michael@0: 
michael@0: /*
michael@0:  * Copyright 2011 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: #include "SkImageView.h"
michael@0: #include "SkAnimator.h"
michael@0: #include "SkBitmap.h"
michael@0: #include "SkCanvas.h"
michael@0: #include "SkImageDecoder.h"
michael@0: #include "SkMatrix.h"
michael@0: #include "SkSystemEventTypes.h"
michael@0: #include "SkTime.h"
michael@0: 
michael@0: SkImageView::SkImageView()
michael@0: {
michael@0:     fMatrix        = NULL;
michael@0:     fScaleType    = kMatrix_ScaleType;
michael@0: 
michael@0:     fData.fAnim    = NULL;        // handles initializing the other union values
michael@0:     fDataIsAnim    = true;
michael@0: 
michael@0:     fUriIsValid    = false;    // an empty string is not valid
michael@0: }
michael@0: 
michael@0: SkImageView::~SkImageView()
michael@0: {
michael@0:     if (fMatrix)
michael@0:         sk_free(fMatrix);
michael@0: 
michael@0:     this->freeData();
michael@0: }
michael@0: 
michael@0: void SkImageView::getUri(SkString* uri) const
michael@0: {
michael@0:     if (uri)
michael@0:         *uri = fUri;
michael@0: }
michael@0: 
michael@0: void SkImageView::setUri(const char uri[])
michael@0: {
michael@0:     if (!fUri.equals(uri))
michael@0:     {
michael@0:         fUri.set(uri);
michael@0:         this->onUriChange();
michael@0:     }
michael@0: }
michael@0: 
michael@0: void SkImageView::setUri(const SkString& uri)
michael@0: {
michael@0:     if (fUri != uri)
michael@0:     {
michael@0:         fUri = uri;
michael@0:         this->onUriChange();
michael@0:     }
michael@0: }
michael@0: 
michael@0: void SkImageView::setScaleType(ScaleType st)
michael@0: {
michael@0:     SkASSERT((unsigned)st <= kFitEnd_ScaleType);
michael@0: 
michael@0:     if ((ScaleType)fScaleType != st)
michael@0:     {
michael@0:         fScaleType = SkToU8(st);
michael@0:         if (fUriIsValid)
michael@0:             this->inval(NULL);
michael@0:     }
michael@0: }
michael@0: 
michael@0: bool SkImageView::getImageMatrix(SkMatrix* matrix) const
michael@0: {
michael@0:     if (fMatrix)
michael@0:     {
michael@0:         SkASSERT(!fMatrix->isIdentity());
michael@0:         if (matrix)
michael@0:             *matrix = *fMatrix;
michael@0:         return true;
michael@0:     }
michael@0:     else
michael@0:     {
michael@0:         if (matrix)
michael@0:             matrix->reset();
michael@0:         return false;
michael@0:     }
michael@0: }
michael@0: 
michael@0: void SkImageView::setImageMatrix(const SkMatrix* matrix)
michael@0: {
michael@0:     bool changed = false;
michael@0: 
michael@0:     if (matrix && !matrix->isIdentity())
michael@0:     {
michael@0:         if (fMatrix == NULL)
michael@0:             fMatrix = (SkMatrix*)sk_malloc_throw(sizeof(SkMatrix));
michael@0:         *fMatrix = *matrix;
michael@0:         changed = true;
michael@0:     }
michael@0:     else    // set us to identity
michael@0:     {
michael@0:         if (fMatrix)
michael@0:         {
michael@0:             SkASSERT(!fMatrix->isIdentity());
michael@0:             sk_free(fMatrix);
michael@0:             fMatrix = NULL;
michael@0:             changed = true;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     // only redraw if we changed our matrix and we're not in scaleToFit mode
michael@0:     if (changed && this->getScaleType() == kMatrix_ScaleType && fUriIsValid)
michael@0:         this->inval(NULL);
michael@0: }
michael@0: 
michael@0: ///////////////////////////////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: bool SkImageView::onEvent(const SkEvent& evt)
michael@0: {
michael@0:     if (evt.isType(SK_EventType_Inval))
michael@0:     {
michael@0:         if (fUriIsValid)
michael@0:             this->inval(NULL);
michael@0:         return true;
michael@0:     }
michael@0:     return this->INHERITED::onEvent(evt);
michael@0: }
michael@0: 
michael@0: static inline SkMatrix::ScaleToFit scaleTypeToScaleToFit(SkImageView::ScaleType st)
michael@0: {
michael@0:     SkASSERT(st != SkImageView::kMatrix_ScaleType);
michael@0:     SkASSERT((unsigned)st <= SkImageView::kFitEnd_ScaleType);
michael@0: 
michael@0:     SkASSERT(SkImageView::kFitXY_ScaleType - 1 == SkMatrix::kFill_ScaleToFit);
michael@0:     SkASSERT(SkImageView::kFitStart_ScaleType - 1 == SkMatrix::kStart_ScaleToFit);
michael@0:     SkASSERT(SkImageView::kFitCenter_ScaleType - 1 == SkMatrix::kCenter_ScaleToFit);
michael@0:     SkASSERT(SkImageView::kFitEnd_ScaleType - 1 == SkMatrix::kEnd_ScaleToFit);
michael@0: 
michael@0:     return (SkMatrix::ScaleToFit)(st - 1);
michael@0: }
michael@0: 
michael@0: void SkImageView::onDraw(SkCanvas* canvas)
michael@0: {
michael@0:     SkRect    src;
michael@0:     if (!this->getDataBounds(&src))
michael@0:     {
michael@0:         SkDEBUGCODE(canvas->drawColor(SK_ColorRED);)
michael@0:         return;        // nothing to draw
michael@0:     }
michael@0: 
michael@0:     SkAutoCanvasRestore    restore(canvas, true);
michael@0:     SkMatrix            matrix;
michael@0: 
michael@0:     if (this->getScaleType() == kMatrix_ScaleType)
michael@0:         (void)this->getImageMatrix(&matrix);
michael@0:     else
michael@0:     {
michael@0:         SkRect    dst;
michael@0:         dst.set(0, 0, this->width(), this->height());
michael@0:         matrix.setRectToRect(src, dst, scaleTypeToScaleToFit(this->getScaleType()));
michael@0:     }
michael@0:     canvas->concat(matrix);
michael@0: 
michael@0:     SkPaint    paint;
michael@0: 
michael@0:     paint.setAntiAlias(true);
michael@0: 
michael@0:     if (fDataIsAnim)
michael@0:     {
michael@0:         SkMSec    now = SkTime::GetMSecs();
michael@0: 
michael@0:         SkAnimator::DifferenceType diff = fData.fAnim->draw(canvas, &paint, now);
michael@0: 
michael@0: SkDEBUGF(("SkImageView : now = %X[%12.3f], diff = %d\n", now, now/1000., diff));
michael@0: 
michael@0:         if (diff == SkAnimator::kDifferent)
michael@0:             this->inval(NULL);
michael@0:         else if (diff == SkAnimator::kPartiallyDifferent)
michael@0:         {
michael@0:             SkRect    bounds;
michael@0:             fData.fAnim->getInvalBounds(&bounds);
michael@0:             matrix.mapRect(&bounds);    // get the bounds into view coordinates
michael@0:             this->inval(&bounds);
michael@0:         }
michael@0:     }
michael@0:     else
michael@0:         canvas->drawBitmap(*fData.fBitmap, 0, 0, &paint);
michael@0: }
michael@0: 
michael@0: void SkImageView::onInflate(const SkDOM& dom, const SkDOMNode* node)
michael@0: {
michael@0:     this->INHERITED::onInflate(dom, node);
michael@0: 
michael@0:     const char* src = dom.findAttr(node, "src");
michael@0:     if (src)
michael@0:         this->setUri(src);
michael@0: 
michael@0:     int    index = dom.findList(node, "scaleType", "matrix,fitXY,fitStart,fitCenter,fitEnd");
michael@0:     if (index >= 0)
michael@0:         this->setScaleType((ScaleType)index);
michael@0: 
michael@0:     // need inflate syntax/reader for matrix
michael@0: }
michael@0: 
michael@0: /////////////////////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: void SkImageView::onUriChange()
michael@0: {
michael@0:     if (this->freeData())
michael@0:         this->inval(NULL);
michael@0:     fUriIsValid = true;        // give ensureUriIsLoaded() a shot at the new uri
michael@0: }
michael@0: 
michael@0: bool SkImageView::freeData()
michael@0: {
michael@0:     if (fData.fAnim)    // test is valid for all union values
michael@0:     {
michael@0:         if (fDataIsAnim)
michael@0:             delete fData.fAnim;
michael@0:         else
michael@0:             delete fData.fBitmap;
michael@0: 
michael@0:         fData.fAnim = NULL;    // valid for all union values
michael@0:         return true;
michael@0:     }
michael@0:     return false;
michael@0: }
michael@0: 
michael@0: bool SkImageView::getDataBounds(SkRect* bounds)
michael@0: {
michael@0:     SkASSERT(bounds);
michael@0: 
michael@0:     if (this->ensureUriIsLoaded())
michael@0:     {
michael@0:         SkScalar width, height;
michael@0: 
michael@0:         if (fDataIsAnim)
michael@0:         {
michael@0:             if (SkScalarIsNaN(width = fData.fAnim->getScalar("dimensions", "x")) ||
michael@0:                 SkScalarIsNaN(height = fData.fAnim->getScalar("dimensions", "y")))
michael@0:             {
michael@0:                 // cons up fake bounds
michael@0:                 width = this->width();
michael@0:                 height = this->height();
michael@0:             }
michael@0:         }
michael@0:         else
michael@0:         {
michael@0:             width = SkIntToScalar(fData.fBitmap->width());
michael@0:             height = SkIntToScalar(fData.fBitmap->height());
michael@0:         }
michael@0:         bounds->set(0, 0, width, height);
michael@0:         return true;
michael@0:     }
michael@0:     return false;
michael@0: }
michael@0: 
michael@0: bool SkImageView::ensureUriIsLoaded()
michael@0: {
michael@0:     if (fData.fAnim)    // test is valid for all union values
michael@0:     {
michael@0:         SkASSERT(fUriIsValid);
michael@0:         return true;
michael@0:     }
michael@0:     if (!fUriIsValid)
michael@0:         return false;
michael@0: 
michael@0:     // try to load the url
michael@0:     if (fUri.endsWith(".xml"))    // assume it is screenplay
michael@0:     {
michael@0:         SkAnimator* anim = new SkAnimator;
michael@0: 
michael@0:         if (!anim->decodeURI(fUri.c_str()))
michael@0:         {
michael@0:             delete anim;
michael@0:             fUriIsValid = false;
michael@0:             return false;
michael@0:         }
michael@0:         anim->setHostEventSink(this);
michael@0: 
michael@0:         fData.fAnim = anim;
michael@0:         fDataIsAnim = true;
michael@0:     }
michael@0:     else    // assume it is an image format
michael@0:     {
michael@0:     #if 0
michael@0:         SkBitmap* bitmap = new SkBitmap;
michael@0: 
michael@0:         if (!SkImageDecoder::DecodeURL(fUri.c_str(), bitmap))
michael@0:         {
michael@0:             delete bitmap;
michael@0:             fUriIsValid = false;
michael@0:             return false;
michael@0:         }
michael@0:         fData.fBitmap = bitmap;
michael@0:         fDataIsAnim = false;
michael@0:     #else
michael@0:         return false;
michael@0:     #endif
michael@0:     }
michael@0:     return true;
michael@0: }