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bartekscbarteksc
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Merge branch 'OstAlex-pageLoad'
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‎README.md‎

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@@ -2,6 +2,13 @@
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# Android PdfViewer
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__这个分支，在原3.1.0-beta1的基础上，优化了渲染区域的计算方式，减少不必要的渲染区域。__
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3.1.0-beta1在计算渲染方式上有个bug，在跨页的时候会渲染上一页的最后一行，不管这一行是不是全部显示在屏幕中。当放大的倍数越大，
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需要渲染的块就多，由于最大数量的限制，会导致部分在屏幕下方的区域不会被渲染。
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__AndroidPdfViewer 1.x is available on [AndroidPdfViewerV1](https://github.com/barteksc/AndroidPdfViewerV1)
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repo, where can be developed independently. Version 1.x uses different engine for drawing document on canvas,
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so if you don't like 2.x version, try 1.x.__

‎android-pdf-viewer/src/main/java/com/github/barteksc/pdfviewer/PagesLoader.java‎

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import com.github.barteksc.pdfviewer.util.Util;
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import com.shockwave.pdfium.util.SizeF;
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import java.util.LinkedList;
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import java.util.List;
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import static com.github.barteksc.pdfviewer.util.Constants.Cache.CACHE_SIZE;
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import static com.github.barteksc.pdfviewer.util.Constants.PRELOAD_OFFSET;
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@@ -37,21 +40,55 @@ class PagesLoader {
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private float partRenderHeight;
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private final RectF thumbnailRect = new RectF(0, 0, 1, 1);
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private final int preloadOffset;
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private final Holder firstHolder = new Holder();
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private final Holder lastHolder = new Holder();
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private final GridSize firstGrid = new GridSize();
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private final GridSize lastGrid = new GridSize();
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private final GridSize middleGrid = new GridSize();
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private class Holder {
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int page;
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int row;
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int col;
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@Override
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public String toString() {
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return "Holder{" +
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"row=" + row +
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", col=" + col +
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'}';
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}
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}
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private class RenderRange {
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int page;
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GridSize gridSize;
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Holder leftTop;
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Holder rightBottom;
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RenderRange() {
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this.page = 0;
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this.gridSize = new GridSize();
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this.leftTop = new Holder();
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this.rightBottom = new Holder();
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}
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@Override
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public String toString() {
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return "RenderRange{" +
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"page=" + page +
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", gridSize=" + gridSize +
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", leftTop=" + leftTop +
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", rightBottom=" + rightBottom +
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'}';
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}
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}
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private class GridSize {
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int rows;
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int cols;
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@Override
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public String toString() {
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return "GridSize{" +
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"rows=" + rows +
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", cols=" + cols +
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'}';
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}
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}
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PagesLoader(PDFView pdfView) {
@@ -69,124 +106,144 @@ private void getPageColsRows(GridSize grid, int pageIndex) {
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grid.cols = MathUtils.ceil(1f / partWidth);
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}
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private Holder getPageAndCoordsByOffset(Holder holder, GridSize grid, float localXOffset,
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float localYOffset, boolean endOffset) {
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float fixedXOffset = -MathUtils.max(localXOffset, 0);
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float fixedYOffset = -MathUtils.max(localYOffset, 0);
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float offset = pdfView.isSwipeVertical() ? fixedYOffset : fixedXOffset;
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holder.page = pdfView.pdfFile.getPageAtOffset(offset, pdfView.getZoom());
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getPageColsRows(grid, holder.page);
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SizeF scaledPageSize = pdfView.pdfFile.getScaledPageSize(holder.page, pdfView.getZoom());
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float rowHeight = scaledPageSize.getHeight() / grid.rows;
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float colWidth = scaledPageSize.getWidth() / grid.cols;
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float row, col;
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float secondaryOffset = pdfView.pdfFile.getSecondaryPageOffset(holder.page, pdfView.getZoom());
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if (pdfView.isSwipeVertical()) {
85-
row = Math.abs(fixedYOffset - pdfView.pdfFile.getPageOffset(holder.page, pdfView.getZoom())) / rowHeight;
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col = MathUtils.min(fixedXOffset - secondaryOffset, 0) / colWidth;
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} else {
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col = Math.abs(fixedXOffset - pdfView.pdfFile.getPageOffset(holder.page, pdfView.getZoom())) / colWidth;
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row = MathUtils.min(fixedYOffset - secondaryOffset, 0) / rowHeight;
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}
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92-
if (endOffset) {
93-
holder.row = MathUtils.ceil(row);
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holder.col = MathUtils.ceil(col);
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} else {
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holder.row = MathUtils.floor(row);
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holder.col = MathUtils.floor(col);
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}
99-
return holder;
100-
}
101-
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private void calculatePartSize(GridSize grid) {
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pageRelativePartWidth = 1f / (float) grid.cols;
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pageRelativePartHeight = 1f / (float) grid.rows;
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partRenderWidth = Constants.PART_SIZE / pageRelativePartWidth;
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partRenderHeight = Constants.PART_SIZE / pageRelativePartHeight;
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}
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109-
private void loadVisible() {
110-
int parts = 0;
111-
float scaledPreloadOffset = preloadOffset * pdfView.getZoom();
112-
float firstXOffset = -xOffset + scaledPreloadOffset;
113-
float lastXOffset = -xOffset - pdfView.getWidth() - scaledPreloadOffset;
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float firstYOffset = -yOffset + scaledPreloadOffset;
115-
float lastYOffset = -yOffset - pdfView.getHeight() - scaledPreloadOffset;
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117-
getPageAndCoordsByOffset(firstHolder, firstGrid, firstXOffset, firstYOffset, false);
118-
getPageAndCoordsByOffset(lastHolder, lastGrid, lastXOffset, lastYOffset, true);
117+
/**
118+
* calculate the render range of each page
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*/
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private List<RenderRange> getRenderRangeList(float firstXOffset, float firstYOffset, float lastXOffset, float lastYOffset) {
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float fixedFirstXOffset = -MathUtils.max(firstXOffset, 0);
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float fixedFirstYOffset = -MathUtils.max(firstYOffset, 0);
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float fixedLastXOffset = -MathUtils.max(lastXOffset, 0);
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float fixedLastYOffset = -MathUtils.max(lastYOffset, 0);
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float offsetFirst = pdfView.isSwipeVertical() ? fixedFirstYOffset : fixedFirstXOffset;
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float offsetLast = pdfView.isSwipeVertical() ? fixedLastYOffset : fixedLastXOffset;
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int firstPage = pdfView.pdfFile.getPageAtOffset(offsetFirst, pdfView.getZoom());
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int lastPage = pdfView.pdfFile.getPageAtOffset(offsetLast, pdfView.getZoom());
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int pageCount = lastPage - firstPage + 1;
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List<RenderRange> renderRanges = new LinkedList<>();
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for (int page = firstPage; page <= lastPage; page++) {
138+
RenderRange range = new RenderRange();
139+
range.page = page;
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float pageFirstXOffset, pageFirstYOffset, pageLastXOffset, pageLastYOffset;
142+
if (page == firstPage) {
143+
pageFirstXOffset = fixedFirstXOffset;
144+
pageFirstYOffset = fixedFirstYOffset;
145+
if (pageCount == 1) {
146+
pageLastXOffset = fixedLastXOffset;
147+
pageLastYOffset = fixedLastYOffset;
148+
} else {
149+
float pageOffset = pdfView.pdfFile.getPageOffset(page, pdfView.getZoom());
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SizeF pageSize = pdfView.pdfFile.getScaledPageSize(page, pdfView.getZoom());
151+
if (pdfView.isSwipeVertical()) {
152+
pageLastXOffset = fixedLastXOffset;
153+
pageLastYOffset = pageOffset + pageSize.getHeight();
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} else {
155+
pageLastYOffset = fixedLastYOffset;
156+
pageLastXOffset = pageOffset + pageSize.getWidth();
157+
}
158+
}
159+
} else if (page == lastPage) {
160+
float pageOffset = pdfView.pdfFile.getPageOffset(page, pdfView.getZoom());
161+
162+
if (pdfView.isSwipeVertical()) {
163+
pageFirstXOffset = fixedFirstXOffset;
164+
pageFirstYOffset = pageOffset;
165+
} else {
166+
pageFirstYOffset = fixedFirstYOffset;
167+
pageFirstXOffset = pageOffset;
168+
}
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120-
for (int i = firstHolder.page; i <= lastHolder.page; i++) {
121-
loadThumbnail(i);
122-
}
170+
pageLastXOffset = fixedLastXOffset;
171+
pageLastYOffset = fixedLastYOffset;
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124-
int pagesCount = lastHolder.page - firstHolder.page + 1;
125-
for (int page = firstHolder.page; page <= lastHolder.page && parts < CACHE_SIZE; page++) {
173+
} else {
174+
float pageOffset = pdfView.pdfFile.getPageOffset(page, pdfView.getZoom());
175+
SizeF pageSize = pdfView.pdfFile.getScaledPageSize(page, pdfView.getZoom());
176+
if (pdfView.isSwipeVertical()) {
177+
pageFirstXOffset = fixedFirstXOffset;
178+
pageFirstYOffset = pageOffset;
179+
180+
pageLastXOffset = fixedLastXOffset;
181+
pageLastYOffset = pageOffset + pageSize.getHeight();
182+
} else {
183+
pageFirstXOffset = pageOffset;
184+
pageFirstYOffset = fixedFirstYOffset;
185+
186+
pageLastXOffset = pageOffset + pageSize.getWidth();
187+
pageLastYOffset = fixedLastYOffset;
188+
}
189+
}
190+
191+
getPageColsRows(range.gridSize, range.page); // get the page's grid size that rows and cols
192+
SizeF scaledPageSize = pdfView.pdfFile.getScaledPageSize(range.page, pdfView.getZoom());
193+
float rowHeight = scaledPageSize.getHeight() / range.gridSize.rows;
194+
float colWidth = scaledPageSize.getWidth() / range.gridSize.cols;
195+
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// get the page offset int the whole file
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// ---------------------------------------
199+
// | | | |
200+
// |<--offset-->| (page) |<--offset-->|
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// | | | |
202+
// | | | |
203+
// ---------------------------------------
204+
float secondaryOffset = pdfView.pdfFile.getSecondaryPageOffset(page, pdfView.getZoom());
205+
206+
// calculate the row,col of the point in the leftTop and rightBottom
207+
if (pdfView.isSwipeVertical()) {
208+
range.leftTop.row = MathUtils.floor(Math.abs(pageFirstYOffset - pdfView.pdfFile.getPageOffset(range.page, pdfView.getZoom())) / rowHeight);
209+
range.leftTop.col = MathUtils.floor(MathUtils.min(pageFirstXOffset - secondaryOffset, 0) / colWidth);
126210

127-
if (page == firstHolder.page && pagesCount > 1) {
128-
parts += loadPageEnd(firstHolder, firstGrid, CACHE_SIZE - parts);
129-
} else if (page == lastHolder.page && pagesCount > 1) {
130-
parts += loadPageStart(lastHolder, lastGrid, CACHE_SIZE - parts);
131-
} else if(pagesCount == 1) {
132-
parts += loadPageCenter(firstHolder, lastHolder, firstGrid, CACHE_SIZE - parts);
211+
range.rightBottom.row = MathUtils.ceil(Math.abs(pageLastYOffset - pdfView.pdfFile.getPageOffset(range.page, pdfView.getZoom())) / rowHeight);
212+
range.rightBottom.col = MathUtils.floor(MathUtils.min(pageLastXOffset - secondaryOffset, 0) / colWidth);
133213
} else {
134-
getPageColsRows(middleGrid, page);
135-
parts += loadWholePage(page, middleGrid, CACHE_SIZE - parts);
214+
range.leftTop.col = MathUtils.floor(Math.abs(pageFirstXOffset - pdfView.pdfFile.getPageOffset(range.page, pdfView.getZoom())) / colWidth);
215+
range.leftTop.row = MathUtils.floor(MathUtils.min(pageFirstYOffset - secondaryOffset, 0) / rowHeight);
216+
217+
range.rightBottom.col = MathUtils.floor(Math.abs(pageLastXOffset - pdfView.pdfFile.getPageOffset(range.page, pdfView.getZoom())) / colWidth);
218+
range.rightBottom.row = MathUtils.floor(MathUtils.min(pageLastYOffset - secondaryOffset, 0) / rowHeight);
136219
}
220+
221+
renderRanges.add(range);
137222
}
138223

224+
return renderRanges;
139225
}
140226

141-
/**
142-
* When whole page is visible
143-
*
144-
* @return loaded parts count
145-
*/
146-
private int loadWholePage(int page, GridSize grid, int nbOfPartsLoadable) {
147-
calculatePartSize(grid);
148-
return loadPage(page, 0, grid.rows - 1, 0, grid.cols - 1, nbOfPartsLoadable);
149-
}
227+
private void loadVisible() {
228+
int parts = 0;
229+
float scaledPreloadOffset = preloadOffset;
230+
float firstXOffset = -xOffset + scaledPreloadOffset;
231+
float lastXOffset = -xOffset - pdfView.getWidth() - scaledPreloadOffset;
232+
float firstYOffset = -yOffset + scaledPreloadOffset;
233+
float lastYOffset = -yOffset - pdfView.getHeight() - scaledPreloadOffset;
150234

151-
/**
152-
* When only part of one page is visible
153-
*
154-
* @return loaded parts count
155-
*/
156-
private int loadPageCenter(Holder firstHolder, Holder lastHolder, GridSize grid, int nbOfPartsLoadable) {
157-
calculatePartSize(grid);
158-
return loadPage(firstHolder.page, firstHolder.row, lastHolder.row, firstHolder.col, lastHolder.col, nbOfPartsLoadable);
159-
}
235+
List<RenderRange> rangeList = getRenderRangeList(firstXOffset, firstYOffset, lastXOffset, lastYOffset);
160236

161-
/**
162-
* When only end of page is visible
163-
*
164-
* @return loaded parts count
165-
*/
166-
private int loadPageEnd(Holder holder, GridSize grid, int nbOfPartsLoadable) {
167-
calculatePartSize(grid);
168-
if (pdfView.isSwipeVertical()) {
169-
int firstRow = holder.row;
170-
return loadPage(holder.page, firstRow, grid.rows - 1, 0, grid.cols - 1, nbOfPartsLoadable);
171-
} else {
172-
int firstCol = holder.col;
173-
return loadPage(holder.page, 0, grid.rows - 1, firstCol, grid.cols - 1, nbOfPartsLoadable);
237+
for (RenderRange range : rangeList) {
238+
loadThumbnail(range.page);
174239
}
175-
}
176240

177-
/**
178-
* If only start of the page is visible
179-
*
180-
* @return loaded parts count
181-
*/
182-
private int loadPageStart(Holder holder, GridSize grid, int nbOfPartsLoadable) {
183-
calculatePartSize(grid);
184-
if (pdfView.isSwipeVertical()) {
185-
int lastRow = holder.row;
186-
return loadPage(holder.page, 0, lastRow, 0, grid.cols - 1, nbOfPartsLoadable);
187-
} else {
188-
int lastCol = holder.col;
189-
return loadPage(holder.page, 0, grid.rows - 1, 0, lastCol, nbOfPartsLoadable);
241+
for (RenderRange range : rangeList) {
242+
calculatePartSize(range.gridSize);
243+
parts += loadPage(range.page, range.leftTop.row, range.rightBottom.row, range.leftTop.col, range.rightBottom.col, CACHE_SIZE - parts);
244+
if (parts >= CACHE_SIZE) {
245+
break;
246+
}
190247
}
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}

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