src/views/SkParsePaint.cpp

/*
 * 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 "SkParsePaint.h"
#include "SkTSearch.h"
#include "SkParse.h"
#include "SkImageDecoder.h"
#include "SkGradientShader.h"

static SkShader* inflate_shader(const SkDOM& dom, const SkDOM::Node* node)
{
    if ((node = dom.getFirstChild(node, "shader")) == nullptr)
        return nullptr;

    const char* str;

    if (dom.hasAttr(node, "type", "linear-gradient"))
    {
        SkColor        colors[2];
        SkPoint        pts[2];

        colors[0] = colors[1] = SK_ColorBLACK;    // need to initialized the alpha to opaque, since FindColor doesn't set it
        if ((str = dom.findAttr(node, "c0")) != nullptr &&
            SkParse::FindColor(str, &colors[0]) &&
            (str = dom.findAttr(node, "c1")) != nullptr &&
            SkParse::FindColor(str, &colors[1]) &&
            dom.findScalars(node, "p0", &pts[0].fX, 2) &&
            dom.findScalars(node, "p1", &pts[1].fX, 2))
        {
            SkShader::TileMode    mode = SkShader::kClamp_TileMode;
            int                    index;

            if ((index = dom.findList(node, "tile-mode", "clamp,repeat,mirror")) >= 0)
                mode = (SkShader::TileMode)index;
            return SkGradientShader::CreateLinear(pts, colors, nullptr, 2, mode);
        }
    }
    else if (dom.hasAttr(node, "type", "bitmap"))
    {
        if ((str = dom.findAttr(node, "src")) == nullptr)
            return nullptr;

        SkBitmap    bm;

        if (SkImageDecoder::DecodeFile(str, &bm))
        {
            SkShader::TileMode    mode = SkShader::kRepeat_TileMode;
            int                    index;

            if ((index = dom.findList(node, "tile-mode", "clamp,repeat,mirror")) >= 0)
                mode = (SkShader::TileMode)index;

            return SkShader::CreateBitmapShader(bm, mode, mode);
        }
    }
    return nullptr;
}

void SkPaint_Inflate(SkPaint* paint, const SkDOM& dom, const SkDOM::Node* node)
{
    SkASSERT(paint);
    SkASSERT(&dom);
    SkASSERT(node);

    SkScalar x;

    if (dom.findScalar(node, "stroke-width", &x))
        paint->setStrokeWidth(x);
    if (dom.findScalar(node, "text-size", &x))
        paint->setTextSize(x);

    bool    b;

    SkASSERT("legacy: use is-stroke" && !dom.findBool(node, "is-frame", &b));

    if (dom.findBool(node, "is-stroke", &b))
        paint->setStyle(b ? SkPaint::kStroke_Style : SkPaint::kFill_Style);
    if (dom.findBool(node, "is-antialias", &b))
        paint->setAntiAlias(b);
    if (dom.findBool(node, "is-lineartext", &b))
        paint->setLinearText(b);

    const char* str = dom.findAttr(node, "color");
    if (str)
    {
        SkColor    c = paint->getColor();
        if (SkParse::FindColor(str, &c))
            paint->setColor(c);
    }

    // do this AFTER parsing for the color
    if (dom.findScalar(node, "opacity", &x))
    {
        x = SkMaxScalar(0, SkMinScalar(x, SK_Scalar1));
        paint->setAlpha(SkScalarRoundToInt(x * 255));
    }

    int    index = dom.findList(node, "text-anchor", "left,center,right");
    if (index >= 0)
        paint->setTextAlign((SkPaint::Align)index);

    SkShader* shader = inflate_shader(dom, node);
    if (shader)
        paint->setShader(shader)->unref();
}