PdfObject getColorspace() { if (icc_profile != null) { if ((colorType & 2) == 0) return PdfName.DEVICEGRAY; else return PdfName.DEVICERGB; } if (gamma == 1f && !hasCHRM) { if ((colorType & 2) == 0) return PdfName.DEVICEGRAY; else return PdfName.DEVICERGB; } else { PdfArray array = new PdfArray(); PdfDictionary dic = new PdfDictionary(); if ((colorType & 2) == 0) { if (gamma == 1f) return PdfName.DEVICEGRAY; array.add(PdfName.CALGRAY); dic.put(PdfName.GAMMA, new PdfNumber(gamma)); dic.put(PdfName.WHITEPOINT, new PdfLiteral("[1 1 1]")); array.add(dic); } else { PdfObject wp = new PdfLiteral("[1 1 1]"); array.add(PdfName.CALRGB); if (gamma != 1f) { PdfArray gm = new PdfArray(); PdfNumber n = new PdfNumber(gamma); gm.add(n); gm.add(n); gm.add(n); dic.put(PdfName.GAMMA, gm); } if (hasCHRM) { float z = yW * ((xG - xB) * yR - (xR - xB) * yG + (xR - xG) * yB); float YA = yR * ((xG - xB) * yW - (xW - xB) * yG + (xW - xG) * yB) / z; float XA = YA * xR / yR; float ZA = YA * ((1 - xR) / yR - 1); float YB = -yG * ((xR - xB) * yW - (xW - xB) * yR + (xW - xR) * yB) / z; float XB = YB * xG / yG; float ZB = YB * ((1 - xG) / yG - 1); float YC = yB * ((xR - xG) * yW - (xW - xG) * yW + (xW - xR) * yG) / z; float XC = YC * xB / yB; float ZC = YC * ((1 - xB) / yB - 1); float XW = XA + XB + XC; float YW = 1; // YA+YB+YC; float ZW = ZA + ZB + ZC; PdfArray wpa = new PdfArray(); wpa.add(new PdfNumber(XW)); wpa.add(new PdfNumber(YW)); wpa.add(new PdfNumber(ZW)); wp = wpa; PdfArray matrix = new PdfArray(); matrix.add(new PdfNumber(XA)); matrix.add(new PdfNumber(YA)); matrix.add(new PdfNumber(ZA)); matrix.add(new PdfNumber(XB)); matrix.add(new PdfNumber(YB)); matrix.add(new PdfNumber(ZB)); matrix.add(new PdfNumber(XC)); matrix.add(new PdfNumber(YC)); matrix.add(new PdfNumber(ZC)); dic.put(PdfName.MATRIX, matrix); } dic.put(PdfName.WHITEPOINT, wp); array.add(dic); } return array; } }
void readPng() throws IOException { for (int i = 0; i < PNGID.length; i++) { if (PNGID[i] != is.read()) { throw new IOException("File is not a valid PNG."); } } byte buffer[] = new byte[TRANSFERSIZE]; while (true) { int len = getInt(is); String marker = getString(is); if (len < 0 || !checkMarker(marker)) throw new IOException("Corrupted PNG file."); if (IDAT.equals(marker)) { int size; while (len != 0) { size = is.read(buffer, 0, Math.min(len, TRANSFERSIZE)); if (size < 0) return; idat.write(buffer, 0, size); len -= size; } } else if (tRNS.equals(marker)) { switch (colorType) { case 0: if (len >= 2) { len -= 2; int gray = getWord(is); if (bitDepth == 16) transRedGray = gray; else additional.put(PdfName.MASK, new PdfLiteral("[" + gray + " " + gray + "]")); } break; case 2: if (len >= 6) { len -= 6; int red = getWord(is); int green = getWord(is); int blue = getWord(is); if (bitDepth == 16) { transRedGray = red; transGreen = green; transBlue = blue; } else additional.put( PdfName.MASK, new PdfLiteral( "[" + red + " " + red + " " + green + " " + green + " " + blue + " " + blue + "]")); } break; case 3: if (len > 0) { trans = new byte[len]; for (int k = 0; k < len; ++k) trans[k] = (byte) is.read(); len = 0; } break; } Utilities.skip(is, len); } else if (IHDR.equals(marker)) { width = getInt(is); height = getInt(is); bitDepth = is.read(); colorType = is.read(); compressionMethod = is.read(); filterMethod = is.read(); interlaceMethod = is.read(); } else if (PLTE.equals(marker)) { if (colorType == 3) { PdfArray colorspace = new PdfArray(); colorspace.add(PdfName.INDEXED); colorspace.add(getColorspace()); colorspace.add(new PdfNumber(len / 3 - 1)); ByteBuffer colortable = new ByteBuffer(); while ((len--) > 0) { colortable.append_i(is.read()); } colorspace.add(new PdfString(colorTable = colortable.toByteArray())); additional.put(PdfName.COLORSPACE, colorspace); } else { Utilities.skip(is, len); } } else if (pHYs.equals(marker)) { int dx = getInt(is); int dy = getInt(is); int unit = is.read(); if (unit == 1) { dpiX = (int) ((float) dx * 0.0254f + 0.5f); dpiY = (int) ((float) dy * 0.0254f + 0.5f); } else { if (dy != 0) XYRatio = (float) dx / (float) dy; } } else if (cHRM.equals(marker)) { xW = (float) getInt(is) / 100000f; yW = (float) getInt(is) / 100000f; xR = (float) getInt(is) / 100000f; yR = (float) getInt(is) / 100000f; xG = (float) getInt(is) / 100000f; yG = (float) getInt(is) / 100000f; xB = (float) getInt(is) / 100000f; yB = (float) getInt(is) / 100000f; hasCHRM = !(Math.abs(xW) < 0.0001f || Math.abs(yW) < 0.0001f || Math.abs(xR) < 0.0001f || Math.abs(yR) < 0.0001f || Math.abs(xG) < 0.0001f || Math.abs(yG) < 0.0001f || Math.abs(xB) < 0.0001f || Math.abs(yB) < 0.0001f); } else if (sRGB.equals(marker)) { int ri = is.read(); intent = intents[ri]; gamma = 2.2f; xW = 0.3127f; yW = 0.329f; xR = 0.64f; yR = 0.33f; xG = 0.3f; yG = 0.6f; xB = 0.15f; yB = 0.06f; hasCHRM = true; } else if (gAMA.equals(marker)) { int gm = getInt(is); if (gm != 0) { gamma = 100000f / (float) gm; if (!hasCHRM) { xW = 0.3127f; yW = 0.329f; xR = 0.64f; yR = 0.33f; xG = 0.3f; yG = 0.6f; xB = 0.15f; yB = 0.06f; hasCHRM = true; } } } else if (iCCP.equals(marker)) { do { --len; } while (is.read() != 0); is.read(); --len; byte icccom[] = new byte[len]; int p = 0; while (len > 0) { int r = is.read(icccom, p, len); if (r < 0) throw new IOException("Premature end of file."); p += r; len -= r; } byte iccp[] = PdfReader.FlateDecode(icccom, true); icccom = null; // try { // icc_profile = ICC_Profile.getInstance(iccp); // } // catch (Exception e) { icc_profile = null; // } } else if (IEND.equals(marker)) { break; } else { Utilities.skip(is, len); } Utilities.skip(is, 4); } }