[IMP] website: PDFJS lib - GitHub import

* Import src, web and external directories from PDFJS GitHub repo

1 files changed, 425 insertions, 0 deletions

diff --git a/addons/website/static/lib/pdfjs/src/display/pattern_helper.js b/addons/website/static/lib/pdfjs/src/display/pattern_helper.js
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index 00000000000..e23dc0a8e5d
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@@ -0,0 +1,425 @@
+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
+/* Copyright 2014 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/* globals CanvasGraphics, CachedCanvases, ColorSpace, Util, error, info,
+           isArray, makeCssRgb, WebGLUtils */
+
+'use strict';
+
+var ShadingIRs = {};
+
+ShadingIRs.RadialAxial = {
+  fromIR: function RadialAxial_fromIR(raw) {
+    var type = raw[1];
+    var colorStops = raw[2];
+    var p0 = raw[3];
+    var p1 = raw[4];
+    var r0 = raw[5];
+    var r1 = raw[6];
+    return {
+      type: 'Pattern',
+      getPattern: function RadialAxial_getPattern(ctx) {
+        var grad;
+        if (type === 'axial') {
+          grad = ctx.createLinearGradient(p0[0], p0[1], p1[0], p1[1]);
+        } else if (type === 'radial') {
+          grad = ctx.createRadialGradient(p0[0], p0[1], r0, p1[0], p1[1], r1);
+        }
+
+        for (var i = 0, ii = colorStops.length; i < ii; ++i) {
+          var c = colorStops[i];
+          grad.addColorStop(c[0], c[1]);
+        }
+        return grad;
+      }
+    };
+  }
+};
+
+var createMeshCanvas = (function createMeshCanvasClosure() {
+  function drawTriangle(data, context, p1, p2, p3, c1, c2, c3) {
+    // Very basic Gouraud-shaded triangle rasterization algorithm.
+    var coords = context.coords, colors = context.colors;
+    var bytes = data.data, rowSize = data.width * 4;
+    var tmp;
+    if (coords[p1 + 1] > coords[p2 + 1]) {
+      tmp = p1; p1 = p2; p2 = tmp; tmp = c1; c1 = c2; c2 = tmp;
+    }
+    if (coords[p2 + 1] > coords[p3 + 1]) {
+      tmp = p2; p2 = p3; p3 = tmp; tmp = c2; c2 = c3; c3 = tmp;
+    }
+    if (coords[p1 + 1] > coords[p2 + 1]) {
+      tmp = p1; p1 = p2; p2 = tmp; tmp = c1; c1 = c2; c2 = tmp;
+    }
+    var x1 = (coords[p1] + context.offsetX) * context.scaleX;
+    var y1 = (coords[p1 + 1] + context.offsetY) * context.scaleY;
+    var x2 = (coords[p2] + context.offsetX) * context.scaleX;
+    var y2 = (coords[p2 + 1] + context.offsetY) * context.scaleY;
+    var x3 = (coords[p3] + context.offsetX) * context.scaleX;
+    var y3 = (coords[p3 + 1] + context.offsetY) * context.scaleY;
+    if (y1 >= y3) {
+      return;
+    }
+    var c1r = colors[c1], c1g = colors[c1 + 1], c1b = colors[c1 + 2];
+    var c2r = colors[c2], c2g = colors[c2 + 1], c2b = colors[c2 + 2];
+    var c3r = colors[c3], c3g = colors[c3 + 1], c3b = colors[c3 + 2];
+
+    var minY = Math.round(y1), maxY = Math.round(y3);
+    var xa, car, cag, cab;
+    var xb, cbr, cbg, cbb;
+    var k;
+    for (var y = minY; y <= maxY; y++) {
+      if (y < y2) {
+        k = y < y1 ? 0 : y1 === y2 ? 1 : (y1 - y) / (y1 - y2);
+        xa = x1 - (x1 - x2) * k;
+        car = c1r - (c1r - c2r) * k;
+        cag = c1g - (c1g - c2g) * k;
+        cab = c1b - (c1b - c2b) * k;
+      } else {
+        k = y > y3 ? 1 : y2 === y3 ? 0 : (y2 - y) / (y2 - y3);
+        xa = x2 - (x2 - x3) * k;
+        car = c2r - (c2r - c3r) * k;
+        cag = c2g - (c2g - c3g) * k;
+        cab = c2b - (c2b - c3b) * k;
+      }
+      k = y < y1 ? 0 : y > y3 ? 1 : (y1 - y) / (y1 - y3);
+      xb = x1 - (x1 - x3) * k;
+      cbr = c1r - (c1r - c3r) * k;
+      cbg = c1g - (c1g - c3g) * k;
+      cbb = c1b - (c1b - c3b) * k;
+      var x1_ = Math.round(Math.min(xa, xb));
+      var x2_ = Math.round(Math.max(xa, xb));
+      var j = rowSize * y + x1_ * 4;
+      for (var x = x1_; x <= x2_; x++) {
+        k = (xa - x) / (xa - xb);
+        k = k < 0 ? 0 : k > 1 ? 1 : k;
+        bytes[j++] = (car - (car - cbr) * k) | 0;
+        bytes[j++] = (cag - (cag - cbg) * k) | 0;
+        bytes[j++] = (cab - (cab - cbb) * k) | 0;
+        bytes[j++] = 255;
+      }
+    }
+  }
+
+  function drawFigure(data, figure, context) {
+    var ps = figure.coords;
+    var cs = figure.colors;
+    var i, ii;
+    switch (figure.type) {
+      case 'lattice':
+        var verticesPerRow = figure.verticesPerRow;
+        var rows = Math.floor(ps.length / verticesPerRow) - 1;
+        var cols = verticesPerRow - 1;
+        for (i = 0; i < rows; i++) {
+          var q = i * verticesPerRow;
+          for (var j = 0; j < cols; j++, q++) {
+            drawTriangle(data, context,
+              ps[q], ps[q + 1], ps[q + verticesPerRow],
+              cs[q], cs[q + 1], cs[q + verticesPerRow]);
+            drawTriangle(data, context,
+              ps[q + verticesPerRow + 1], ps[q + 1], ps[q + verticesPerRow],
+              cs[q + verticesPerRow + 1], cs[q + 1], cs[q + verticesPerRow]);
+          }
+        }
+        break;
+      case 'triangles':
+        for (i = 0, ii = ps.length; i < ii; i += 3) {
+          drawTriangle(data, context,
+            ps[i], ps[i + 1], ps[i + 2],
+            cs[i], cs[i + 1], cs[i + 2]);
+        }
+        break;
+      default:
+        error('illigal figure');
+        break;
+    }
+  }
+
+  function createMeshCanvas(bounds, combinesScale, coords, colors, figures,
+                            backgroundColor) {
+    // we will increase scale on some weird factor to let antialiasing take
+    // care of "rough" edges
+    var EXPECTED_SCALE = 1.1;
+    // MAX_PATTERN_SIZE is used to avoid OOM situation.
+    var MAX_PATTERN_SIZE = 3000; // 10in @ 300dpi shall be enough
+
+    var offsetX = Math.floor(bounds[0]);
+    var offsetY = Math.floor(bounds[1]);
+    var boundsWidth = Math.ceil(bounds[2]) - offsetX;
+    var boundsHeight = Math.ceil(bounds[3]) - offsetY;
+
+    var width = Math.min(Math.ceil(Math.abs(boundsWidth * combinesScale[0] *
+      EXPECTED_SCALE)), MAX_PATTERN_SIZE);
+    var height = Math.min(Math.ceil(Math.abs(boundsHeight * combinesScale[1] *
+      EXPECTED_SCALE)), MAX_PATTERN_SIZE);
+    var scaleX = boundsWidth / width;
+    var scaleY = boundsHeight / height;
+
+    var context = {
+      coords: coords,
+      colors: colors,
+      offsetX: -offsetX,
+      offsetY: -offsetY,
+      scaleX: 1 / scaleX,
+      scaleY: 1 / scaleY
+    };
+
+    var canvas, tmpCanvas, i, ii;
+    if (WebGLUtils.isEnabled) {
+      canvas = WebGLUtils.drawFigures(width, height, backgroundColor,
+                                      figures, context);
+
+      // https://bugzilla.mozilla.org/show_bug.cgi?id=972126
+      tmpCanvas = CachedCanvases.getCanvas('mesh', width, height, false);
+      tmpCanvas.context.drawImage(canvas, 0, 0);
+      canvas = tmpCanvas.canvas;
+    } else {
+      tmpCanvas = CachedCanvases.getCanvas('mesh', width, height, false);
+      var tmpCtx = tmpCanvas.context;
+
+      var data = tmpCtx.createImageData(width, height);
+      if (backgroundColor) {
+        var bytes = data.data;
+        for (i = 0, ii = bytes.length; i < ii; i += 4) {
+          bytes[i] = backgroundColor[0];
+          bytes[i + 1] = backgroundColor[1];
+          bytes[i + 2] = backgroundColor[2];
+          bytes[i + 3] = 255;
+        }
+      }
+      for (i = 0; i < figures.length; i++) {
+        drawFigure(data, figures[i], context);
+      }
+      tmpCtx.putImageData(data, 0, 0);
+      canvas = tmpCanvas.canvas;
+    }
+
+    return {canvas: canvas, offsetX: offsetX, offsetY: offsetY,
+            scaleX: scaleX, scaleY: scaleY};
+  }
+  return createMeshCanvas;
+})();
+
+ShadingIRs.Mesh = {
+  fromIR: function Mesh_fromIR(raw) {
+    //var type = raw[1];
+    var coords = raw[2];
+    var colors = raw[3];
+    var figures = raw[4];
+    var bounds = raw[5];
+    var matrix = raw[6];
+    //var bbox = raw[7];
+    var background = raw[8];
+    return {
+      type: 'Pattern',
+      getPattern: function Mesh_getPattern(ctx, owner, shadingFill) {
+        var scale;
+        if (shadingFill) {
+          scale = Util.singularValueDecompose2dScale(ctx.mozCurrentTransform);
+        } else {
+          // Obtain scale from matrix and current transformation matrix.
+          scale = Util.singularValueDecompose2dScale(owner.baseTransform);
+          if (matrix) {
+            var matrixScale = Util.singularValueDecompose2dScale(matrix);
+            scale = [scale[0] * matrixScale[0],
+                     scale[1] * matrixScale[1]];
+          }
+        }
+
+
+        // Rasterizing on the main thread since sending/queue large canvases
+        // might cause OOM.
+        var temporaryPatternCanvas = createMeshCanvas(bounds, scale, coords,
+          colors, figures, shadingFill ? null : background);
+
+        if (!shadingFill) {
+          ctx.setTransform.apply(ctx, owner.baseTransform);
+          if (matrix) {
+            ctx.transform.apply(ctx, matrix);
+          }
+        }
+
+        ctx.translate(temporaryPatternCanvas.offsetX,
+                      temporaryPatternCanvas.offsetY);
+        ctx.scale(temporaryPatternCanvas.scaleX,
+                  temporaryPatternCanvas.scaleY);
+
+        return ctx.createPattern(temporaryPatternCanvas.canvas, 'no-repeat');
+      }
+    };
+  }
+};
+
+ShadingIRs.Dummy = {
+  fromIR: function Dummy_fromIR() {
+    return {
+      type: 'Pattern',
+      getPattern: function Dummy_fromIR_getPattern() {
+        return 'hotpink';
+      }
+    };
+  }
+};
+
+function getShadingPatternFromIR(raw) {
+  var shadingIR = ShadingIRs[raw[0]];
+  if (!shadingIR) {
+    error('Unknown IR type: ' + raw[0]);
+  }
+  return shadingIR.fromIR(raw);
+}
+
+var TilingPattern = (function TilingPatternClosure() {
+  var PaintType = {
+    COLORED: 1,
+    UNCOLORED: 2
+  };
+
+  var MAX_PATTERN_SIZE = 3000; // 10in @ 300dpi shall be enough
+
+  function TilingPattern(IR, color, ctx, objs, commonObjs, baseTransform) {
+    this.operatorList = IR[2];
+    this.matrix = IR[3] || [1, 0, 0, 1, 0, 0];
+    this.bbox = IR[4];
+    this.xstep = IR[5];
+    this.ystep = IR[6];
+    this.paintType = IR[7];
+    this.tilingType = IR[8];
+    this.color = color;
+    this.objs = objs;
+    this.commonObjs = commonObjs;
+    this.baseTransform = baseTransform;
+    this.type = 'Pattern';
+    this.ctx = ctx;
+  }
+
+  TilingPattern.prototype = {
+    createPatternCanvas: function TilinPattern_createPatternCanvas(owner) {
+      var operatorList = this.operatorList;
+      var bbox = this.bbox;
+      var xstep = this.xstep;
+      var ystep = this.ystep;
+      var paintType = this.paintType;
+      var tilingType = this.tilingType;
+      var color = this.color;
+      var objs = this.objs;
+      var commonObjs = this.commonObjs;
+
+      info('TilingType: ' + tilingType);
+
+      var x0 = bbox[0], y0 = bbox[1], x1 = bbox[2], y1 = bbox[3];
+
+      var topLeft = [x0, y0];
+      // we want the canvas to be as large as the step size
+      var botRight = [x0 + xstep, y0 + ystep];
+
+      var width = botRight[0] - topLeft[0];
+      var height = botRight[1] - topLeft[1];
+
+      // Obtain scale from matrix and current transformation matrix.
+      var matrixScale = Util.singularValueDecompose2dScale(this.matrix);
+      var curMatrixScale = Util.singularValueDecompose2dScale(
+        this.baseTransform);
+      var combinedScale = [matrixScale[0] * curMatrixScale[0],
+        matrixScale[1] * curMatrixScale[1]];
+
+      // MAX_PATTERN_SIZE is used to avoid OOM situation.
+      // Use width and height values that are as close as possible to the end
+      // result when the pattern is used. Too low value makes the pattern look
+      // blurry. Too large value makes it look too crispy.
+      width = Math.min(Math.ceil(Math.abs(width * combinedScale[0])),
+        MAX_PATTERN_SIZE);
+
+      height = Math.min(Math.ceil(Math.abs(height * combinedScale[1])),
+        MAX_PATTERN_SIZE);
+
+      var tmpCanvas = CachedCanvases.getCanvas('pattern', width, height, true);
+      var tmpCtx = tmpCanvas.context;
+      var graphics = new CanvasGraphics(tmpCtx, commonObjs, objs);
+      graphics.groupLevel = owner.groupLevel;
+
+      this.setFillAndStrokeStyleToContext(tmpCtx, paintType, color);
+
+      this.setScale(width, height, xstep, ystep);
+      this.transformToScale(graphics);
+
+      // transform coordinates to pattern space
+      var tmpTranslate = [1, 0, 0, 1, -topLeft[0], -topLeft[1]];
+      graphics.transform.apply(graphics, tmpTranslate);
+
+      this.clipBbox(graphics, bbox, x0, y0, x1, y1);
+
+      graphics.executeOperatorList(operatorList);
+      return tmpCanvas.canvas;
+    },
+
+    setScale: function TilingPattern_setScale(width, height, xstep, ystep) {
+      this.scale = [width / xstep, height / ystep];
+    },
+
+    transformToScale: function TilingPattern_transformToScale(graphics) {
+      var scale = this.scale;
+      var tmpScale = [scale[0], 0, 0, scale[1], 0, 0];
+      graphics.transform.apply(graphics, tmpScale);
+    },
+
+    scaleToContext: function TilingPattern_scaleToContext() {
+      var scale = this.scale;
+      this.ctx.scale(1 / scale[0], 1 / scale[1]);
+    },
+
+    clipBbox: function clipBbox(graphics, bbox, x0, y0, x1, y1) {
+      if (bbox && isArray(bbox) && bbox.length === 4) {
+        var bboxWidth = x1 - x0;
+        var bboxHeight = y1 - y0;
+        graphics.ctx.rect(x0, y0, bboxWidth, bboxHeight);
+        graphics.clip();
+        graphics.endPath();
+      }
+    },
+
+    setFillAndStrokeStyleToContext:
+      function setFillAndStrokeStyleToContext(context, paintType, color) {
+        switch (paintType) {
+          case PaintType.COLORED:
+            var ctx = this.ctx;
+            context.fillStyle = ctx.fillStyle;
+            context.strokeStyle = ctx.strokeStyle;
+            break;
+          case PaintType.UNCOLORED:
+            var cssColor = Util.makeCssRgb(color[0], color[1], color[2]);
+            context.fillStyle = cssColor;
+            context.strokeStyle = cssColor;
+            break;
+          default:
+            error('Unsupported paint type: ' + paintType);
+        }
+      },
+
+    getPattern: function TilingPattern_getPattern(ctx, owner) {
+      var temporaryPatternCanvas = this.createPatternCanvas(owner);
+
+      ctx = this.ctx;
+      ctx.setTransform.apply(ctx, this.baseTransform);
+      ctx.transform.apply(ctx, this.matrix);
+      this.scaleToContext();
+
+      return ctx.createPattern(temporaryPatternCanvas, 'repeat');
+    }
+  };
+
+  return TilingPattern;
+})();