Add m-esr52 at 52.6.0

1 files changed, 173 insertions, 0 deletions

diff --git a/gfx/gl/DecomposeIntoNoRepeatTriangles.cpp b/gfx/gl/DecomposeIntoNoRepeatTriangles.cpp
new file mode 100644
index 000000000..829c20187
--- /dev/null
+++ b/gfx/gl/DecomposeIntoNoRepeatTriangles.cpp
@@ -0,0 +1,173 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* vim: set ts=8 sts=4 et sw=4 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "DecomposeIntoNoRepeatTriangles.h"
+#include "gfxMatrix.h"
+
+namespace mozilla {
+namespace gl {
+
+void
+RectTriangles::AppendRectToCoordArray(InfallibleTArray<coord>& array,
+                                      GLfloat x0, GLfloat y0,
+                                      GLfloat x1, GLfloat y1)
+{
+    coord* v = array.AppendElements(6);
+
+    v[0].x = x0; v[0].y = y0;
+    v[1].x = x1; v[1].y = y0;
+    v[2].x = x0; v[2].y = y1;
+    v[3].x = x0; v[3].y = y1;
+    v[4].x = x1; v[4].y = y0;
+    v[5].x = x1; v[5].y = y1;
+}
+
+void
+RectTriangles::addRect(GLfloat x0, GLfloat y0, GLfloat x1, GLfloat y1,
+                       GLfloat tx0, GLfloat ty0, GLfloat tx1, GLfloat ty1,
+                       bool flip_y /* = false */)
+{
+    if (flip_y) {
+        std::swap(ty0, ty1);
+    }
+    AppendRectToCoordArray(mVertexCoords, x0, y0, x1, y1);
+    AppendRectToCoordArray(mTexCoords, tx0, ty0, tx1, ty1);
+}
+
+static GLfloat
+WrapTexCoord(GLfloat v)
+{
+    // This should return values in range [0, 1.0)
+    return v - floorf(v);
+}
+
+void
+DecomposeIntoNoRepeatTriangles(const gfx::IntRect& aTexCoordRect,
+                               const gfx::IntSize& aTexSize,
+                               RectTriangles& aRects,
+                               bool aFlipY /* = false */)
+{
+    // normalize this
+    gfx::IntRect tcr(aTexCoordRect);
+    while (tcr.x >= aTexSize.width)
+        tcr.x -= aTexSize.width;
+    while (tcr.y >= aTexSize.height)
+        tcr.y -= aTexSize.height;
+
+    // Compute top left and bottom right tex coordinates
+    GLfloat tl[2] =
+        { GLfloat(tcr.x) / GLfloat(aTexSize.width),
+          GLfloat(tcr.y) / GLfloat(aTexSize.height) };
+    GLfloat br[2] =
+        { GLfloat(tcr.XMost()) / GLfloat(aTexSize.width),
+          GLfloat(tcr.YMost()) / GLfloat(aTexSize.height) };
+
+    // then check if we wrap in either the x or y axis; if we do,
+    // then also use fmod to figure out the "true" non-wrapping
+    // texture coordinates.
+
+    bool xwrap = false, ywrap = false;
+    if (tcr.x < 0 || tcr.x > aTexSize.width ||
+        tcr.XMost() < 0 || tcr.XMost() > aTexSize.width)
+    {
+        xwrap = true;
+        tl[0] = WrapTexCoord(tl[0]);
+        br[0] = WrapTexCoord(br[0]);
+    }
+
+    if (tcr.y < 0 || tcr.y > aTexSize.height ||
+        tcr.YMost() < 0 || tcr.YMost() > aTexSize.height)
+    {
+        ywrap = true;
+        tl[1] = WrapTexCoord(tl[1]);
+        br[1] = WrapTexCoord(br[1]);
+    }
+
+    NS_ASSERTION(tl[0] >= 0.0f && tl[0] <= 1.0f &&
+                 tl[1] >= 0.0f && tl[1] <= 1.0f &&
+                 br[0] >= 0.0f && br[0] <= 1.0f &&
+                 br[1] >= 0.0f && br[1] <= 1.0f,
+                 "Somehow generated invalid texture coordinates");
+
+    // If xwrap is false, the texture will be sampled from tl[0]
+    // .. br[0].  If xwrap is true, then it will be split into tl[0]
+    // .. 1.0, and 0.0 .. br[0].  Same for the Y axis.  The
+    // destination rectangle is also split appropriately, according
+    // to the calculated xmid/ymid values.
+
+    // There isn't a 1:1 mapping between tex coords and destination coords;
+    // when computing midpoints, we have to take that into account.  We
+    // need to map the texture coords, which are (in the wrap case):
+    // |tl->1| and |0->br| to the |0->1| range of the vertex coords.  So
+    // we have the length (1-tl)+(br) that needs to map into 0->1.
+    // These are only valid if there is wrap involved, they won't be used
+    // otherwise.
+    GLfloat xlen = (1.0f - tl[0]) + br[0];
+    GLfloat ylen = (1.0f - tl[1]) + br[1];
+
+    NS_ASSERTION(!xwrap || xlen > 0.0f, "xlen isn't > 0, what's going on?");
+    NS_ASSERTION(!ywrap || ylen > 0.0f, "ylen isn't > 0, what's going on?");
+    NS_ASSERTION(aTexCoordRect.width <= aTexSize.width &&
+                 aTexCoordRect.height <= aTexSize.height, "tex coord rect would cause tiling!");
+
+    if (!xwrap && !ywrap) {
+        aRects.addRect(0.0f, 0.0f,
+                       1.0f, 1.0f,
+                       tl[0], tl[1],
+                       br[0], br[1],
+                       aFlipY);
+    } else if (!xwrap && ywrap) {
+        GLfloat ymid = (1.0f - tl[1]) / ylen;
+        aRects.addRect(0.0f, 0.0f,
+                       1.0f, ymid,
+                       tl[0], tl[1],
+                       br[0], 1.0f,
+                       aFlipY);
+        aRects.addRect(0.0f, ymid,
+                       1.0f, 1.0f,
+                       tl[0], 0.0f,
+                       br[0], br[1],
+                       aFlipY);
+    } else if (xwrap && !ywrap) {
+        GLfloat xmid = (1.0f - tl[0]) / xlen;
+        aRects.addRect(0.0f, 0.0f,
+                       xmid, 1.0f,
+                       tl[0], tl[1],
+                       1.0f, br[1],
+                       aFlipY);
+        aRects.addRect(xmid, 0.0f,
+                       1.0f, 1.0f,
+                       0.0f, tl[1],
+                       br[0], br[1],
+                       aFlipY);
+    } else {
+        GLfloat xmid = (1.0f - tl[0]) / xlen;
+        GLfloat ymid = (1.0f - tl[1]) / ylen;
+        aRects.addRect(0.0f, 0.0f,
+                       xmid, ymid,
+                       tl[0], tl[1],
+                       1.0f, 1.0f,
+                       aFlipY);
+        aRects.addRect(xmid, 0.0f,
+                       1.0f, ymid,
+                       0.0f, tl[1],
+                       br[0], 1.0f,
+                       aFlipY);
+        aRects.addRect(0.0f, ymid,
+                       xmid, 1.0f,
+                       tl[0], 0.0f,
+                       1.0f, br[1],
+                       aFlipY);
+        aRects.addRect(xmid, ymid,
+                       1.0f, 1.0f,
+                       0.0f, 0.0f,
+                       br[0], br[1],
+                       aFlipY);
+    }
+}
+
+} // namespace gl
+} // namespace mozilla