdf
 	input := []float64{tint}
 	output, err := this.TintTransform.Evaluate(input)
 	if err != nil {
+		common.Log.Debug("Error, failed to evaluate: %v", err)
+		common.Log.Trace("Tint transform: %+v", this.TintTransform)
 		return nil, err
 	}
 
+	common.Log.Trace("Processing ColorFromFloats(%+v) on AlternateSpace: %#v", output, this.AlternateSpace)
 	color, err := this.AlternateSpace.ColorFromFloats(output)
 	if err != nil {
+		common.Log.Debug("Error, failed to evaluate in alternate space: %v", err)
 		return nil, err
 	}
 
@@ -2469,6 +2498,7 @@ func (this *PdfColorspaceDeviceN) String() string {
 	return "DeviceN"
 }
 
+// GetNumComponents returns the number of input color components, i.e. that are input to the tint transform.
 func (this *PdfColorspaceDeviceN) GetNumComponents() int {
 	return len(*this.ColorantNames)
 }