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      1 
      2 /*
      3  * Copyright 2006 The Android Open Source Project
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 
      9 
     10 #include "SkDrawGradient.h"
     11 #include "SkAnimateMaker.h"
     12 #include "SkAnimatorScript.h"
     13 #include "SkGradientShader.h"
     14 
     15 #if SK_USE_CONDENSED_INFO == 0
     16 
     17 const SkMemberInfo SkDrawGradient::fInfo[] = {
     18     SK_MEMBER_INHERITED,
     19     SK_MEMBER_ARRAY(offsets, Float),
     20     SK_MEMBER(unitMapper, String)
     21 };
     22 
     23 #endif
     24 
     25 DEFINE_GET_MEMBER(SkDrawGradient);
     26 
     27 SkDrawGradient::SkDrawGradient() {
     28 }
     29 
     30 SkDrawGradient::~SkDrawGradient() {
     31     for (int index = 0; index < fDrawColors.count(); index++)
     32         delete fDrawColors[index];
     33 }
     34 
     35 bool SkDrawGradient::addChild(SkAnimateMaker& , SkDisplayable* child) {
     36     SkASSERT(child);
     37     if (child->isColor()) {
     38         SkDrawColor* color = (SkDrawColor*) child;
     39         *fDrawColors.append() = color;
     40         return true;
     41     }
     42     return false;
     43 }
     44 
     45 int SkDrawGradient::addPrelude() {
     46     int count = fDrawColors.count();
     47     fColors.setCount(count);
     48     for (int index = 0; index < count; index++)
     49         fColors[index] = fDrawColors[index]->color;
     50     return count;
     51 }
     52 
     53 #ifdef SK_DUMP_ENABLED
     54 void SkDrawGradient::dumpRest(SkAnimateMaker* maker) {
     55     dumpAttrs(maker);
     56     //can a gradient have no colors?
     57     bool closedYet = false;
     58     SkDisplayList::fIndent += 4;
     59     for (SkDrawColor** ptr = fDrawColors.begin(); ptr < fDrawColors.end(); ptr++) {
     60         if (closedYet == false) {
     61             SkDebugf(">\n");
     62             closedYet = true;
     63         }
     64         SkDrawColor* color = *ptr;
     65         color->dump(maker);
     66     }
     67     SkDisplayList::fIndent -= 4;
     68     dumpChildren(maker, closedYet); //dumps the matrix if it has one
     69 }
     70 #endif
     71 
     72 void SkDrawGradient::onEndElement(SkAnimateMaker& maker) {
     73     if (offsets.count() != 0) {
     74         if (offsets.count() != fDrawColors.count()) {
     75             maker.setErrorCode(SkDisplayXMLParserError::kGradientOffsetsDontMatchColors);
     76             return;
     77         }
     78         if (offsets[0] != 0) {
     79             maker.setErrorCode(SkDisplayXMLParserError::kGradientOffsetsMustStartWithZero);
     80             return;
     81         }
     82         if (offsets[offsets.count()-1] != SK_Scalar1) {
     83             maker.setErrorCode(SkDisplayXMLParserError::kGradientOffsetsMustEndWithOne);
     84             return;
     85         }
     86         for (int i = 1; i < offsets.count(); i++) {
     87             if (offsets[i] <= offsets[i-1]) {
     88                 maker.setErrorCode(SkDisplayXMLParserError::kGradientOffsetsMustIncrease);
     89                 return;
     90             }
     91             if (offsets[i] > SK_Scalar1) {
     92                 maker.setErrorCode(SkDisplayXMLParserError::kGradientOffsetsMustBeNoMoreThanOne);
     93                 return;
     94             }
     95         }
     96     }
     97     INHERITED::onEndElement(maker);
     98 }
     99 
    100 #if SK_USE_CONDENSED_INFO == 0
    101 
    102 const SkMemberInfo SkDrawLinearGradient::fInfo[] = {
    103     SK_MEMBER_INHERITED,
    104     SK_MEMBER_ARRAY(points, Float),
    105 };
    106 
    107 #endif
    108 
    109 DEFINE_GET_MEMBER(SkDrawLinearGradient);
    110 
    111 SkDrawLinearGradient::SkDrawLinearGradient() {
    112 }
    113 
    114 void SkDrawLinearGradient::onEndElement(SkAnimateMaker& maker)
    115 {
    116     if (points.count() != 4)
    117         maker.setErrorCode(SkDisplayXMLParserError::kGradientPointsLengthMustBeFour);
    118     INHERITED::onEndElement(maker);
    119 }
    120 
    121 #ifdef SK_DUMP_ENABLED
    122 void SkDrawLinearGradient::dump(SkAnimateMaker* maker) {
    123     dumpBase(maker);
    124     dumpRest(maker);
    125     }
    126 #endif
    127 
    128 SkShader* SkDrawLinearGradient::getShader() {
    129     if (addPrelude() == 0 || points.count() != 4)
    130         return NULL;
    131     SkShader* shader = SkGradientShader::CreateLinear((SkPoint*)points.begin(),
    132         fColors.begin(), offsets.begin(), fColors.count(), (SkShader::TileMode) tileMode,
    133         0, getMatrix());
    134     SkAutoTDelete<SkShader> autoDel(shader);
    135     (void)autoDel.detach();
    136     return shader;
    137 }
    138 
    139 
    140 #if SK_USE_CONDENSED_INFO == 0
    141 
    142 const SkMemberInfo SkDrawRadialGradient::fInfo[] = {
    143     SK_MEMBER_INHERITED,
    144     SK_MEMBER(center, Point),
    145     SK_MEMBER(radius, Float)
    146 };
    147 
    148 #endif
    149 
    150 DEFINE_GET_MEMBER(SkDrawRadialGradient);
    151 
    152 SkDrawRadialGradient::SkDrawRadialGradient() : radius(0) {
    153     center.set(0, 0);
    154 }
    155 
    156 #ifdef SK_DUMP_ENABLED
    157 void SkDrawRadialGradient::dump(SkAnimateMaker* maker) {
    158     dumpBase(maker);
    159     dumpRest(maker);
    160 }
    161 #endif
    162 
    163 SkShader* SkDrawRadialGradient::getShader() {
    164     if (addPrelude() == 0)
    165         return NULL;
    166     SkShader* shader = SkGradientShader::CreateRadial(center,
    167         radius, fColors.begin(), offsets.begin(), fColors.count(), (SkShader::TileMode) tileMode,
    168         0, getMatrix());
    169     SkAutoTDelete<SkShader> autoDel(shader);
    170     (void)autoDel.detach();
    171     return shader;
    172 }
    173