/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkPDFShader.h"
#include "SkCanvas.h"
#include "SkData.h"
#include "SkPDFCatalog.h"
#include "SkPDFDevice.h"
#include "SkPDFTypes.h"
#include "SkPDFUtils.h"
#include "SkScalar.h"
#include "SkStream.h"
#include "SkTemplates.h"
#include "SkThread.h"
#include "SkTypes.h"
static bool transformBBox(const SkMatrix& matrix, SkRect* bbox) {
SkMatrix inverse;
if (!matrix.invert(&inverse)) {
return false;
}
inverse.mapRect(bbox);
return true;
}
static void unitToPointsMatrix(const SkPoint pts[2], SkMatrix* matrix) {
SkVector vec = pts[1] - pts[0];
SkScalar mag = vec.length();
SkScalar inv = mag ? SkScalarInvert(mag) : 0;
vec.scale(inv);
matrix->setSinCos(vec.fY, vec.fX);
matrix->preTranslate(pts[0].fX, pts[0].fY);
matrix->preScale(mag, mag);
}
/* Assumes t + startOffset is on the stack and does a linear interpolation on t
between startOffset and endOffset from prevColor to curColor (for each color
component), leaving the result in component order on the stack.
@param range endOffset - startOffset
@param curColor[components] The current color components.
@param prevColor[components] The previous color components.
@param result The result ps function.
*/
static void interpolateColorCode(SkScalar range, SkScalar* curColor,
SkScalar* prevColor, int components,
SkString* result) {
// Figure out how to scale each color component.
SkAutoSTMalloc<4, SkScalar> multiplierAlloc(components);
SkScalar *multiplier = multiplierAlloc.get();
for (int i = 0; i < components; i++) {
multiplier[i] = SkScalarDiv(curColor[i] - prevColor[i], range);
}
// Calculate when we no longer need to keep a copy of the input parameter t.
// If the last component to use t is i, then dupInput[0..i - 1] = true
// and dupInput[i .. components] = false.
SkAutoSTMalloc<4, bool> dupInputAlloc(components);
bool *dupInput = dupInputAlloc.get();
dupInput[components - 1] = false;
for (int i = components - 2; i >= 0; i--) {
dupInput[i] = dupInput[i + 1] || multiplier[i + 1] != 0;
}
if (!dupInput[0] && multiplier[0] == 0) {
result->append("pop ");
}
for (int i = 0; i < components; i++) {
// If the next components needs t and this component will consume a
// copy, make another copy.
if (dupInput[i] && multiplier[i] != 0) {
result->append("dup ");
}
if (multiplier[i] == 0) {
result->appendScalar(prevColor[i]);
result->append(" ");
} else {
if (multiplier[i] != 1) {
result->appendScalar(multiplier[i]);
result->append(" mul ");
}
if (prevColor[i] != 0) {
result->appendScalar(prevColor[i]);
result->append(" add ");
}
}
if (dupInput[i]) {
result->append("exch\n");
}
}
}
/* Generate Type 4 function code to map t=[0,1) to the passed gradient,
clamping at the edges of the range. The generated code will be of the form:
if (t < 0) {
return colorData[0][r,g,b];
} else {
if (t < info.fColorOffsets[1]) {
return linearinterpolation(colorData[0][r,g,b],
colorData[1][r,g,b]);
} else {
if (t < info.fColorOffsets[2]) {
return linearinterpolation(colorData[1][r,g,b],
colorData[2][r,g,b]);
} else {
... } else {
return colorData[info.fColorCount - 1][r,g,b];
}
...
}
}
*/
static void gradientFunctionCode(const SkShader::GradientInfo& info,
SkString* result) {
/* We want to linearly interpolate from the previous color to the next.
Scale the colors from 0..255 to 0..1 and determine the multipliers
for interpolation.
C{r,g,b}(t, section) = t - offset_(section-1) + t * Multiplier{r,g,b}.
*/
static const int kColorComponents = 3;
typedef SkScalar ColorTuple[kColorComponents];
SkAutoSTMalloc<4, ColorTuple> colorDataAlloc(info.fColorCount);
ColorTuple *colorData = colorDataAlloc.get();
const SkScalar scale = SkScalarInvert(SkIntToScalar(255));
for (int i = 0; i < info.fColorCount; i++) {
colorData[i][0] = SkScalarMul(SkColorGetR(info.fColors[i]), scale);
colorData[i][1] = SkScalarMul(SkColorGetG(info.fColors[i]), scale);
colorData[i][2] = SkScalarMul(SkColorGetB(info.fColors[i]), scale);
}
// Clamp the initial color.
result->append("dup 0 le {pop ");
result->appendScalar(colorData[0][0]);
result->append(" ");
result->appendScalar(colorData[0][1]);
result->append(" ");
result->appendScalar(colorData[0][2]);
result->append(" }\n");
// The gradient colors.
for (int i = 1 ; i < info.fColorCount; i++) {
result->append("{dup ");
result->appendScalar(info.fColorOffsets[i]);
result->append(" le {");
if (info.fColorOffsets[i - 1] != 0) {
result->appendScalar(info.fColorOffsets[i - 1]);
result->append(" sub\n");
}
interpolateColorCode(info.fColorOffsets[i] - info.fColorOffsets[i - 1],
colorData[i], colorData[i - 1], kColorComponents,
result);
result->append("}\n");
}
// Clamp the final color.
result->append("{pop ");
result->appendScalar(colorData[info.fColorCount - 1][0]);
result->append(" ");
result->appendScalar(colorData[info.fColorCount - 1][1]);
result->append(" ");
result->appendScalar(colorData[info.fColorCount - 1][2]);
for (int i = 0 ; i < info.fColorCount; i++) {
result->append("} ifelse\n");
}
}
/* Map a value of t on the stack into [0, 1) for Repeat or Mirror tile mode. */
static void tileModeCode(SkShader::TileMode mode, SkString* result) {
if (mode == SkShader::kRepeat_TileMode) {
result->append("dup truncate sub\n"); // Get the fractional part.
result->append("dup 0 le {1 add} if\n"); // Map (-1,0) => (0,1)
return;
}
if (mode == SkShader::kMirror_TileMode) {
// Map t mod 2 into [0, 1, 1, 0].
// Code Stack
result->append("abs " // Map negative to positive.
"dup " // t.s t.s
"truncate " // t.s t
"dup " // t.s t t
"cvi " // t.s t T
"2 mod " // t.s t (i mod 2)
"1 eq " // t.s t true|false
"3 1 roll " // true|false t.s t
"sub " // true|false 0.s
"exch " // 0.s true|false
"{1 exch sub} if\n"); // 1 - 0.s|0.s
}
}
static SkString linearCode(const SkShader::GradientInfo& info) {
SkString function("{pop\n"); // Just ditch the y value.
tileModeCode(info.fTileMode, &function);
gradientFunctionCode(info, &function);
function.append("}");
return function;
}
static SkString radialCode(const SkShader::GradientInfo& info) {
SkString function("{");
// Find the distance from the origin.
function.append("dup " // x y y
"mul " // x y^2
"exch " // y^2 x
"dup " // y^2 x x
"mul " // y^2 x^2
"add " // y^2+x^2
"sqrt\n"); // sqrt(y^2+x^2)
tileModeCode(info.fTileMode, &function);
gradientFunctionCode(info, &function);
function.append("}");
return function;
}
/* The math here is all based on the description in Two_Point_Radial_Gradient,
with one simplification, the coordinate space has been scaled so that
Dr = 1. This means we don't need to scale the entire equation by 1/Dr^2.
*/
static SkString twoPointRadialCode(const SkShader::GradientInfo& info) {
SkScalar dx = info.fPoint[0].fX - info.fPoint[1].fX;
SkScalar dy = info.fPoint[0].fY - info.fPoint[1].fY;
SkScalar sr = info.fRadius[0];
SkScalar a = SkScalarMul(dx, dx) + SkScalarMul(dy, dy) - SK_Scalar1;
bool posRoot = info.fRadius[1] > info.fRadius[0];
// We start with a stack of (x y), copy it and then consume one copy in
// order to calculate b and the other to calculate c.
SkString function("{");
function.append("2 copy ");
// Calculate -b and b^2.
function.appendScalar(dy);
function.append(" mul exch ");
function.appendScalar(dx);
function.append(" mul add ");
function.appendScalar(sr);
function.append(" sub 2 mul neg dup dup mul\n");
// Calculate c
function.append("4 2 roll dup mul exch dup mul add ");
function.appendScalar(SkScalarMul(sr, sr));
function.append(" sub\n");
// Calculate the determinate
function.appendScalar(SkScalarMul(SkIntToScalar(4), a));
function.append(" mul sub abs sqrt\n");
// And then the final value of t.
if (posRoot) {
function.append("sub ");
} else {
function.append("add ");
}
function.appendScalar(SkScalarMul(SkIntToScalar(2), a));
function.append(" div\n");
tileModeCode(info.fTileMode, &function);
gradientFunctionCode(info, &function);
function.append("}");
return function;
}
/* Conical gradient shader, based on the Canvas spec for radial gradients
See: http://www.w3.org/TR/2dcontext/#dom-context-2d-createradialgradient
*/
static SkString twoPointConicalCode(const SkShader::GradientInfo& info) {
SkScalar dx = info.fPoint[1].fX - info.fPoint[0].fX;
SkScalar dy = info.fPoint[1].fY - info.fPoint[0].fY;
SkScalar r0 = info.fRadius[0];
SkScalar dr = info.fRadius[1] - info.fRadius[0];
SkScalar a = SkScalarMul(dx, dx) + SkScalarMul(dy, dy) -
SkScalarMul(dr, dr);
// First compute t, if the pixel falls outside the cone, then we'll end
// with 'false' on the stack, otherwise we'll push 'true' with t below it
// We start with a stack of (x y), copy it and then consume one copy in
// order to calculate b and the other to calculate c.
SkString function("{");
function.append("2 copy ");
// Calculate b and b^2; b = -2 * (y * dy + x * dx + r0 * dr).
function.appendScalar(dy);
function.append(" mul exch ");
function.appendScalar(dx);
function.append(" mul add ");
function.appendScalar(SkScalarMul(r0, dr));
function.append(" add -2 mul dup dup mul\n");
// c = x^2 + y^2 + radius0^2
function.append("4 2 roll dup mul exch dup mul add ");
function.appendScalar(SkScalarMul(r0, r0));
function.append(" sub dup 4 1 roll\n");
// Contents of the stack at this point: c, b, b^2, c
// if a = 0, then we collapse to a simpler linear case
if (a == 0) {
// t = -c/b
function.append("pop pop div neg dup ");
// compute radius(t)
function.appendScalar(dr);
function.append(" mul ");
function.appendScalar(r0);
function.append(" add\n");
// if r(t) < 0, then it's outside the cone
function.append("0 lt {pop false} {true} ifelse\n");
} else {
// quadratic case: the Canvas spec wants the largest
// root t for which radius(t) > 0
// compute the discriminant (b^2 - 4ac)
function.appendScalar(SkScalarMul(SkIntToScalar(4), a));
function.append(" mul sub dup\n");
// if d >= 0, proceed
function.append("0 ge {\n");
// an intermediate value we'll use to compute the roots:
// q = -0.5 * (b +/- sqrt(d))
function.append("sqrt exch dup 0 lt {exch -1 mul} if");
function.append(" add -0.5 mul dup\n");
// first root = q / a
function.appendScalar(a);
function.append(" div\n");
// second root = c / q
function.append("3 1 roll div\n");
// put the larger root on top of the stack
function.append("2 copy gt {exch} if\n");
// compute radius(t) for larger root
function.append("dup ");
function.appendScalar(dr);
function.append(" mul ");
function.appendScalar(r0);
function.append(" add\n");
// if r(t) > 0, we have our t, pop off the smaller root and we're done
function.append(" 0 gt {exch pop true}\n");
// otherwise, throw out the larger one and try the smaller root
function.append("{pop dup\n");
function.appendScalar(dr);
function.append(" mul ");
function.appendScalar(r0);
function.append(" add\n");
// if r(t) < 0, push false, otherwise the smaller root is our t
function.append("0 le {pop false} {true} ifelse\n");
function.append("} ifelse\n");
// d < 0, clear the stack and push false
function.append("} {pop pop pop false} ifelse\n");
}
// if the pixel is in the cone, proceed to compute a color
function.append("{");
tileModeCode(info.fTileMode, &function);
gradientFunctionCode(info, &function);
// otherwise, just write black
function.append("} {0 0 0} ifelse }");
return function;
}
static SkString sweepCode(const SkShader::GradientInfo& info) {
SkString function("{exch atan 360 div\n");
tileModeCode(info.fTileMode, &function);
gradientFunctionCode(info, &function);
function.append("}");
return function;
}
class SkPDFShader::State {
public:
SkShader::GradientType fType;
SkShader::GradientInfo fInfo;
SkAutoFree fColorData;
SkMatrix fCanvasTransform;
SkMatrix fShaderTransform;
SkIRect fBBox;
SkBitmap fImage;
uint32_t fPixelGeneration;
SkShader::TileMode fImageTileModes[2];
explicit State(const SkShader& shader, const SkMatrix& canvasTransform,
const SkIRect& bbox);
bool operator==(const State& b) const;
};
class SkPDFFunctionShader : public SkPDFDict, public SkPDFShader {
public:
explicit SkPDFFunctionShader(SkPDFShader::State* state);
virtual ~SkPDFFunctionShader() {
if (isValid()) {
RemoveShader(this);
}
fResources.unrefAll();
}
virtual bool isValid() { return fResources.count() > 0; }
void getResources(SkTDArray<SkPDFObject*>* resourceList) {
GetResourcesHelper(&fResources, resourceList);
}
private:
static SkPDFObject* RangeObject();
SkTDArray<SkPDFObject*> fResources;
SkAutoTDelete<const SkPDFShader::State> fState;
SkPDFStream* makePSFunction(const SkString& psCode, SkPDFArray* domain);
};
class SkPDFImageShader : public SkPDFStream, public SkPDFShader {
public:
explicit SkPDFImageShader(SkPDFShader::State* state);
virtual ~SkPDFImageShader() {
RemoveShader(this);
fResources.unrefAll();
}
virtual bool isValid() { return size() > 0; }
void getResources(SkTDArray<SkPDFObject*>* resourceList) {
GetResourcesHelper(&fResources, resourceList);
}
private:
SkTDArray<SkPDFObject*> fResources;
SkAutoTDelete<const SkPDFShader::State> fState;
};
SkPDFShader::SkPDFShader() {}
// static
void SkPDFShader::RemoveShader(SkPDFObject* shader) {
SkAutoMutexAcquire lock(CanonicalShadersMutex());
ShaderCanonicalEntry entry(shader, NULL);
int index = CanonicalShaders().find(entry);
SkASSERT(index >= 0);
CanonicalShaders().removeShuffle(index);
}
// static
SkPDFObject* SkPDFShader::GetPDFShader(const SkShader& shader,
const SkMatrix& matrix,
const SkIRect& surfaceBBox) {
SkPDFObject* result;
SkAutoMutexAcquire lock(CanonicalShadersMutex());
SkAutoTDelete<State> shaderState(new State(shader, matrix, surfaceBBox));
if (shaderState.get()->fType == SkShader::kNone_GradientType &&
shaderState.get()->fImage.isNull()) {
// TODO(vandebo) This drops SKComposeShader on the floor. We could
// handle compose shader by pulling things up to a layer, drawing with
// the first shader, applying the xfer mode and drawing again with the
// second shader, then applying the layer to the original drawing.
return NULL;
}
ShaderCanonicalEntry entry(NULL, shaderState.get());
int index = CanonicalShaders().find(entry);
if (index >= 0) {
result = CanonicalShaders()[index].fPDFShader;
result->ref();
return result;
}
bool valid = false;
// The PDFShader takes ownership of the shaderSate.
if (shaderState.get()->fType == SkShader::kNone_GradientType) {
SkPDFImageShader* imageShader =
new SkPDFImageShader(shaderState.detach());
valid = imageShader->isValid();
result = imageShader;
} else {
SkPDFFunctionShader* functionShader =
new SkPDFFunctionShader(shaderState.detach());
valid = functionShader->isValid();
result = functionShader;
}
if (!valid) {
delete result;
return NULL;
}
entry.fPDFShader = result;
CanonicalShaders().push(entry);
return result; // return the reference that came from new.
}
// static
SkTDArray<SkPDFShader::ShaderCanonicalEntry>& SkPDFShader::CanonicalShaders() {
// This initialization is only thread safe with gcc.
static SkTDArray<ShaderCanonicalEntry> gCanonicalShaders;
return gCanonicalShaders;
}
// static
SkBaseMutex& SkPDFShader::CanonicalShadersMutex() {
// This initialization is only thread safe with gcc or when
// POD-style mutex initialization is used.
SK_DECLARE_STATIC_MUTEX(gCanonicalShadersMutex);
return gCanonicalShadersMutex;
}
// static
SkPDFObject* SkPDFFunctionShader::RangeObject() {
// This initialization is only thread safe with gcc.
static SkPDFArray* range = NULL;
// This method is only used with CanonicalShadersMutex, so it's safe to
// populate domain.
if (range == NULL) {
range = new SkPDFArray;
range->reserve(6);
range->appendInt(0);
range->appendInt(1);
range->appendInt(0);
range->appendInt(1);
range->appendInt(0);
range->appendInt(1);
}
return range;
}
SkPDFFunctionShader::SkPDFFunctionShader(SkPDFShader::State* state)
: SkPDFDict("Pattern"),
fState(state) {
SkString (*codeFunction)(const SkShader::GradientInfo& info) = NULL;
SkPoint transformPoints[2];
// Depending on the type of the gradient, we want to transform the
// coordinate space in different ways.
const SkShader::GradientInfo* info = &fState.get()->fInfo;
transformPoints[0] = info->fPoint[0];
transformPoints[1] = info->fPoint[1];
switch (fState.get()->fType) {
case SkShader::kLinear_GradientType:
codeFunction = &linearCode;
break;
case SkShader::kRadial_GradientType:
transformPoints[1] = transformPoints[0];
transformPoints[1].fX += info->fRadius[0];
codeFunction = &radialCode;
break;
case SkShader::kRadial2_GradientType: {
// Bail out if the radii are the same. Empty fResources signals
// an error and isValid will return false.
if (info->fRadius[0] == info->fRadius[1]) {
return;
}
transformPoints[1] = transformPoints[0];
SkScalar dr = info->fRadius[1] - info->fRadius[0];
transformPoints[1].fX += dr;
codeFunction = &twoPointRadialCode;
break;
}
case SkShader::kConical_GradientType: {
transformPoints[1] = transformPoints[0];
transformPoints[1].fX += SK_Scalar1;
codeFunction = &twoPointConicalCode;
break;
}
case SkShader::kSweep_GradientType:
transformPoints[1] = transformPoints[0];
transformPoints[1].fX += SK_Scalar1;
codeFunction = &sweepCode;
break;
case SkShader::kColor_GradientType:
case SkShader::kNone_GradientType:
default:
return;
}
// Move any scaling (assuming a unit gradient) or translation
// (and rotation for linear gradient), of the final gradient from
// info->fPoints to the matrix (updating bbox appropriately). Now
// the gradient can be drawn on on the unit segment.
SkMatrix mapperMatrix;
unitToPointsMatrix(transformPoints, &mapperMatrix);
SkMatrix finalMatrix = fState.get()->fCanvasTransform;
finalMatrix.preConcat(mapperMatrix);
finalMatrix.preConcat(fState.get()->fShaderTransform);
SkRect bbox;
bbox.set(fState.get()->fBBox);
if (!transformBBox(finalMatrix, &bbox)) {
return;
}
SkAutoTUnref<SkPDFArray> domain(new SkPDFArray);
domain->reserve(4);
domain->appendScalar(bbox.fLeft);
domain->appendScalar(bbox.fRight);
domain->appendScalar(bbox.fTop);
domain->appendScalar(bbox.fBottom);
SkString functionCode;
// The two point radial gradient further references fState.get()->fInfo
// in translating from x, y coordinates to the t parameter. So, we have
// to transform the points and radii according to the calculated matrix.
if (fState.get()->fType == SkShader::kRadial2_GradientType) {
SkShader::GradientInfo twoPointRadialInfo = *info;
SkMatrix inverseMapperMatrix;
if (!mapperMatrix.invert(&inverseMapperMatrix)) {
return;
}
inverseMapperMatrix.mapPoints(twoPointRadialInfo.fPoint, 2);
twoPointRadialInfo.fRadius[0] =
inverseMapperMatrix.mapRadius(info->fRadius[0]);
twoPointRadialInfo.fRadius[1] =
inverseMapperMatrix.mapRadius(info->fRadius[1]);
functionCode = codeFunction(twoPointRadialInfo);
} else {
functionCode = codeFunction(*info);
}
SkAutoTUnref<SkPDFDict> pdfShader(new SkPDFDict);
pdfShader->insertInt("ShadingType", 1);
pdfShader->insertName("ColorSpace", "DeviceRGB");
pdfShader->insert("Domain", domain.get());
SkPDFStream* function = makePSFunction(functionCode, domain.get());
pdfShader->insert("Function", new SkPDFObjRef(function))->unref();
fResources.push(function); // Pass ownership to resource list.
insertInt("PatternType", 2);
insert("Matrix", SkPDFUtils::MatrixToArray(finalMatrix))->unref();
insert("Shading", pdfShader.get());
}
SkPDFImageShader::SkPDFImageShader(SkPDFShader::State* state) : fState(state) {
fState.get()->fImage.lockPixels();
SkMatrix finalMatrix = fState.get()->fCanvasTransform;
finalMatrix.preConcat(fState.get()->fShaderTransform);
SkRect surfaceBBox;
surfaceBBox.set(fState.get()->fBBox);
if (!transformBBox(finalMatrix, &surfaceBBox)) {
return;
}
SkMatrix unflip;
unflip.setTranslate(0, SkScalarRoundToScalar(surfaceBBox.height()));
unflip.preScale(SK_Scalar1, -SK_Scalar1);
SkISize size = SkISize::Make(SkScalarRound(surfaceBBox.width()),
SkScalarRound(surfaceBBox.height()));
SkPDFDevice pattern(size, size, unflip);
SkCanvas canvas(&pattern);
canvas.translate(-surfaceBBox.fLeft, -surfaceBBox.fTop);
finalMatrix.preTranslate(surfaceBBox.fLeft, surfaceBBox.fTop);
const SkBitmap* image = &fState.get()->fImage;
SkScalar width = SkIntToScalar(image->width());
SkScalar height = SkIntToScalar(image->height());
SkShader::TileMode tileModes[2];
tileModes[0] = fState.get()->fImageTileModes[0];
tileModes[1] = fState.get()->fImageTileModes[1];
canvas.drawBitmap(*image, 0, 0);
SkRect patternBBox = SkRect::MakeXYWH(-surfaceBBox.fLeft, -surfaceBBox.fTop,
width, height);
// Tiling is implied. First we handle mirroring.
if (tileModes[0] == SkShader::kMirror_TileMode) {
SkMatrix xMirror;
xMirror.setScale(-1, 1);
xMirror.postTranslate(2 * width, 0);
canvas.drawBitmapMatrix(*image, xMirror);
patternBBox.fRight += width;
}
if (tileModes[1] == SkShader::kMirror_TileMode) {
SkMatrix yMirror;
yMirror.setScale(SK_Scalar1, -SK_Scalar1);
yMirror.postTranslate(0, 2 * height);
canvas.drawBitmapMatrix(*image, yMirror);
patternBBox.fBottom += height;
}
if (tileModes[0] == SkShader::kMirror_TileMode &&
tileModes[1] == SkShader::kMirror_TileMode) {
SkMatrix mirror;
mirror.setScale(-1, -1);
mirror.postTranslate(2 * width, 2 * height);
canvas.drawBitmapMatrix(*image, mirror);
}
// Then handle Clamping, which requires expanding the pattern canvas to
// cover the entire surfaceBBox.
// If both x and y are in clamp mode, we start by filling in the corners.
// (Which are just a rectangles of the corner colors.)
if (tileModes[0] == SkShader::kClamp_TileMode &&
tileModes[1] == SkShader::kClamp_TileMode) {
SkPaint paint;
SkRect rect;
rect = SkRect::MakeLTRB(surfaceBBox.fLeft, surfaceBBox.fTop, 0, 0);
if (!rect.isEmpty()) {
paint.setColor(image->getColor(0, 0));
canvas.drawRect(rect, paint);
}
rect = SkRect::MakeLTRB(width, surfaceBBox.fTop, surfaceBBox.fRight, 0);
if (!rect.isEmpty()) {
paint.setColor(image->getColor(image->width() - 1, 0));
canvas.drawRect(rect, paint);
}
rect = SkRect::MakeLTRB(width, height, surfaceBBox.fRight,
surfaceBBox.fBottom);
if (!rect.isEmpty()) {
paint.setColor(image->getColor(image->width() - 1,
image->height() - 1));
canvas.drawRect(rect, paint);
}
rect = SkRect::MakeLTRB(surfaceBBox.fLeft, height, 0,
surfaceBBox.fBottom);
if (!rect.isEmpty()) {
paint.setColor(image->getColor(0, image->height() - 1));
canvas.drawRect(rect, paint);
}
}
// Then expand the left, right, top, then bottom.
if (tileModes[0] == SkShader::kClamp_TileMode) {
SkIRect subset = SkIRect::MakeXYWH(0, 0, 1, image->height());
if (surfaceBBox.fLeft < 0) {
SkBitmap left;
SkAssertResult(image->extractSubset(&left, subset));
SkMatrix leftMatrix;
leftMatrix.setScale(-surfaceBBox.fLeft, 1);
leftMatrix.postTranslate(surfaceBBox.fLeft, 0);
canvas.drawBitmapMatrix(left, leftMatrix);
if (tileModes[1] == SkShader::kMirror_TileMode) {
leftMatrix.postScale(SK_Scalar1, -SK_Scalar1);
leftMatrix.postTranslate(0, 2 * height);
canvas.drawBitmapMatrix(left, leftMatrix);
}
patternBBox.fLeft = 0;
}
if (surfaceBBox.fRight > width) {
SkBitmap right;
subset.offset(image->width() - 1, 0);
SkAssertResult(image->extractSubset(&right, subset));
SkMatrix rightMatrix;
rightMatrix.setScale(surfaceBBox.fRight - width, 1);
rightMatrix.postTranslate(width, 0);
canvas.drawBitmapMatrix(right, rightMatrix);
if (tileModes[1] == SkShader::kMirror_TileMode) {
rightMatrix.postScale(SK_Scalar1, -SK_Scalar1);
rightMatrix.postTranslate(0, 2 * height);
canvas.drawBitmapMatrix(right, rightMatrix);
}
patternBBox.fRight = surfaceBBox.width();
}
}
if (tileModes[1] == SkShader::kClamp_TileMode) {
SkIRect subset = SkIRect::MakeXYWH(0, 0, image->width(), 1);
if (surfaceBBox.fTop < 0) {
SkBitmap top;
SkAssertResult(image->extractSubset(&top, subset));
SkMatrix topMatrix;
topMatrix.setScale(SK_Scalar1, -surfaceBBox.fTop);
topMatrix.postTranslate(0, surfaceBBox.fTop);
canvas.drawBitmapMatrix(top, topMatrix);
if (tileModes[0] == SkShader::kMirror_TileMode) {
topMatrix.postScale(-1, 1);
topMatrix.postTranslate(2 * width, 0);
canvas.drawBitmapMatrix(top, topMatrix);
}
patternBBox.fTop = 0;
}
if (surfaceBBox.fBottom > height) {
SkBitmap bottom;
subset.offset(0, image->height() - 1);
SkAssertResult(image->extractSubset(&bottom, subset));
SkMatrix bottomMatrix;
bottomMatrix.setScale(SK_Scalar1, surfaceBBox.fBottom - height);
bottomMatrix.postTranslate(0, height);
canvas.drawBitmapMatrix(bottom, bottomMatrix);
if (tileModes[0] == SkShader::kMirror_TileMode) {
bottomMatrix.postScale(-1, 1);
bottomMatrix.postTranslate(2 * width, 0);
canvas.drawBitmapMatrix(bottom, bottomMatrix);
}
patternBBox.fBottom = surfaceBBox.height();
}
}
SkAutoTUnref<SkPDFArray> patternBBoxArray(new SkPDFArray);
patternBBoxArray->reserve(4);
patternBBoxArray->appendScalar(patternBBox.fLeft);
patternBBoxArray->appendScalar(patternBBox.fTop);
patternBBoxArray->appendScalar(patternBBox.fRight);
patternBBoxArray->appendScalar(patternBBox.fBottom);
// Put the canvas into the pattern stream (fContent).
SkAutoTUnref<SkStream> content(pattern.content());
setData(content.get());
pattern.getResources(&fResources, false);
insertName("Type", "Pattern");
insertInt("PatternType", 1);
insertInt("PaintType", 1);
insertInt("TilingType", 1);
insert("BBox", patternBBoxArray.get());
insertScalar("XStep", patternBBox.width());
insertScalar("YStep", patternBBox.height());
insert("Resources", pattern.getResourceDict());
insert("Matrix", SkPDFUtils::MatrixToArray(finalMatrix))->unref();
fState.get()->fImage.unlockPixels();
}
SkPDFStream* SkPDFFunctionShader::makePSFunction(const SkString& psCode,
SkPDFArray* domain) {
SkAutoDataUnref funcData(SkData::NewWithCopy(psCode.c_str(),
psCode.size()));
SkPDFStream* result = new SkPDFStream(funcData.get());
result->insertInt("FunctionType", 4);
result->insert("Domain", domain);
result->insert("Range", RangeObject());
return result;
}
SkPDFShader::ShaderCanonicalEntry::ShaderCanonicalEntry(SkPDFObject* pdfShader,
const State* state)
: fPDFShader(pdfShader),
fState(state) {
}
bool SkPDFShader::ShaderCanonicalEntry::operator==(
const ShaderCanonicalEntry& b) const {
return fPDFShader == b.fPDFShader ||
(fState != NULL && b.fState != NULL && *fState == *b.fState);
}
bool SkPDFShader::State::operator==(const SkPDFShader::State& b) const {
if (fType != b.fType ||
fCanvasTransform != b.fCanvasTransform ||
fShaderTransform != b.fShaderTransform ||
fBBox != b.fBBox) {
return false;
}
if (fType == SkShader::kNone_GradientType) {
if (fPixelGeneration != b.fPixelGeneration ||
fPixelGeneration == 0 ||
fImageTileModes[0] != b.fImageTileModes[0] ||
fImageTileModes[1] != b.fImageTileModes[1]) {
return false;
}
} else {
if (fInfo.fColorCount != b.fInfo.fColorCount ||
memcmp(fInfo.fColors, b.fInfo.fColors,
sizeof(SkColor) * fInfo.fColorCount) != 0 ||
memcmp(fInfo.fColorOffsets, b.fInfo.fColorOffsets,
sizeof(SkScalar) * fInfo.fColorCount) != 0 ||
fInfo.fPoint[0] != b.fInfo.fPoint[0] ||
fInfo.fTileMode != b.fInfo.fTileMode) {
return false;
}
switch (fType) {
case SkShader::kLinear_GradientType:
if (fInfo.fPoint[1] != b.fInfo.fPoint[1]) {
return false;
}
break;
case SkShader::kRadial_GradientType:
if (fInfo.fRadius[0] != b.fInfo.fRadius[0]) {
return false;
}
break;
case SkShader::kRadial2_GradientType:
case SkShader::kConical_GradientType:
if (fInfo.fPoint[1] != b.fInfo.fPoint[1] ||
fInfo.fRadius[0] != b.fInfo.fRadius[0] ||
fInfo.fRadius[1] != b.fInfo.fRadius[1]) {
return false;
}
break;
case SkShader::kSweep_GradientType:
case SkShader::kNone_GradientType:
case SkShader::kColor_GradientType:
break;
}
}
return true;
}
SkPDFShader::State::State(const SkShader& shader,
const SkMatrix& canvasTransform, const SkIRect& bbox)
: fCanvasTransform(canvasTransform),
fBBox(bbox),
fPixelGeneration(0) {
fInfo.fColorCount = 0;
fInfo.fColors = NULL;
fInfo.fColorOffsets = NULL;
fShaderTransform = shader.getLocalMatrix();
fImageTileModes[0] = fImageTileModes[1] = SkShader::kClamp_TileMode;
fType = shader.asAGradient(&fInfo);
if (fType == SkShader::kNone_GradientType) {
SkShader::BitmapType bitmapType;
SkMatrix matrix;
bitmapType = shader.asABitmap(&fImage, &matrix, fImageTileModes);
if (bitmapType != SkShader::kDefault_BitmapType) {
fImage.reset();
return;
}
SkASSERT(matrix.isIdentity());
fPixelGeneration = fImage.getGenerationID();
} else {
fColorData.set(sk_malloc_throw(
fInfo.fColorCount * (sizeof(SkColor) + sizeof(SkScalar))));
fInfo.fColors = reinterpret_cast<SkColor*>(fColorData.get());
fInfo.fColorOffsets =
reinterpret_cast<SkScalar*>(fInfo.fColors + fInfo.fColorCount);
shader.asAGradient(&fInfo);
}
}