Adjust atlas sizes to fix Mali400 precision issues

src/gpu/GrFontAtlasSizes.h

Index: src/gpu/GrFontAtlasSizes.h
diff --git a/src/gpu/GrFontAtlasSizes.h b/src/gpu/GrFontAtlasSizes.h
index 5a1821cdcebd3c821c7adced02e3ef40266c599e..d5c5e287e184e30bda772f74a4daf41dd5ee7639 100644
--- a/src/gpu/GrFontAtlasSizes.h
+++ b/src/gpu/GrFontAtlasSizes.h
@@ -9,27 +9,25 @@
 #ifndef GrFontAtlasSizes_DEFINED
 #define GrFontAtlasSizes_DEFINED
 
-#include "SkDistanceFieldGen.h"
+#define GR_FONT_ATLAS_TEXTURE_WIDTH    1024
+#define GR_FONT_ATLAS_A8_TEXTURE_WIDTH 2048
+#define GR_FONT_ATLAS_TEXTURE_HEIGHT   2048
 
-#define GR_SDF_MAX_SIZE              156
+#define GR_FONT_ATLAS_PLOT_WIDTH       256
+#define GR_FONT_ATLAS_A8_PLOT_WIDTH    512
+#define GR_FONT_ATLAS_PLOT_HEIGHT      256
 
-// allows us to fit four of the largest distance field glyphs
-#define GR_FONT_ATLAS_PLOT_WIDTH     (2*(GR_SDF_MAX_SIZE+2*SK_DistanceFieldPad))
-#define GR_FONT_ATLAS_PLOT_HEIGHT    (2*(GR_SDF_MAX_SIZE+2*SK_DistanceFieldPad))
-
-#define GR_FONT_ATLAS_NUM_PLOTS_X    5
-#define GR_FONT_ATLAS_NUM_PLOTS_Y    6
-
-#define GR_FONT_ATLAS_TEXTURE_WIDTH  (GR_FONT_ATLAS_PLOT_WIDTH*GR_FONT_ATLAS_NUM_PLOTS_X)
-SK_COMPILE_ASSERT(GR_FONT_ATLAS_TEXTURE_WIDTH == 1640, font_atlas_unexpected_size);
-#define GR_FONT_ATLAS_TEXTURE_HEIGHT (GR_FONT_ATLAS_PLOT_HEIGHT*GR_FONT_ATLAS_NUM_PLOTS_Y)
-SK_COMPILE_ASSERT(GR_FONT_ATLAS_TEXTURE_HEIGHT == 1968, font_atlas_unexpected_size);
+#define GR_FONT_ATLAS_NUM_PLOTS_X     (GR_FONT_ATLAS_TEXTURE_WIDTH / GR_FONT_ATLAS_PLOT_WIDTH)
+#define GR_FONT_ATLAS_A8_NUM_PLOTS_X  (GR_FONT_ATLAS_A8_TEXTURE_WIDTH / GR_FONT_ATLAS_A8_PLOT_WIDTH)
+#define GR_FONT_ATLAS_NUM_PLOTS_Y     (GR_FONT_ATLAS_TEXTURE_HEIGHT / GR_FONT_ATLAS_PLOT_HEIGHT)
 
 // one over width and height
-#define GR_FONT_ATLAS_RECIP_WIDTH    "0.00060975609"
-#define GR_FONT_ATLAS_RECIP_HEIGHT   "0.00050813008"
+#define GR_FONT_ATLAS_RECIP_WIDTH      "0.0009765625"
+#define GR_FONT_ATLAS_A8_RECIP_WIDTH   "0.00048828125"
+#define GR_FONT_ATLAS_RECIP_HEIGHT     "0.00048828125"
 
 // 1/(3*width)
-#define GR_FONT_ATLAS_LCD_DELTA      "0.00020325203"
+// only used for distance fields, which are A8
+#define GR_FONT_ATLAS_LCD_DELTA        "0.000162760417"
 
 #endif