Add m-esr52 at 52.6.0

1 files changed, 288 insertions, 0 deletions

diff --git a/gfx/thebes/gfxFontMissingGlyphs.cpp b/gfx/thebes/gfxFontMissingGlyphs.cpp
new file mode 100644
index 000000000..92ea5e967
--- /dev/null
+++ b/gfx/thebes/gfxFontMissingGlyphs.cpp
@@ -0,0 +1,288 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * 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 "gfxFontMissingGlyphs.h"
+
+#include "gfxUtils.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/gfx/Helpers.h"
+#include "mozilla/gfx/PathHelpers.h"
+#include "mozilla/RefPtr.h"
+#include "nsDeviceContext.h"
+#include "nsLayoutUtils.h"
+
+using namespace mozilla;
+using namespace mozilla::gfx;
+
+#define CHAR_BITS(b00, b01, b02, b10, b11, b12, b20, b21, b22, b30, b31, b32, b40, b41, b42) \
+  ((b00 << 0) | (b01 << 1) | (b02 << 2) | (b10 << 3) | (b11 << 4) | (b12 << 5) | \
+   (b20 << 6) | (b21 << 7) | (b22 << 8) | (b30 << 9) | (b31 << 10) | (b32 << 11) | \
+   (b40 << 12) | (b41 << 13) | (b42 << 14))
+
+static const uint16_t glyphMicroFont[16] = {
+  CHAR_BITS(0, 1, 0,
+            1, 0, 1,
+            1, 0, 1,
+            1, 0, 1,
+            0, 1, 0),
+  CHAR_BITS(0, 1, 0,
+            0, 1, 0,
+            0, 1, 0,
+            0, 1, 0,
+            0, 1, 0),
+  CHAR_BITS(1, 1, 1,
+            0, 0, 1,
+            1, 1, 1,
+            1, 0, 0,
+            1, 1, 1),
+  CHAR_BITS(1, 1, 1,
+            0, 0, 1,
+            1, 1, 1,
+            0, 0, 1,
+            1, 1, 1),
+  CHAR_BITS(1, 0, 1,
+            1, 0, 1,
+            1, 1, 1,
+            0, 0, 1,
+            0, 0, 1),
+  CHAR_BITS(1, 1, 1,
+            1, 0, 0,
+            1, 1, 1,
+            0, 0, 1,
+            1, 1, 1),
+  CHAR_BITS(1, 1, 1,
+            1, 0, 0,
+            1, 1, 1,
+            1, 0, 1,
+            1, 1, 1),
+  CHAR_BITS(1, 1, 1,
+            0, 0, 1,
+            0, 0, 1,
+            0, 0, 1,
+            0, 0, 1),
+  CHAR_BITS(0, 1, 0,
+            1, 0, 1,
+            0, 1, 0,
+            1, 0, 1,
+            0, 1, 0),
+  CHAR_BITS(1, 1, 1,
+            1, 0, 1,
+            1, 1, 1,
+            0, 0, 1,
+            0, 0, 1),
+  CHAR_BITS(1, 1, 1,
+            1, 0, 1,
+            1, 1, 1,
+            1, 0, 1,
+            1, 0, 1),
+  CHAR_BITS(1, 1, 0,
+            1, 0, 1,
+            1, 1, 0,
+            1, 0, 1,
+            1, 1, 0),
+  CHAR_BITS(0, 1, 1,
+            1, 0, 0,
+            1, 0, 0,
+            1, 0, 0,
+            0, 1, 1),
+  CHAR_BITS(1, 1, 0,
+            1, 0, 1,
+            1, 0, 1,
+            1, 0, 1,
+            1, 1, 0),
+  CHAR_BITS(1, 1, 1,
+            1, 0, 0,
+            1, 1, 1,
+            1, 0, 0,
+            1, 1, 1),
+  CHAR_BITS(1, 1, 1,
+            1, 0, 0,
+            1, 1, 1,
+            1, 0, 0,
+            1, 0, 0)
+};
+
+/* Parameters that control the rendering of hexboxes. They look like this:
+
+        BMP codepoints           non-BMP codepoints
+      (U+0000 - U+FFFF)         (U+10000 - U+10FFFF)
+
+         +---------+              +-------------+ 
+         |         |              |             |
+         | HHH HHH |              | HHH HHH HHH |
+         | HHH HHH |              | HHH HHH HHH |
+         | HHH HHH |              | HHH HHH HHH |
+         | HHH HHH |              | HHH HHH HHH |
+         | HHH HHH |              | HHH HHH HHH |
+         |         |              |             |
+         | HHH HHH |              | HHH HHH HHH |
+         | HHH HHH |              | HHH HHH HHH |
+         | HHH HHH |              | HHH HHH HHH |
+         | HHH HHH |              | HHH HHH HHH |
+         | HHH HHH |              | HHH HHH HHH |
+         |         |              |             |
+         +---------+              +-------------+
+*/
+
+/** Width of a minifont glyph (see above) */
+static const int MINIFONT_WIDTH = 3;
+/** Height of a minifont glyph (see above) */
+static const int MINIFONT_HEIGHT = 5;
+/**
+ * Gap between minifont glyphs (both horizontal and vertical) and also
+ * the minimum desired gap between the box border and the glyphs
+ */
+static const int HEX_CHAR_GAP = 1;
+/**
+ * The amount of space between the vertical edge of the glyphbox and the
+ * box border. We make this nonzero so that when multiple missing glyphs
+ * occur consecutively there's a gap between their rendered boxes.
+ */
+static const int BOX_HORIZONTAL_INSET = 1;
+/** The width of the border */
+static const int BOX_BORDER_WIDTH = 1;
+/**
+ * The scaling factor for the border opacity; this is multiplied by the current
+ * opacity being used to draw the text.
+ */
+static const Float BOX_BORDER_OPACITY = 0.5;
+/**
+ * Draw a single hex character using the current color. A nice way to do this
+ * would be to fill in an A8 image surface and then use it as a mask
+ * to paint the current color. Tragically this doesn't currently work with the
+ * Quartz cairo backend which doesn't generally support masking with surfaces.
+ * So for now we just paint a bunch of rectangles...
+ */
+#ifndef MOZ_GFX_OPTIMIZE_MOBILE
+static void
+DrawHexChar(uint32_t aDigit, const Point& aPt, DrawTarget& aDrawTarget,
+            const Pattern &aPattern)
+{
+    // To avoid the potential for seams showing between rects when we're under
+    // a transform we concat all the rects into a PathBuilder and fill the
+    // resulting Path (rather than using DrawTarget::FillRect).
+    RefPtr<PathBuilder> builder = aDrawTarget.CreatePathBuilder();
+    uint32_t glyphBits = glyphMicroFont[aDigit];
+    for (int y = 0; y < MINIFONT_HEIGHT; ++y) {
+        for (int x = 0; x < MINIFONT_WIDTH; ++x) {
+            if (glyphBits & 1) {
+                Rect r(aPt.x + x, aPt.y + y, 1, 1);
+                MaybeSnapToDevicePixels(r, aDrawTarget, true);
+                builder->MoveTo(r.TopLeft());
+                builder->LineTo(r.TopRight());
+                builder->LineTo(r.BottomRight());
+                builder->LineTo(r.BottomLeft());
+                builder->Close();
+            }
+            glyphBits >>= 1;
+        }
+    }
+    RefPtr<Path> path = builder->Finish();
+    aDrawTarget.Fill(path, aPattern);
+}
+#endif // MOZ_GFX_OPTIMIZE_MOBILE
+
+void
+gfxFontMissingGlyphs::DrawMissingGlyph(uint32_t aChar,
+                                       const Rect& aRect,
+                                       DrawTarget& aDrawTarget,
+                                       const Pattern& aPattern,
+                                       uint32_t aAppUnitsPerDevPixel)
+{
+    // If we're currently drawing with some kind of pattern, we just draw the
+    // missing-glyph data in black.
+    ColorPattern color = aPattern.GetType() == PatternType::COLOR ?
+        static_cast<const ColorPattern&>(aPattern) :
+        ColorPattern(ToDeviceColor(Color(0.f, 0.f, 0.f, 1.f)));
+
+    // Stroke a rectangle so that the stroke's left edge is inset one pixel
+    // from the left edge of the glyph box and the stroke's right edge
+    // is inset one pixel from the right edge of the glyph box.
+    Float halfBorderWidth = BOX_BORDER_WIDTH / 2.0;
+    Float borderLeft = aRect.X() + BOX_HORIZONTAL_INSET + halfBorderWidth;
+    Float borderRight = aRect.XMost() - BOX_HORIZONTAL_INSET - halfBorderWidth;
+    Rect borderStrokeRect(borderLeft, aRect.Y() + halfBorderWidth,
+                          borderRight - borderLeft,
+                          aRect.Height() - 2.0 * halfBorderWidth);
+    if (!borderStrokeRect.IsEmpty()) {
+        ColorPattern adjustedColor = color;
+        color.mColor.a *= BOX_BORDER_OPACITY;
+#ifdef MOZ_GFX_OPTIMIZE_MOBILE
+        aDrawTarget.FillRect(borderStrokeRect, adjustedColor);
+#else
+        StrokeOptions strokeOptions(BOX_BORDER_WIDTH);
+        aDrawTarget.StrokeRect(borderStrokeRect, adjustedColor, strokeOptions);
+#endif
+    }
+
+#ifndef MOZ_GFX_OPTIMIZE_MOBILE
+    Point center = aRect.Center();
+    Float halfGap = HEX_CHAR_GAP / 2.f;
+    Float top = -(MINIFONT_HEIGHT + halfGap);
+    // We always want integer scaling, otherwise the "bitmap" glyphs will look
+    // even uglier than usual when zoomed
+    int32_t devPixelsPerCSSPx =
+        std::max<int32_t>(1, nsDeviceContext::AppUnitsPerCSSPixel() /
+                             aAppUnitsPerDevPixel);
+    AutoRestoreTransform autoRestoreTransform(&aDrawTarget);
+    aDrawTarget.SetTransform(
+      aDrawTarget.GetTransform().PreTranslate(center).
+                                 PreScale(devPixelsPerCSSPx,
+                                          devPixelsPerCSSPx));
+    if (aChar < 0x10000) {
+        if (aRect.Width() >= 2 * (MINIFONT_WIDTH + HEX_CHAR_GAP) &&
+            aRect.Height() >= 2 * MINIFONT_HEIGHT + HEX_CHAR_GAP) {
+            // Draw 4 digits for BMP
+            Float left = -(MINIFONT_WIDTH + halfGap);
+            DrawHexChar((aChar >> 12) & 0xF,
+                        Point(left, top), aDrawTarget, color);
+            DrawHexChar((aChar >> 8) & 0xF,
+                        Point(halfGap, top), aDrawTarget, color);
+            DrawHexChar((aChar >> 4) & 0xF,
+                        Point(left, halfGap), aDrawTarget, color);
+            DrawHexChar(aChar & 0xF,
+                        Point(halfGap, halfGap), aDrawTarget, color);
+        }
+    } else {
+        if (aRect.Width() >= 3 * (MINIFONT_WIDTH + HEX_CHAR_GAP) &&
+            aRect.Height() >= 2 * MINIFONT_HEIGHT + HEX_CHAR_GAP) {
+            // Draw 6 digits for non-BMP
+            Float first = -(MINIFONT_WIDTH * 1.5 + HEX_CHAR_GAP);
+            Float second = -(MINIFONT_WIDTH / 2.0);
+            Float third = (MINIFONT_WIDTH / 2.0 + HEX_CHAR_GAP);
+            DrawHexChar((aChar >> 20) & 0xF,
+                        Point(first, top), aDrawTarget, color);
+            DrawHexChar((aChar >> 16) & 0xF,
+                        Point(second, top), aDrawTarget, color);
+            DrawHexChar((aChar >> 12) & 0xF,
+                        Point(third, top), aDrawTarget, color);
+            DrawHexChar((aChar >> 8) & 0xF,
+                        Point(first, halfGap), aDrawTarget, color);
+            DrawHexChar((aChar >> 4) & 0xF,
+                        Point(second, halfGap), aDrawTarget, color);
+            DrawHexChar(aChar & 0xF,
+                        Point(third, halfGap), aDrawTarget, color);
+        }
+    }
+#endif
+}
+
+Float
+gfxFontMissingGlyphs::GetDesiredMinWidth(uint32_t aChar,
+                                         uint32_t aAppUnitsPerDevPixel)
+{
+/**
+ * The minimum desired width for a missing-glyph glyph box. I've laid it out
+ * like this so you can see what goes where.
+ */
+    Float width = BOX_HORIZONTAL_INSET + BOX_BORDER_WIDTH + HEX_CHAR_GAP +
+        MINIFONT_WIDTH + HEX_CHAR_GAP + MINIFONT_WIDTH +
+         ((aChar < 0x10000) ? 0 : HEX_CHAR_GAP + MINIFONT_WIDTH) +
+        HEX_CHAR_GAP + BOX_BORDER_WIDTH + BOX_HORIZONTAL_INSET;
+    // Note that this will give us floating-point division, so the width will
+    // -not- be snapped to integer multiples of its basic pixel value
+    width *= Float(nsDeviceContext::AppUnitsPerCSSPixel()) / aAppUnitsPerDevPixel;
+    return width;
+}