96ba3aa2fa
Review URL: https://codereview.chromium.org/20662003 git-svn-id: http://skia.googlecode.com/svn/trunk@10404 2bbb7eff-a529-9590-31e7-b0007b416f81
376 lines
16 KiB
C++
376 lines
16 KiB
C++
#ifndef __DEFINED__SkPdfBasics
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#define __DEFINED__SkPdfBasics
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#include "SkCanvas.h"
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#include "SkPaint.h"
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#include "SkPdfConfig.h"
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#include <iostream>
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#include <cstdio>
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#include <map>
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#include <stack>
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class SkPdfFont;
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class SkPdfDoc;
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class SkPdfObject;
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class SkPdfResourceDictionary;
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class SkNativeParsedPDF;
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class SkPdfAllocator;
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// TODO(edisonn): better class design.
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struct SkPdfColorOperator {
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/*
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color space name or array The current color space in which color values are to be interpreted
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(see Section 4.5, “Color Spaces”). There are two separate color space
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parameters: one for stroking and one for all other painting opera-
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tions. Initial value: DeviceGray.
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*/
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// TODO(edisonn): implement the array part too
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// does not own the char*
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NotOwnedString fColorSpace;
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/*
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color (various) The current color to be used during painting operations (see Section
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4.5, “Color Spaces”). The type and interpretation of this parameter
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depend on the current color space; for most color spaces, a color
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value consists of one to four numbers. There are two separate color
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parameters: one for stroking and one for all other painting opera-
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tions. Initial value: black.
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*/
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SkColor fColor;
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double fOpacity; // ca or CA
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// TODO(edisonn): add here other color space options.
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void setRGBColor(SkColor color) {
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// TODO(edisonn): ASSERT DeviceRGB is the color space.
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fColor = color;
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}
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// TODO(edisonn): double check the default values for all fields.
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SkPdfColorOperator() : fColor(SK_ColorBLACK), fOpacity(1) {
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NotOwnedString::init(&fColorSpace);
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}
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void applyGraphicsState(SkPaint* paint) {
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paint->setColor(SkColorSetA(fColor, (U8CPU)(fOpacity * 255)));
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}
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};
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// TODO(edisonn): better class design.
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struct SkPdfGraphicsState {
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// TODO(edisonn): deprecate and remove these!
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double fCurPosX;
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double fCurPosY;
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double fCurFontSize;
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bool fTextBlock;
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SkPdfFont* fSkFont;
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SkPath fPath;
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bool fPathClosed;
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double fTextLeading;
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double fWordSpace;
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double fCharSpace;
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SkPdfResourceDictionary* fResources;
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// TODO(edisonn): move most of these in canvas/paint?
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// we could have some in canvas (matrixes?),
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// some in 2 paints (stroking paint and non stroking paint)
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// TABLE 4.2 Device-independent graphics state parameters
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/*
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* CTM array The current transformation matrix, which maps positions from user
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coordinates to device coordinates (see Section 4.2, “Coordinate Sys-
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tems”). This matrix is modified by each application of the coordi-
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nate transformation operator, cm. Initial value: a matrix that
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transforms default user coordinates to device coordinates.
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*/
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SkMatrix fCTM;
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/*
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clipping path (internal) The current clipping path, which defines the boundary against
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which all output is to be cropped (see Section 4.4.3, “Clipping Path
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Operators”). Initial value: the boundary of the entire imageable
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portion of the output page.
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*/
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// Clip that is applied after the drawing is done!!!
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bool fHasClipPathToApply;
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SkPath fClipPath;
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SkPdfColorOperator fStroking;
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SkPdfColorOperator fNonStroking;
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/*
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text state (various) A set of nine graphics state parameters that pertain only to the
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painting of text. These include parameters that select the font, scale
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the glyphs to an appropriate size, and accomplish other effects. The
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text state parameters are described in Section 5.2, “Text State
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Parameters and Operators.”
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*/
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// TODO(edisonn): add SkPdfTextState class. remove these two existing fields
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SkMatrix fMatrixTm;
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SkMatrix fMatrixTlm;
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/*
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line width number The thickness, in user space units, of paths to be stroked (see “Line
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Width” on page 152). Initial value: 1.0.
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*/
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double fLineWidth;
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/*
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line cap integer A code specifying the shape of the endpoints for any open path that
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is stroked (see “Line Cap Style” on page 153). Initial value: 0, for
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square butt caps.
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*/
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// TODO (edisonn): implement defaults - page 153
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int fLineCap;
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/*
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line join integer A code specifying the shape of joints between connected segments
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of a stroked path (see “Line Join Style” on page 153). Initial value: 0,
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for mitered joins.
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*/
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// TODO (edisonn): implement defaults - page 153
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int fLineJoin;
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/*
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miter limit number The maximum length of mitered line joins for stroked paths (see
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“Miter Limit” on page 153). This parameter limits the length of
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“spikes” produced when line segments join at sharp angles. Initial
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value: 10.0, for a miter cutoff below approximately 11.5 degrees.
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*/
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// TODO (edisonn): implement defaults - page 153
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double fMiterLimit;
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/*
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dash pattern array and A description of the dash pattern to be used when paths are
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number stroked (see “Line Dash Pattern” on page 155). Initial value: a solid
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line.
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*/
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SkScalar fDashArray[256]; // TODO(edisonn): allocate array?
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int fDashArrayLength;
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SkScalar fDashPhase;
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/*
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rendering intent name The rendering intent to be used when converting CIE-based colors
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to device colors (see “Rendering Intents” on page 197). Default
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value: RelativeColorimetric.
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*/
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// TODO(edisonn): seems paper only. Verify.
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/*
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stroke adjustment boolean (PDF 1.2) A flag specifying whether to compensate for possible ras-
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terization effects when stroking a path with a line width that is
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small relative to the pixel resolution of the output device (see Sec-
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tion 6.5.4, “Automatic Stroke Adjustment”). Note that this is con-
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sidered a device-independent parameter, even though the details of
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its effects are device-dependent. Initial value: false.
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*/
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// TODO(edisonn): stroke adjustment low priority.
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/*
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blend mode name or array (PDF 1.4) The current blend mode to be used in the transparent
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imaging model (see Sections 7.2.4, “Blend Mode,” and 7.5.2, “Spec-
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ifying Blending Color Space and Blend Mode”). This parameter is
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implicitly reset to its initial value at the beginning of execution of a
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transparency group XObject (see Section 7.5.5, “Transparency
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Group XObjects”). Initial value: Normal.
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*/
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SkXfermode::Mode fBlendMode;
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/*
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soft mask dictionary (PDF 1.4) A soft-mask dictionary (see “Soft-Mask Dictionaries” on
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or name page 445) specifying the mask shape or mask opacity values to be
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used in the transparent imaging model (see “Source Shape and
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Opacity” on page 421 and “Mask Shape and Opacity” on page 443),
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or the name None if no such mask is specified. This parameter is
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implicitly reset to its initial value at the beginning of execution of a
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transparency group XObject (see Section 7.5.5, “Transparency
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Group XObjects”). Initial value: None.
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*/
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SkBitmap fSMask;
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/*
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alpha constant number (PDF 1.4) The constant shape or constant opacity value to be used
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in the transparent imaging model (see “Source Shape and Opacity”
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on page 421 and “Constant Shape and Opacity” on page 444).
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There are two separate alpha constant parameters: one for stroking
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and one for all other painting operations. This parameter is implic-
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itly reset to its initial value at the beginning of execution of a trans-
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parency group XObject (see Section 7.5.5, “Transparency Group
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XObjects”). Initial value: 1.0.
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*/
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double fAphaConstant;
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/*
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alpha source boolean (PDF 1.4) A flag specifying whether the current soft mask and alpha
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constant parameters are to be interpreted as shape values (true) or
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opacity values (false). This flag also governs the interpretation of
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the SMask entry, if any, in an image dictionary (see Section 4.8.4,
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“Image Dictionaries”). Initial value: false.
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*/
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bool fAlphaSource;
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// TODO(edisonn): Device-dependent seem to be required only on the actual physical printer?
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// TABLE 4.3 Device-dependent graphics state parameters
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/*
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overprint boolean (PDF 1.2) A flag specifying (on output devices that support the
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overprint control feature) whether painting in one set of colorants
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should cause the corresponding areas of other colorants to be
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erased (false) or left unchanged (true); see Section 4.5.6, “Over-
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print Control.” In PDF 1.3, there are two separate overprint param-
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eters: one for stroking and one for all other painting operations.
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Initial value: false.
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*/
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/*
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overprint mode number (PDF 1.3) A code specifying whether a color component value of 0
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in a DeviceCMYK color space should erase that component (0) or
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leave it unchanged (1) when overprinting (see Section 4.5.6, “Over-
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print Control”). Initial value: 0.
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*/
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/*
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black generation function (PDF 1.2) A function that calculates the level of the black color
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or name component to use when converting RGB colors to CMYK (see Sec-
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tion 6.2.3, “Conversion from DeviceRGB to DeviceCMYK”). Initial
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value: installation-dependent.
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*/
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/*
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undercolor removal function (PDF 1.2) A function that calculates the reduction in the levels of
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or name the cyan, magenta, and yellow color components to compensate for
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the amount of black added by black generation (see Section 6.2.3,
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“Conversion from DeviceRGB to DeviceCMYK”). Initial value: in-
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stallation-dependent.
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*/
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/*
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transfer function, (PDF 1.2) A function that adjusts device gray or color component
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array, or name levels to compensate for nonlinear response in a particular out-
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put device (see Section 6.3, “Transfer Functions”). Initial value:
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installation-dependent.
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*/
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/*
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halftone dictionary, (PDF 1.2) A halftone screen for gray and color rendering, specified
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stream, or name as a halftone dictionary or stream (see Section 6.4, “Halftones”).
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Initial value: installation-dependent.
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*/
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/*
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flatness number The precision with which curves are to be rendered on the output
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device (see Section 6.5.1, “Flatness Tolerance”). The value of this
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parameter gives the maximum error tolerance, measured in output
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device pixels; smaller numbers give smoother curves at the expense
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of more computation and memory use. Initial value: 1.0.
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*/
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/*
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smoothness number (PDF 1.3) The precision with which color gradients are to be ren-
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dered on the output device (see Section 6.5.2, “Smoothness Toler-
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ance”). The value of this parameter gives the maximum error
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tolerance, expressed as a fraction of the range of each color compo-
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nent; smaller numbers give smoother color transitions at the
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expense of more computation and memory use. Initial value:
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installation-dependent.
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*/
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SkPdfGraphicsState() {
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fCurPosX = 0.0;
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fCurPosY = 0.0;
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fCurFontSize = 0.0;
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fTextBlock = false;
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fCTM = SkMatrix::I();
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fMatrixTm = SkMatrix::I();
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fMatrixTlm = SkMatrix::I();
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fPathClosed = true;
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fLineWidth = 0;
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fTextLeading = 0;
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fWordSpace = 0;
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fCharSpace = 0;
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fHasClipPathToApply = false;
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fResources = NULL;
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fSkFont = NULL;
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fLineCap = 0;
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fLineJoin = 0;
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fMiterLimit = 10.0;
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fAphaConstant = 1.0;
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fAlphaSource = false;
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fDashArrayLength = 0;
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fDashPhase = 0;
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fBlendMode = SkXfermode::kSrc_Mode; // PDF: Normal Blend mode
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}
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// TODO(edisonn): make two functons instead, stroking and non stoking, avoid branching
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void applyGraphicsState(SkPaint* paint, bool stroking);
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};
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// TODO(edisonn): better class design.
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// TODO(edisonn): could we remove it?
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// TODO(edisonn): rename to SkPdfInlineImage
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struct SkPdfInlineImage {
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std::map<std::string, std::string> fKeyValuePairs;
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std::string fImageData;
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};
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// TODO(edisonn): better class design.
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// TODO(edisonn): rename to SkPdfContext
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struct PdfContext {
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std::stack<SkPdfObject*> fObjectStack;
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std::stack<SkPdfGraphicsState> fStateStack;
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SkPdfGraphicsState fGraphicsState;
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SkNativeParsedPDF* fPdfDoc;
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// TODO(edisonn): the allocator, could be freed after the page is done drawing.
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SkPdfAllocator* fTmpPageAllocator;
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SkMatrix fOriginalMatrix;
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SkPdfInlineImage fInlineImage;
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PdfContext(SkNativeParsedPDF* doc);
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~PdfContext();
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};
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// TODO(edisonn): temporary code, to report how much of the PDF we actually think we rendered.
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// TODO(edisonn): rename to SkPdfResult
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enum PdfResult {
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kOK_PdfResult,
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kPartial_PdfResult,
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kNYI_PdfResult,
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kIgnoreError_PdfResult,
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kError_PdfResult,
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kUnsupported_PdfResult,
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kCount_PdfResult
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};
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#endif // __DEFINED__SkPdfBasics
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