pdfcontentstreamprocessor.java

来自「源码包含生成 PDF 和 HTML 的类库」· Java 代码 · 共 532 行 · 第 1/2 页

        }
    }

    /**
     * A content operator implementation (").
     */
    private static class MoveNextLineAndShowTextWithSpacing implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            PdfNumber aw = (PdfNumber)operands.get(0);
            PdfNumber ac = (PdfNumber)operands.get(1);
            PdfString string = (PdfString)operands.get(2);
            
            ArrayList twOperands = new ArrayList(1);
            twOperands.add(0, aw);
            processor.invokeOperator(new PdfLiteral("Tw"), twOperands);

            ArrayList tcOperands = new ArrayList(1);
            tcOperands.add(0, ac);
            processor.invokeOperator(new PdfLiteral("Tc"), tcOperands);
            
            ArrayList tickOperands = new ArrayList(1);
            tickOperands.add(0, string);
            processor.invokeOperator(new PdfLiteral("'"), tickOperands);
        }
    }

    /**
     * A content operator implementation (').
     */
    private static class MoveNextLineAndShowText implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            processor.invokeOperator(new PdfLiteral("T*"), new ArrayList(0));
            processor.invokeOperator(new PdfLiteral("Tj"), operands);
        }
    }

    /**
     * A content operator implementation (Tj).
     */
    private static class ShowText implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            PdfString string = (PdfString)operands.get(0);
            
            processor.displayPdfString(string, 0);
        }
    }
    

    /**
     * A content operator implementation (T*).
     */
    private static class TextMoveNextLine implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            ArrayList tdoperands = new ArrayList(2);
            tdoperands.add(0, new PdfNumber(0));
            tdoperands.add(1, new PdfNumber(processor.gs().leading));
            processor.invokeOperator(new PdfLiteral("Td"), tdoperands);
        }
    }

    /**
     * A content operator implementation (Tm).
     */
    private static class TextSetTextMatrix implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            float a = ((PdfNumber)operands.get(0)).floatValue();
            float b = ((PdfNumber)operands.get(1)).floatValue();
            float c = ((PdfNumber)operands.get(2)).floatValue();
            float d = ((PdfNumber)operands.get(3)).floatValue();
            float e = ((PdfNumber)operands.get(4)).floatValue();
            float f = ((PdfNumber)operands.get(5)).floatValue();
            
            processor.textLineMatrix = new Matrix(a, b, c, d, e, f);
            processor.textMatrix = processor.textLineMatrix;
        }
    }

    /**
     * A content operator implementation (TD).
     */
    private static class TextMoveStartNextLineWithLeading implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            float ty = ((PdfNumber)operands.get(1)).floatValue();
            
            ArrayList tlOperands = new ArrayList(1);
            tlOperands.add(0, new PdfNumber(-ty));
            processor.invokeOperator(new PdfLiteral("TL"), tlOperands);
            processor.invokeOperator(new PdfLiteral("Td"), operands);
        }
    }

    /**
     * A content operator implementation (Td).
     */
    private static class TextMoveStartNextLine implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            float tx = ((PdfNumber)operands.get(0)).floatValue();
            float ty = ((PdfNumber)operands.get(1)).floatValue();
            
            Matrix translationMatrix = new Matrix(tx, ty);
            processor.textMatrix =  translationMatrix.multiply(processor.textLineMatrix);
            processor.textLineMatrix = processor.textMatrix;
        }
    }

    /**
     * A content operator implementation (Tf).
     */
    private static class SetTextFont implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            PdfName fontResourceName = (PdfName)operands.get(0);
            float size = ((PdfNumber)operands.get(1)).floatValue();
            
            PdfDictionary fontsDictionary = processor.resources.getAsDict(PdfName.FONT);
            CMapAwareDocumentFont font = new CMapAwareDocumentFont((PRIndirectReference)fontsDictionary.get(fontResourceName));
            
            processor.gs().font = font;
            processor.gs().fontSize = size;
            
        }
    }

    /**
     * A content operator implementation (Tr).
     */
    private static class SetTextRenderMode implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            PdfNumber render = (PdfNumber)operands.get(0);
            processor.gs().renderMode = render.intValue();
        }
    }

    /**
     * A content operator implementation (Ts).
     */
    private static class SetTextRise implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            PdfNumber rise = (PdfNumber)operands.get(0);
            processor.gs().rise = rise.floatValue();
        }
    }

    /**
     * A content operator implementation (TL).
     */
    private static class SetTextLeading implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            PdfNumber leading = (PdfNumber)operands.get(0);
            processor.gs().leading = leading.floatValue();
        }
    }

    /**
     * A content operator implementation (Tz).
     */
    private static class SetTextHorizontalScaling implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            PdfNumber scale = (PdfNumber)operands.get(0);
            processor.gs().horizontalScaling = scale.floatValue();
        }
    }

    /**
     * A content operator implementation (Tc).
     */
    private static class SetTextCharacterSpacing implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            PdfNumber charSpace = (PdfNumber)operands.get(0);
            processor.gs().characterSpacing = charSpace.floatValue();
        }
    }

    /**
     * A content operator implementation (Tw).
     */
    private static class SetTextWordSpacing implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            PdfNumber wordSpace = (PdfNumber)operands.get(0);
            processor.gs().wordSpacing = wordSpace.floatValue();
        }
    }

    /**
     * A content operator implementation (gs).
     */
    private static class ProcessGraphicsStateResource implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            PdfName dictionaryName = (PdfName)operands.get(0);
            PdfDictionary extGState = processor.resources.getAsDict(PdfName.EXTGSTATE);
            if (extGState == null)
                throw new IllegalArgumentException("Resources do not contain ExtGState entry. Unable to process operator " + operator);
            PdfDictionary gsDic = extGState.getAsDict(dictionaryName);
            if (gsDic == null)
                throw new IllegalArgumentException(dictionaryName + " is an unknown graphics state dictionary");
            
            // at this point, all we care about is the FONT entry in the GS dictionary
            PdfArray fontParameter = gsDic.getAsArray(PdfName.FONT);
            if (fontParameter != null){
                CMapAwareDocumentFont font = new CMapAwareDocumentFont((PRIndirectReference)fontParameter.getPdfObject(0));
                float size = fontParameter.getAsNumber(1).floatValue();
                
                processor.gs().font = font;
                processor.gs().fontSize = size;
            }            
        }
    }

    /**
     * A content operator implementation (q).
     */
    private static class PushGraphicsState implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            GraphicsState gs = (GraphicsState) processor.gsStack.peek();
            GraphicsState copy = new GraphicsState(gs);
            processor.gsStack.push(copy);
        }
    }
    
    /**
     * A content operator implementation (cm).
     */
    private static class ModifyCurrentTransformationMatrix implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            float a = ((PdfNumber)operands.get(0)).floatValue();
            float b = ((PdfNumber)operands.get(1)).floatValue();
            float c = ((PdfNumber)operands.get(2)).floatValue();
            float d = ((PdfNumber)operands.get(3)).floatValue();
            float e = ((PdfNumber)operands.get(4)).floatValue();
            float f = ((PdfNumber)operands.get(5)).floatValue();
            Matrix matrix = new Matrix(a, b, c, d, e, f);
            GraphicsState gs = (GraphicsState)processor.gsStack.peek();
            gs.ctm = gs.ctm.multiply(matrix);
        }
    }

    /**
     * A content operator implementation (Q).
     */
    private static class PopGraphicsState implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            processor.gsStack.pop();
        }
    }

    /**
     * A content operator implementation (BT).
     */
    private static class BeginText implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            processor.textMatrix = new Matrix();
            processor.textLineMatrix = processor.textMatrix;
        }
    }

    /**
     * A content operator implementation (ET).
     */
    private static class EndText implements ContentOperator{
        public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList operands) {
            processor.textMatrix = null;
            processor.textLineMatrix = null;
        }
    }
    
}