From 0035fc7cc5a1c17fee95c545b67be13f72b314a8 Mon Sep 17 00:00:00 2001 From: gedoor Date: Fri, 26 Mar 2021 08:57:57 +0800 Subject: [PATCH] =?UTF-8?q?=E4=BC=98=E5=8C=96?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../main/assets/defaultData/rssSources.json | 13 +- .../read/page/delegate/curl/CurlMesh.java | 957 ++++++++++++++++++ .../read/page/delegate/curl/CurlPage.java | 195 ++++ 3 files changed, 1163 insertions(+), 2 deletions(-) create mode 100644 app/src/main/java/io/legado/app/ui/book/read/page/delegate/curl/CurlMesh.java create mode 100644 app/src/main/java/io/legado/app/ui/book/read/page/delegate/curl/CurlPage.java diff --git a/app/src/main/assets/defaultData/rssSources.json b/app/src/main/assets/defaultData/rssSources.json index bc1754b59..cb6140a93 100644 --- a/app/src/main/assets/defaultData/rssSources.json +++ b/app/src/main/assets/defaultData/rssSources.json @@ -1,9 +1,18 @@ [ { - "articleStyle": 0, "customOrder": 1, "enableJs": true, "enabled": true, + "singleUrl": true, + "sourceIcon": "http:\/\/ku.mumuceo.com\/static\/images\/applogo\/yuedu.png", + "sourceName": "使用说明", + "sourceUrl": "https://www.yuque.com/legado" + }, + { + "articleStyle": 0, + "customOrder": 2, + "enableJs": true, + "enabled": true, "loadWithBaseUrl": false, "ruleArticles": "class.release-main-section||tbody@tr", "ruleContent": "@js:\nif(baseUrl.match(\/90pan\/)){\nresult=result.replace(\/true\\||<.*?>([^<]+)<\\\/span><\\\/a>\/g,'

$2<\/a><\/h4>

$1<\/p>\\n\\n')}\nelse{\nhtml=String(java.getString(\"@@class.markdown-body@html\",false)+java.getString(\"@@class.flex-justify-between.-1@html\",false));\nhref='https:\/\/github.com'+String(java.getString(\"@@class.flex-justify-between.-1@class.Box-body.0@a@href\",false))\nhtml+'

下载地址：<\/p>'+href+'<\/a>'\n}", @@ -19,7 +28,7 @@ "style": "" }, { - "customOrder": 1, + "customOrder": 3, "enableJs": true, "enabled": true, "singleUrl": true, diff --git a/app/src/main/java/io/legado/app/ui/book/read/page/delegate/curl/CurlMesh.java b/app/src/main/java/io/legado/app/ui/book/read/page/delegate/curl/CurlMesh.java new file mode 100644 index 000000000..e416bea3a --- /dev/null +++ b/app/src/main/java/io/legado/app/ui/book/read/page/delegate/curl/CurlMesh.java @@ -0,0 +1,957 @@ +package io.legado.app.ui.book.read.page.delegate.curl; + +import android.graphics.Bitmap; +import android.graphics.Color; +import android.graphics.PointF; +import android.graphics.RectF; +import android.opengl.GLUtils; + +import java.nio.ByteBuffer; +import java.nio.ByteOrder; +import java.nio.FloatBuffer; + +import javax.microedition.khronos.opengles.GL10; + +/** + * Class implementing actual curl/page rendering. + * + * @author harism + */ +public class CurlMesh { + + // Flag for rendering some lines used for developing. Shows + // curl position and one for the direction from the + // position given. Comes handy once playing around with different + // ways for following pointer. + private static final boolean DRAW_CURL_POSITION = false; + // Flag for drawing polygon outlines. Using this flag crashes on emulator + // due to reason unknown to me. Leaving it here anyway as seeing polygon + // outlines gives good insight how original rectangle is divided. + private static final boolean DRAW_POLYGON_OUTLINES = false; + // Flag for enabling shadow rendering. + private static final boolean DRAW_SHADOW = true; + // Flag for texture rendering. While this is likely something you + // don't want to do it's been used for development purposes as texture + // rendering is rather slow on emulator. + private static final boolean DRAW_TEXTURE = true; + + // Colors for shadow. Inner one is the color drawn next to surface where + // shadowed area starts and outer one is color shadow ends to. + private static final float[] SHADOW_INNER_COLOR = {0f, 0f, 0f, .5f}; + private static final float[] SHADOW_OUTER_COLOR = {0f, 0f, 0f, .0f}; + + // Let's avoid using 'new' as much as possible. Meaning we introduce arrays + // once here and reuse them on runtime. Doesn't really have very much effect + // but avoids some garbage collections from happening. + private Array mArrDropShadowVertices; + private Array mArrIntersections; + private Array mArrOutputVertices; + private Array mArrRotatedVertices; + private Array mArrScanLines; + private Array mArrSelfShadowVertices; + private Array mArrTempShadowVertices; + private Array mArrTempVertices; + + // Buffers for feeding rasterizer. + private FloatBuffer mBufColors; + private FloatBuffer mBufCurlPositionLines; + private FloatBuffer mBufShadowColors; + private FloatBuffer mBufShadowVertices; + private FloatBuffer mBufTexCoords; + private FloatBuffer mBufVertices; + + private int mCurlPositionLinesCount; + private int mDropShadowCount; + + // Boolean for 'flipping' texture sideways. + private boolean mFlipTexture = false; + // Maximum number of split lines used for creating a curl. + private int mMaxCurlSplits; + + // Bounding rectangle for this mesh. mRectagle[0] = top-left corner, + // mRectangle[1] = bottom-left, mRectangle[2] = top-right and mRectangle[3] + // bottom-right. + private final Vertex[] mRectangle = new Vertex[4]; + private int mSelfShadowCount; + + private boolean mTextureBack = false; + // Texture ids and other variables. + private int[] mTextureIds = null; + private final CurlPage mTexturePage = new CurlPage(); + private final RectF mTextureRectBack = new RectF(); + private final RectF mTextureRectFront = new RectF(); + + private int mVerticesCountBack; + private int mVerticesCountFront; + + /** + * Constructor for mesh object. + * + * @param maxCurlSplits Maximum number curl can be divided into. The bigger the value + * the smoother curl will be. With the cost of having more + * polygons for drawing. + */ + public CurlMesh(int maxCurlSplits) { + // There really is no use for 0 splits. + mMaxCurlSplits = maxCurlSplits < 1 ? 1 : maxCurlSplits; + + mArrScanLines = new Array(maxCurlSplits + 2); + mArrOutputVertices = new Array(7); + mArrRotatedVertices = new Array(4); + mArrIntersections = new Array(2); + mArrTempVertices = new Array(7 + 4); + for (int i = 0; i < 7 + 4; ++i) { + mArrTempVertices.add(new Vertex()); + } + + if (DRAW_SHADOW) { + mArrSelfShadowVertices = new Array( + (mMaxCurlSplits + 2) * 2); + mArrDropShadowVertices = new Array( + (mMaxCurlSplits + 2) * 2); + mArrTempShadowVertices = new Array( + (mMaxCurlSplits + 2) * 2); + for (int i = 0; i < (mMaxCurlSplits + 2) * 2; ++i) { + mArrTempShadowVertices.add(new ShadowVertex()); + } + } + + // Rectangle consists of 4 vertices. Index 0 = top-left, index 1 = + // bottom-left, index 2 = top-right and index 3 = bottom-right. + for (int i = 0; i < 4; ++i) { + mRectangle[i] = new Vertex(); + } + // Set up shadow penumbra direction to each vertex. We do fake 'self + // shadow' calculations based on this information. + mRectangle[0].mPenumbraX = mRectangle[1].mPenumbraX = mRectangle[1].mPenumbraY = mRectangle[3].mPenumbraY = -1; + mRectangle[0].mPenumbraY = mRectangle[2].mPenumbraX = mRectangle[2].mPenumbraY = mRectangle[3].mPenumbraX = 1; + + if (DRAW_CURL_POSITION) { + mCurlPositionLinesCount = 3; + ByteBuffer hvbb = ByteBuffer + .allocateDirect(mCurlPositionLinesCount * 2 * 2 * 4); + hvbb.order(ByteOrder.nativeOrder()); + mBufCurlPositionLines = hvbb.asFloatBuffer(); + mBufCurlPositionLines.position(0); + } + + // There are 4 vertices from bounding rect, max 2 from adding split line + // to two corners and curl consists of max mMaxCurlSplits lines each + // outputting 2 vertices. + int maxVerticesCount = 4 + 2 + (2 * mMaxCurlSplits); + ByteBuffer vbb = ByteBuffer.allocateDirect(maxVerticesCount * 3 * 4); + vbb.order(ByteOrder.nativeOrder()); + mBufVertices = vbb.asFloatBuffer(); + mBufVertices.position(0); + + if (DRAW_TEXTURE) { + ByteBuffer tbb = ByteBuffer + .allocateDirect(maxVerticesCount * 2 * 4); + tbb.order(ByteOrder.nativeOrder()); + mBufTexCoords = tbb.asFloatBuffer(); + mBufTexCoords.position(0); + } + + ByteBuffer cbb = ByteBuffer.allocateDirect(maxVerticesCount * 4 * 4); + cbb.order(ByteOrder.nativeOrder()); + mBufColors = cbb.asFloatBuffer(); + mBufColors.position(0); + + if (DRAW_SHADOW) { + int maxShadowVerticesCount = (mMaxCurlSplits + 2) * 2 * 2; + ByteBuffer scbb = ByteBuffer + .allocateDirect(maxShadowVerticesCount * 4 * 4); + scbb.order(ByteOrder.nativeOrder()); + mBufShadowColors = scbb.asFloatBuffer(); + mBufShadowColors.position(0); + + ByteBuffer sibb = ByteBuffer + .allocateDirect(maxShadowVerticesCount * 3 * 4); + sibb.order(ByteOrder.nativeOrder()); + mBufShadowVertices = sibb.asFloatBuffer(); + mBufShadowVertices.position(0); + + mDropShadowCount = mSelfShadowCount = 0; + } + } + + /** + * Adds vertex to buffers. + */ + private void addVertex(Vertex vertex) { + mBufVertices.put((float) vertex.mPosX); + mBufVertices.put((float) vertex.mPosY); + mBufVertices.put((float) vertex.mPosZ); + mBufColors.put(vertex.mColorFactor * Color.red(vertex.mColor) / 255f); + mBufColors.put(vertex.mColorFactor * Color.green(vertex.mColor) / 255f); + mBufColors.put(vertex.mColorFactor * Color.blue(vertex.mColor) / 255f); + mBufColors.put(Color.alpha(vertex.mColor) / 255f); + if (DRAW_TEXTURE) { + mBufTexCoords.put((float) vertex.mTexX); + mBufTexCoords.put((float) vertex.mTexY); + } + } + + /** + * Sets curl for this mesh. + * + * @param curlPos Position for curl 'center'. Can be any point on line collinear + * to curl. + * @param curlDir Curl direction, should be normalized. + * @param radius Radius of curl. + */ + public synchronized void curl(PointF curlPos, PointF curlDir, double radius) { + + // First add some 'helper' lines used for development. + if (DRAW_CURL_POSITION) { + mBufCurlPositionLines.position(0); + + mBufCurlPositionLines.put(curlPos.x); + mBufCurlPositionLines.put(curlPos.y - 1.0f); + mBufCurlPositionLines.put(curlPos.x); + mBufCurlPositionLines.put(curlPos.y + 1.0f); + mBufCurlPositionLines.put(curlPos.x - 1.0f); + mBufCurlPositionLines.put(curlPos.y); + mBufCurlPositionLines.put(curlPos.x + 1.0f); + mBufCurlPositionLines.put(curlPos.y); + + mBufCurlPositionLines.put(curlPos.x); + mBufCurlPositionLines.put(curlPos.y); + mBufCurlPositionLines.put(curlPos.x + curlDir.x * 2); + mBufCurlPositionLines.put(curlPos.y + curlDir.y * 2); + + mBufCurlPositionLines.position(0); + } + + // Actual 'curl' implementation starts here. + mBufVertices.position(0); + mBufColors.position(0); + if (DRAW_TEXTURE) { + mBufTexCoords.position(0); + } + + // Calculate curl angle from direction. + double curlAngle = Math.acos(curlDir.x); + curlAngle = curlDir.y > 0 ? -curlAngle : curlAngle; + + // Initiate rotated rectangle which's is translated to curlPos and + // rotated so that curl direction heads to right (1,0). Vertices are + // ordered in ascending order based on x -coordinate at the same time. + // And using y -coordinate in very rare case in which two vertices have + // same x -coordinate. + mArrTempVertices.addAll(mArrRotatedVertices); + mArrRotatedVertices.clear(); + for (int i = 0; i < 4; ++i) { + Vertex v = mArrTempVertices.remove(0); + v.set(mRectangle[i]); + v.translate(-curlPos.x, -curlPos.y); + v.rotateZ(-curlAngle); + int j = 0; + for (; j < mArrRotatedVertices.size(); ++j) { + Vertex v2 = mArrRotatedVertices.get(j); + if (v.mPosX > v2.mPosX) { + break; + } + if (v.mPosX == v2.mPosX && v.mPosY > v2.mPosY) { + break; + } + } + mArrRotatedVertices.add(j, v); + } + + // Rotated rectangle lines/vertex indices. We need to find bounding + // lines for rotated rectangle. After sorting vertices according to + // their x -coordinate we don't have to worry about vertices at indices + // 0 and 1. But due to inaccuracy it's possible vertex 3 is not the + // opposing corner from vertex 0. So we are calculating distance from + // vertex 0 to vertices 2 and 3 - and altering line indices if needed. + // Also vertices/lines are given in an order first one has x -coordinate + // at least the latter one. This property is used in getIntersections to + // see if there is an intersection. + int lines[][] = {{0, 1}, {0, 2}, {1, 3}, {2, 3}}; + { + // TODO: There really has to be more 'easier' way of doing this - + // not including extensive use of sqrt. + Vertex v0 = mArrRotatedVertices.get(0); + Vertex v2 = mArrRotatedVertices.get(2); + Vertex v3 = mArrRotatedVertices.get(3); + double dist2 = Math.sqrt((v0.mPosX - v2.mPosX) + * (v0.mPosX - v2.mPosX) + (v0.mPosY - v2.mPosY) + * (v0.mPosY - v2.mPosY)); + double dist3 = Math.sqrt((v0.mPosX - v3.mPosX) + * (v0.mPosX - v3.mPosX) + (v0.mPosY - v3.mPosY) + * (v0.mPosY - v3.mPosY)); + if (dist2 > dist3) { + lines[1][1] = 3; + lines[2][1] = 2; + } + } + + mVerticesCountFront = mVerticesCountBack = 0; + + if (DRAW_SHADOW) { + mArrTempShadowVertices.addAll(mArrDropShadowVertices); + mArrTempShadowVertices.addAll(mArrSelfShadowVertices); + mArrDropShadowVertices.clear(); + mArrSelfShadowVertices.clear(); + } + + // Length of 'curl' curve. + double curlLength = Math.PI * radius; + // Calculate scan lines. + // TODO: Revisit this code one day. There is room for optimization here. + mArrScanLines.clear(); + if (mMaxCurlSplits > 0) { + mArrScanLines.add((double) 0); + } + for (int i = 1; i < mMaxCurlSplits; ++i) { + mArrScanLines.add((-curlLength * i) / (mMaxCurlSplits - 1)); + } + // As mRotatedVertices is ordered regarding x -coordinate, adding + // this scan line produces scan area picking up vertices which are + // rotated completely. One could say 'until infinity'. + mArrScanLines.add(mArrRotatedVertices.get(3).mPosX - 1); + + // Start from right most vertex. Pretty much the same as first scan area + // is starting from 'infinity'. + double scanXmax = mArrRotatedVertices.get(0).mPosX + 1; + + for (int i = 0; i < mArrScanLines.size(); ++i) { + // Once we have scanXmin and scanXmax we have a scan area to start + // working with. + double scanXmin = mArrScanLines.get(i); + // First iterate 'original' rectangle vertices within scan area. + for (int j = 0; j < mArrRotatedVertices.size(); ++j) { + Vertex v = mArrRotatedVertices.get(j); + // Test if vertex lies within this scan area. + // TODO: Frankly speaking, can't remember why equality check was + // added to both ends. Guessing it was somehow related to case + // where radius=0f, which, given current implementation, could + // be handled much more effectively anyway. + if (v.mPosX >= scanXmin && v.mPosX <= scanXmax) { + // Pop out a vertex from temp vertices. + Vertex n = mArrTempVertices.remove(0); + n.set(v); + // This is done solely for triangulation reasons. Given a + // rotated rectangle it has max 2 vertices having + // intersection. + Array intersections = getIntersections( + mArrRotatedVertices, lines, n.mPosX); + // In a sense one could say we're adding vertices always in + // two, positioned at the ends of intersecting line. And for + // triangulation to work properly they are added based on y + // -coordinate. And this if-else is doing it for us. + if (intersections.size() == 1 + && intersections.get(0).mPosY > v.mPosY) { + // In case intersecting vertex is higher add it first. + mArrOutputVertices.addAll(intersections); + mArrOutputVertices.add(n); + } else if (intersections.size() <= 1) { + // Otherwise add original vertex first. + mArrOutputVertices.add(n); + mArrOutputVertices.addAll(intersections); + } else { + // There should never be more than 1 intersecting + // vertex. But if it happens as a fallback simply skip + // everything. + mArrTempVertices.add(n); + mArrTempVertices.addAll(intersections); + } + } + } + + // Search for scan line intersections. + Array intersections = getIntersections(mArrRotatedVertices, + lines, scanXmin); + + // We expect to get 0 or 2 vertices. In rare cases there's only one + // but in general given a scan line intersecting rectangle there + // should be 2 intersecting vertices. + if (intersections.size() == 2) { + // There were two intersections, add them based on y + // -coordinate, higher first, lower last. + Vertex v1 = intersections.get(0); + Vertex v2 = intersections.get(1); + if (v1.mPosY < v2.mPosY) { + mArrOutputVertices.add(v2); + mArrOutputVertices.add(v1); + } else { + mArrOutputVertices.addAll(intersections); + } + } else if (intersections.size() != 0) { + // This happens in a case in which there is a original vertex + // exactly at scan line or something went very much wrong if + // there are 3+ vertices. What ever the reason just return the + // vertices to temp vertices for later use. In former case it + // was handled already earlier once iterating through + // mRotatedVertices, in latter case it's better to avoid doing + // anything with them. + mArrTempVertices.addAll(intersections); + } + + // Add vertices found during this iteration to vertex etc buffers. + while (mArrOutputVertices.size() > 0) { + Vertex v = mArrOutputVertices.remove(0); + mArrTempVertices.add(v); + + // Local texture front-facing flag. + boolean textureFront; + + // Untouched vertices. + if (i == 0) { + textureFront = true; + mVerticesCountFront++; + } + // 'Completely' rotated vertices. + else if (i == mArrScanLines.size() - 1 || curlLength == 0) { + v.mPosX = -(curlLength + v.mPosX); + v.mPosZ = 2 * radius; + v.mPenumbraX = -v.mPenumbraX; + + textureFront = false; + mVerticesCountBack++; + } + // Vertex lies within 'curl'. + else { + // Even though it's not obvious from the if-else clause, + // here v.mPosX is between [-curlLength, 0]. And we can do + // calculations around a half cylinder. + double rotY = Math.PI * (v.mPosX / curlLength); + v.mPosX = radius * Math.sin(rotY); + v.mPosZ = radius - (radius * Math.cos(rotY)); + v.mPenumbraX *= Math.cos(rotY); + // Map color multiplier to [.1f, 1f] range. + v.mColorFactor = (float) (.1f + .9f * Math.sqrt(Math + .sin(rotY) + 1)); + + if (v.mPosZ >= radius) { + textureFront = false; + mVerticesCountBack++; + } else { + textureFront = true; + mVerticesCountFront++; + } + } + + // We use local textureFront for flipping backside texture + // locally. Plus additionally if mesh is in flip texture mode, + // we'll make the procedure "backwards". Also, until this point, + // texture coordinates are within [0, 1] range so we'll adjust + // them to final texture coordinates too. + if (textureFront != mFlipTexture) { + v.mTexX *= mTextureRectFront.right; + v.mTexY *= mTextureRectFront.bottom; + v.mColor = mTexturePage.getColor(CurlPage.SIDE_FRONT); + } else { + v.mTexX *= mTextureRectBack.right; + v.mTexY *= mTextureRectBack.bottom; + v.mColor = mTexturePage.getColor(CurlPage.SIDE_BACK); + } + + // Move vertex back to 'world' coordinates. + v.rotateZ(curlAngle); + v.translate(curlPos.x, curlPos.y); + addVertex(v); + + // Drop shadow is cast 'behind' the curl. + if (DRAW_SHADOW && v.mPosZ > 0 && v.mPosZ <= radius) { + ShadowVertex sv = mArrTempShadowVertices.remove(0); + sv.mPosX = v.mPosX; + sv.mPosY = v.mPosY; + sv.mPosZ = v.mPosZ; + sv.mPenumbraX = (v.mPosZ / 2) * -curlDir.x; + sv.mPenumbraY = (v.mPosZ / 2) * -curlDir.y; + sv.mPenumbraColor = v.mPosZ / radius; + int idx = (mArrDropShadowVertices.size() + 1) / 2; + mArrDropShadowVertices.add(idx, sv); + } + // Self shadow is cast partly over mesh. + if (DRAW_SHADOW && v.mPosZ > radius) { + ShadowVertex sv = mArrTempShadowVertices.remove(0); + sv.mPosX = v.mPosX; + sv.mPosY = v.mPosY; + sv.mPosZ = v.mPosZ; + sv.mPenumbraX = ((v.mPosZ - radius) / 3) * v.mPenumbraX; + sv.mPenumbraY = ((v.mPosZ - radius) / 3) * v.mPenumbraY; + sv.mPenumbraColor = (v.mPosZ - radius) / (2 * radius); + int idx = (mArrSelfShadowVertices.size() + 1) / 2; + mArrSelfShadowVertices.add(idx, sv); + } + } + + // Switch scanXmin as scanXmax for next iteration. + scanXmax = scanXmin; + } + + mBufVertices.position(0); + mBufColors.position(0); + if (DRAW_TEXTURE) { + mBufTexCoords.position(0); + } + + // Add shadow Vertices. + if (DRAW_SHADOW) { + mBufShadowColors.position(0); + mBufShadowVertices.position(0); + mDropShadowCount = 0; + + for (int i = 0; i < mArrDropShadowVertices.size(); ++i) { + ShadowVertex sv = mArrDropShadowVertices.get(i); + mBufShadowVertices.put((float) sv.mPosX); + mBufShadowVertices.put((float) sv.mPosY); + mBufShadowVertices.put((float) sv.mPosZ); + mBufShadowVertices.put((float) (sv.mPosX + sv.mPenumbraX)); + mBufShadowVertices.put((float) (sv.mPosY + sv.mPenumbraY)); + mBufShadowVertices.put((float) sv.mPosZ); + for (int j = 0; j < 4; ++j) { + double color = SHADOW_OUTER_COLOR[j] + + (SHADOW_INNER_COLOR[j] - SHADOW_OUTER_COLOR[j]) + * sv.mPenumbraColor; + mBufShadowColors.put((float) color); + } + mBufShadowColors.put(SHADOW_OUTER_COLOR); + mDropShadowCount += 2; + } + mSelfShadowCount = 0; + for (int i = 0; i < mArrSelfShadowVertices.size(); ++i) { + ShadowVertex sv = mArrSelfShadowVertices.get(i); + mBufShadowVertices.put((float) sv.mPosX); + mBufShadowVertices.put((float) sv.mPosY); + mBufShadowVertices.put((float) sv.mPosZ); + mBufShadowVertices.put((float) (sv.mPosX + sv.mPenumbraX)); + mBufShadowVertices.put((float) (sv.mPosY + sv.mPenumbraY)); + mBufShadowVertices.put((float) sv.mPosZ); + for (int j = 0; j < 4; ++j) { + double color = SHADOW_OUTER_COLOR[j] + + (SHADOW_INNER_COLOR[j] - SHADOW_OUTER_COLOR[j]) + * sv.mPenumbraColor; + mBufShadowColors.put((float) color); + } + mBufShadowColors.put(SHADOW_OUTER_COLOR); + mSelfShadowCount += 2; + } + mBufShadowColors.position(0); + mBufShadowVertices.position(0); + } + } + + /** + * Calculates intersections for given scan line. + */ + private Array getIntersections(Array vertices, + int[][] lineIndices, double scanX) { + mArrIntersections.clear(); + // Iterate through rectangle lines each re-presented as a pair of + // vertices. + for (int j = 0; j < lineIndices.length; j++) { + Vertex v1 = vertices.get(lineIndices[j][0]); + Vertex v2 = vertices.get(lineIndices[j][1]); + // Here we expect that v1.mPosX >= v2.mPosX and wont do intersection + // test the opposite way. + if (v1.mPosX > scanX && v2.mPosX < scanX) { + // There is an intersection, calculate coefficient telling 'how + // far' scanX is from v2. + double c = (scanX - v2.mPosX) / (v1.mPosX - v2.mPosX); + Vertex n = mArrTempVertices.remove(0); + n.set(v2); + n.mPosX = scanX; + n.mPosY += (v1.mPosY - v2.mPosY) * c; + if (DRAW_TEXTURE) { + n.mTexX += (v1.mTexX - v2.mTexX) * c; + n.mTexY += (v1.mTexY - v2.mTexY) * c; + } + if (DRAW_SHADOW) { + n.mPenumbraX += (v1.mPenumbraX - v2.mPenumbraX) * c; + n.mPenumbraY += (v1.mPenumbraY - v2.mPenumbraY) * c; + } + mArrIntersections.add(n); + } + } + return mArrIntersections; + } + + /** + * Getter for textures page for this mesh. + */ + public synchronized CurlPage getTexturePage() { + return mTexturePage; + } + + /** + * Renders our page curl mesh. + */ + public synchronized void onDrawFrame(GL10 gl) { + // First allocate texture if there is not one yet. + if (DRAW_TEXTURE && mTextureIds == null) { + // Generate texture. + mTextureIds = new int[2]; + gl.glGenTextures(2, mTextureIds, 0); + for (int textureId : mTextureIds) { + // Set texture attributes. + gl.glBindTexture(GL10.GL_TEXTURE_2D, textureId); + gl.glTexParameterf(GL10.GL_TEXTURE_2D, + GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_NEAREST); + gl.glTexParameterf(GL10.GL_TEXTURE_2D, + GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_NEAREST); + gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, + GL10.GL_CLAMP_TO_EDGE); + gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, + GL10.GL_CLAMP_TO_EDGE); + } + } + + if (DRAW_TEXTURE && mTexturePage.getTexturesChanged()) { + gl.glBindTexture(GL10.GL_TEXTURE_2D, mTextureIds[0]); + Bitmap texture = mTexturePage.getTexture(mTextureRectFront, + CurlPage.SIDE_FRONT); + GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, texture, 0); + texture.recycle(); + + mTextureBack = mTexturePage.hasBackTexture(); + if (mTextureBack) { + gl.glBindTexture(GL10.GL_TEXTURE_2D, mTextureIds[1]); + texture = mTexturePage.getTexture(mTextureRectBack, + CurlPage.SIDE_BACK); + GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, texture, 0); + texture.recycle(); + } else { + mTextureRectBack.set(mTextureRectFront); + } + + mTexturePage.recycle(); + reset(); + } + + // Some 'global' settings. + gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); + + // TODO: Drop shadow drawing is done temporarily here to hide some + // problems with its calculation. + if (DRAW_SHADOW) { + gl.glDisable(GL10.GL_TEXTURE_2D); + gl.glEnable(GL10.GL_BLEND); + gl.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA); + gl.glEnableClientState(GL10.GL_COLOR_ARRAY); + gl.glColorPointer(4, GL10.GL_FLOAT, 0, mBufShadowColors); + gl.glVertexPointer(3, GL10.GL_FLOAT, 0, mBufShadowVertices); + gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, mDropShadowCount); + gl.glDisableClientState(GL10.GL_COLOR_ARRAY); + gl.glDisable(GL10.GL_BLEND); + } + + if (DRAW_TEXTURE) { + gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY); + gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, mBufTexCoords); + } + gl.glVertexPointer(3, GL10.GL_FLOAT, 0, mBufVertices); + // Enable color array. + gl.glEnableClientState(GL10.GL_COLOR_ARRAY); + gl.glColorPointer(4, GL10.GL_FLOAT, 0, mBufColors); + + // Draw front facing blank vertices. + gl.glDisable(GL10.GL_TEXTURE_2D); + gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, mVerticesCountFront); + + // Draw front facing texture. + if (DRAW_TEXTURE) { + gl.glEnable(GL10.GL_BLEND); + gl.glEnable(GL10.GL_TEXTURE_2D); + + if (!mFlipTexture || !mTextureBack) { + gl.glBindTexture(GL10.GL_TEXTURE_2D, mTextureIds[0]); + } else { + gl.glBindTexture(GL10.GL_TEXTURE_2D, mTextureIds[1]); + } + + gl.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA); + gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, mVerticesCountFront); + + gl.glDisable(GL10.GL_BLEND); + gl.glDisable(GL10.GL_TEXTURE_2D); + } + + int backStartIdx = Math.max(0, mVerticesCountFront - 2); + int backCount = mVerticesCountFront + mVerticesCountBack - backStartIdx; + + // Draw back facing blank vertices. + gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, backStartIdx, backCount); + + // Draw back facing texture. + if (DRAW_TEXTURE) { + gl.glEnable(GL10.GL_BLEND); + gl.glEnable(GL10.GL_TEXTURE_2D); + + if (mFlipTexture || !mTextureBack) { + gl.glBindTexture(GL10.GL_TEXTURE_2D, mTextureIds[0]); + } else { + gl.glBindTexture(GL10.GL_TEXTURE_2D, mTextureIds[1]); + } + + gl.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA); + gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, backStartIdx, backCount); + + gl.glDisable(GL10.GL_BLEND); + gl.glDisable(GL10.GL_TEXTURE_2D); + } + + // Disable textures and color array. + gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY); + gl.glDisableClientState(GL10.GL_COLOR_ARRAY); + + if (DRAW_POLYGON_OUTLINES) { + gl.glEnable(GL10.GL_BLEND); + gl.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA); + gl.glLineWidth(1.0f); + gl.glColor4f(0.5f, 0.5f, 1.0f, 1.0f); + gl.glVertexPointer(3, GL10.GL_FLOAT, 0, mBufVertices); + gl.glDrawArrays(GL10.GL_LINE_STRIP, 0, mVerticesCountFront); + gl.glDisable(GL10.GL_BLEND); + } + + if (DRAW_CURL_POSITION) { + gl.glEnable(GL10.GL_BLEND); + gl.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA); + gl.glLineWidth(1.0f); + gl.glColor4f(1.0f, 0.5f, 0.5f, 1.0f); + gl.glVertexPointer(2, GL10.GL_FLOAT, 0, mBufCurlPositionLines); + gl.glDrawArrays(GL10.GL_LINES, 0, mCurlPositionLinesCount * 2); + gl.glDisable(GL10.GL_BLEND); + } + + if (DRAW_SHADOW) { + gl.glEnable(GL10.GL_BLEND); + gl.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA); + gl.glEnableClientState(GL10.GL_COLOR_ARRAY); + gl.glColorPointer(4, GL10.GL_FLOAT, 0, mBufShadowColors); + gl.glVertexPointer(3, GL10.GL_FLOAT, 0, mBufShadowVertices); + gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, mDropShadowCount, + mSelfShadowCount); + gl.glDisableClientState(GL10.GL_COLOR_ARRAY); + gl.glDisable(GL10.GL_BLEND); + } + + gl.glDisableClientState(GL10.GL_VERTEX_ARRAY); + } + + /** + * Resets mesh to 'initial' state. Meaning this mesh will draw a plain + * textured rectangle after call to this method. + */ + public synchronized void reset() { + mBufVertices.position(0); + mBufColors.position(0); + if (DRAW_TEXTURE) { + mBufTexCoords.position(0); + } + for (int i = 0; i < 4; ++i) { + Vertex tmp = mArrTempVertices.get(0); + tmp.set(mRectangle[i]); + + if (mFlipTexture) { + tmp.mTexX *= mTextureRectBack.right; + tmp.mTexY *= mTextureRectBack.bottom; + tmp.mColor = mTexturePage.getColor(CurlPage.SIDE_BACK); + } else { + tmp.mTexX *= mTextureRectFront.right; + tmp.mTexY *= mTextureRectFront.bottom; + tmp.mColor = mTexturePage.getColor(CurlPage.SIDE_FRONT); + } + + addVertex(tmp); + } + mVerticesCountFront = 4; + mVerticesCountBack = 0; + mBufVertices.position(0); + mBufColors.position(0); + if (DRAW_TEXTURE) { + mBufTexCoords.position(0); + } + + mDropShadowCount = mSelfShadowCount = 0; + } + + /** + * Resets allocated texture id forcing creation of new one. After calling + * this method you most likely want to set bitmap too as it's lost. This + * method should be called only once e.g GL context is re-created as this + * method does not release previous texture id, only makes sure new one is + * requested on next render. + */ + public synchronized void resetTexture() { + mTextureIds = null; + } + + /** + * If true, flips texture sideways. + */ + public synchronized void setFlipTexture(boolean flipTexture) { + mFlipTexture = flipTexture; + if (flipTexture) { + setTexCoords(1f, 0f, 0f, 1f); + } else { + setTexCoords(0f, 0f, 1f, 1f); + } + } + + /** + * Update mesh bounds. + */ + public void setRect(RectF r) { + mRectangle[0].mPosX = r.left; + mRectangle[0].mPosY = r.top; + mRectangle[1].mPosX = r.left; + mRectangle[1].mPosY = r.bottom; + mRectangle[2].mPosX = r.right; + mRectangle[2].mPosY = r.top; + mRectangle[3].mPosX = r.right; + mRectangle[3].mPosY = r.bottom; + } + + /** + * Sets texture coordinates to mRectangle vertices. + */ + private synchronized void setTexCoords(float left, float top, float right, + float bottom) { + mRectangle[0].mTexX = left; + mRectangle[0].mTexY = top; + mRectangle[1].mTexX = left; + mRectangle[1].mTexY = bottom; + mRectangle[2].mTexX = right; + mRectangle[2].mTexY = top; + mRectangle[3].mTexX = right; + mRectangle[3].mTexY = bottom; + } + + /** + * Simple fixed size array implementation. + */ + private class Array { + private Object[] mArray; + private int mCapacity; + private int mSize; + + public Array(int capacity) { + mCapacity = capacity; + mArray = new Object[capacity]; + } + + public void add(int index, T item) { + if (index < 0 || index > mSize || mSize >= mCapacity) { + throw new IndexOutOfBoundsException(); + } + for (int i = mSize; i > index; --i) { + mArray[i] = mArray[i - 1]; + } + mArray[index] = item; + ++mSize; + } + + public void add(T item) { + if (mSize >= mCapacity) { + throw new IndexOutOfBoundsException(); + } + mArray[mSize++] = item; + } + + public void addAll(Array array) { + if (mSize + array.size() > mCapacity) { + throw new IndexOutOfBoundsException(); + } + for (int i = 0; i < array.size(); ++i) { + mArray[mSize++] = array.get(i); + } + } + + public void clear() { + mSize = 0; + } + + @SuppressWarnings("unchecked") + public T get(int index) { + if (index < 0 || index >= mSize) { + throw new IndexOutOfBoundsException(); + } + return (T) mArray[index]; + } + + @SuppressWarnings("unchecked") + public T remove(int index) { + if (index < 0 || index >= mSize) { + throw new IndexOutOfBoundsException(); + } + T item = (T) mArray[index]; + for (int i = index; i < mSize - 1; ++i) { + mArray[i] = mArray[i + 1]; + } + --mSize; + return item; + } + + public int size() { + return mSize; + } + + } + + /** + * Holder for shadow vertex information. + */ + private class ShadowVertex { + public double mPenumbraColor; + public double mPenumbraX; + public double mPenumbraY; + public double mPosX; + public double mPosY; + public double mPosZ; + } + + /** + * Holder for vertex information. + */ + private class Vertex { + public int mColor; + public float mColorFactor; + public double mPenumbraX; + public double mPenumbraY; + public double mPosX; + public double mPosY; + public double mPosZ; + public double mTexX; + public double mTexY; + + public Vertex() { + mPosX = mPosY = mPosZ = mTexX = mTexY = 0; + mColorFactor = 1.0f; + } + + public void rotateZ(double theta) { + double cos = Math.cos(theta); + double sin = Math.sin(theta); + double x = mPosX * cos + mPosY * sin; + double y = mPosX * -sin + mPosY * cos; + mPosX = x; + mPosY = y; + double px = mPenumbraX * cos + mPenumbraY * sin; + double py = mPenumbraX * -sin + mPenumbraY * cos; + mPenumbraX = px; + mPenumbraY = py; + } + + public void set(Vertex vertex) { + mPosX = vertex.mPosX; + mPosY = vertex.mPosY; + mPosZ = vertex.mPosZ; + mTexX = vertex.mTexX; + mTexY = vertex.mTexY; + mPenumbraX = vertex.mPenumbraX; + mPenumbraY = vertex.mPenumbraY; + mColor = vertex.mColor; + mColorFactor = vertex.mColorFactor; + } + + public void translate(double dx, double dy) { + mPosX += dx; + mPosY += dy; + } + } +} diff --git a/app/src/main/java/io/legado/app/ui/book/read/page/delegate/curl/CurlPage.java b/app/src/main/java/io/legado/app/ui/book/read/page/delegate/curl/CurlPage.java new file mode 100644 index 000000000..0caa17010 --- /dev/null +++ b/app/src/main/java/io/legado/app/ui/book/read/page/delegate/curl/CurlPage.java @@ -0,0 +1,195 @@ +package io.legado.app.ui.book.read.page.delegate.curl; + +import android.graphics.Bitmap; +import android.graphics.Canvas; +import android.graphics.Color; +import android.graphics.RectF; + +/** + * Storage class for page textures, blend colors and possibly some other values + * in the future. + * + * @author harism + */ +public class CurlPage { + + public static final int SIDE_BACK = 2; + public static final int SIDE_BOTH = 3; + public static final int SIDE_FRONT = 1; + + private int mColorBack; + private int mColorFront; + private Bitmap mTextureBack; + private Bitmap mTextureFront; + private boolean mTexturesChanged; + + /** + * Default constructor. + */ + public CurlPage() { + reset(); + } + + /** + * Getter for color. + */ + public int getColor(int side) { + switch (side) { + case SIDE_FRONT: + return mColorFront; + default: + return mColorBack; + } + } + + /** + * Calculates the next highest power of two for a given integer. + */ + private int getNextHighestPO2(int n) { + n -= 1; + n = n | (n >> 1); + n = n | (n >> 2); + n = n | (n >> 4); + n = n | (n >> 8); + n = n | (n >> 16); + n = n | (n >> 32); + return n + 1; + } + + /** + * Generates nearest power of two sized Bitmap for give Bitmap. Returns this + * new Bitmap using default return statement + original texture coordinates + * are stored into RectF. + */ + private Bitmap getTexture(Bitmap bitmap, RectF textureRect) { + // Bitmap original size. + int w = bitmap.getWidth(); + int h = bitmap.getHeight(); + // Bitmap size expanded to next power of two. This is done due to + // the requirement on many devices, texture width and height should + // be power of two. + int newW = getNextHighestPO2(w); + int newH = getNextHighestPO2(h); + + // TODO: Is there another way to create a bigger Bitmap and copy + // original Bitmap to it more efficiently? Immutable bitmap anyone? + Bitmap bitmapTex = Bitmap.createBitmap(newW, newH, bitmap.getConfig()); + Canvas c = new Canvas(bitmapTex); + c.drawBitmap(bitmap, 0, 0, null); + + // Calculate final texture coordinates. + float texX = (float) w / newW; + float texY = (float) h / newH; + textureRect.set(0f, 0f, texX, texY); + + return bitmapTex; + } + + /** + * Getter for textures. Creates Bitmap sized to nearest power of two, copies + * original Bitmap into it and returns it. RectF given as parameter is + * filled with actual texture coordinates in this new upscaled texture + * Bitmap. + */ + public Bitmap getTexture(RectF textureRect, int side) { + switch (side) { + case SIDE_FRONT: + return getTexture(mTextureFront, textureRect); + default: + return getTexture(mTextureBack, textureRect); + } + } + + /** + * Returns true if textures have changed. + */ + public boolean getTexturesChanged() { + return mTexturesChanged; + } + + /** + * Returns true if back siding texture exists and it differs from front + * facing one. + */ + public boolean hasBackTexture() { + return !mTextureFront.equals(mTextureBack); + } + + /** + * Recycles and frees underlying Bitmaps. + */ + public void recycle() { + if (mTextureFront != null) { + mTextureFront.recycle(); + } + mTextureFront = Bitmap.createBitmap(1, 1, Bitmap.Config.RGB_565); + mTextureFront.eraseColor(mColorFront); + if (mTextureBack != null) { + mTextureBack.recycle(); + } + mTextureBack = Bitmap.createBitmap(1, 1, Bitmap.Config.RGB_565); + mTextureBack.eraseColor(mColorBack); + mTexturesChanged = false; + } + + /** + * Resets this CurlPage into its initial state. + */ + public void reset() { + mColorBack = Color.WHITE; + mColorFront = Color.WHITE; + recycle(); + } + + /** + * Setter blend color. + */ + public void setColor(int color, int side) { + switch (side) { + case SIDE_FRONT: + mColorFront = color; + break; + case SIDE_BACK: + mColorBack = color; + break; + default: + mColorFront = mColorBack = color; + break; + } + } + + /** + * Setter for textures. + */ + public void setTexture(Bitmap texture, int side) { + if (texture == null) { + texture = Bitmap.createBitmap(1, 1, Bitmap.Config.RGB_565); + if (side == SIDE_BACK) { + texture.eraseColor(mColorBack); + } else { + texture.eraseColor(mColorFront); + } + } + switch (side) { + case SIDE_FRONT: + if (mTextureFront != null) + mTextureFront.recycle(); + mTextureFront = texture; + break; + case SIDE_BACK: + if (mTextureBack != null) + mTextureBack.recycle(); + mTextureBack = texture; + break; + case SIDE_BOTH: + if (mTextureFront != null) + mTextureFront.recycle(); + if (mTextureBack != null) + mTextureBack.recycle(); + mTextureFront = mTextureBack = texture; + break; + } + mTexturesChanged = true; + } + +}