SkPDF: fix large-number bug

Example:
        https://fiddle.skia.org/c/db95a3f6c928017635c4f4ddf25f2a7b

BUG=skia:257

Review URL: https://codereview.chromium.org/1438503002

1 files changed, 135 insertions, 0 deletions

diff --git a/gm/skbug_257.cpp b/gm/skbug_257.cpp
new file mode 100644
index 0000000000..052884236a
--- /dev/null
+++ b/gm/skbug_257.cpp
@@ -0,0 +1,135 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "gm.h"
+#include "SkImage.h"
+#include "SkRRect.h"
+
+static void rotated_checkerboard_shader(SkPaint* paint,
+                                        SkColor c1,
+                                        SkColor c2,
+                                        int size) {
+    SkBitmap bm;
+    bm.allocN32Pixels(2 * size, 2 * size);
+    bm.eraseColor(c1);
+    bm.eraseArea(SkIRect::MakeLTRB(0, 0, size, size), c2);
+    bm.eraseArea(SkIRect::MakeLTRB(size, size, 2 * size, 2 * size), c2);
+    SkMatrix matrix;
+    matrix.setScale(0.75f, 0.75f);
+    matrix.preRotate(30.0f);
+    SkAutoTUnref<SkShader> shader(
+            SkShader::CreateBitmapShader(bm, SkShader::kRepeat_TileMode,
+                                         SkShader::kRepeat_TileMode, &matrix));
+    paint->setShader(shader);
+}
+
+static void exercise_draw_pos_text(SkCanvas* canvas,
+                                   const char* text,
+                                   SkScalar x, SkScalar y,
+                                   const SkPaint& paint) {
+    size_t textLen = strlen(text);
+    int count = paint.countText(text, textLen);
+    SkAutoTArray<SkScalar> widths(count);
+    paint.getTextWidths(text, textLen, &widths[0]);
+    SkAutoTArray<SkPoint> pos(count);
+    for (int i = 0; i < count; ++i) {
+        pos[i].set(x, y);
+        x += widths[i];
+    }
+    canvas->drawPosText(text, textLen, &pos[0], paint);
+}
+
+static void exercise_draw_pos_text_h(SkCanvas* canvas,
+                                     const char* text,
+                                     SkScalar x, SkScalar y,
+                                     const SkPaint& paint) {
+    size_t textLen = strlen(text);
+    int count = paint.countText(text, textLen);
+    SkAutoTArray<SkScalar> widths(count);
+    paint.getTextWidths(text, textLen, &widths[0]);
+    SkAutoTArray<SkScalar> pos(count);
+    for (int i = 0; i < count; ++i) {
+        pos[i] = x;
+        x += widths[i];
+    }
+    canvas->drawPosTextH(text, textLen, &pos[0], y, paint);
+}
+
+static void test_text(SkCanvas* canvas, SkScalar size,
+                      SkColor color, SkScalar Y) {
+    SkPaint type;
+    type.setTextSize(24);
+    sk_tool_utils::set_portable_typeface(&type);
+    type.setColor(color);
+    const char text[] = "HELLO WORLD";
+    canvas->drawText(text, strlen(text), 32, size / 2 + Y, type);
+    SkScalar lineSpacing = type.getFontSpacing();
+    exercise_draw_pos_text(canvas, text, 32, size / 2 + Y + lineSpacing, type);
+    exercise_draw_pos_text_h(canvas, text, 32,
+                             size / 2 + Y + 2 * lineSpacing, type);
+}
+
+// If this GM works correctly, the cyan layer should be lined up with
+// the objects below it.
+DEF_SIMPLE_GM(skbug_257, canvas, 512, 512) {
+    const SkScalar size = 256;
+    SkAutoCanvasRestore autoCanvasRestore0(canvas, true);
+    const SkScalar scale = 1.00168f;
+    canvas->scale(scale, scale);
+    {
+        SkPaint checker;
+        rotated_checkerboard_shader(&checker, SK_ColorWHITE, SK_ColorBLACK, 16);
+        checker.setAntiAlias(true);
+
+        SkAutoCanvasRestore autoCanvasRestore(canvas, true);
+        canvas->clear(0xFFCECFCE);
+        SkScalar translate = 225364.0f;
+        canvas->translate(0, -translate);
+
+        // Test rects
+        SkRect rect = SkRect::MakeLTRB(8, 8 + translate, size - 8,
+                                       size - 8 + translate);
+        canvas->drawRect(rect, checker);
+
+        // Test Paths
+        canvas->translate(size, 0);
+        SkRRect rrect;
+        SkVector radii[4] = {{40, 40}, {40, 40}, {40, 40}, {40, 40}};
+        rrect.setRectRadii(rect, radii);
+        canvas->drawRRect(rrect, checker);
+
+        // Test Points
+        canvas->translate(-size, size);
+        SkScalar delta = 1.0 / 64.0;
+        SkPoint points[8] = {{size / 2, 8 + translate},
+                             {size / 2, 8 + translate + delta},
+                             {8, size / 2 + translate},
+                             {8, size / 2 + translate + delta},
+                             {size / 2, size - 8 + translate},
+                             {size / 2, size - 8 + translate + delta},
+                             {size - 8, size / 2 + translate},
+                             {size - 8, size / 2 + translate + delta}};
+        checker.setStyle(SkPaint::kStroke_Style);
+        checker.setStrokeWidth(8);
+        checker.setStrokeCap(SkPaint::kRound_Cap);
+        canvas->drawPoints(SkCanvas::kLines_PointMode, 8, points, checker);
+
+        // Test Text
+        canvas->translate(size, 0);
+        test_text(canvas, size, SK_ColorBLACK, translate);
+    }
+    // reference points (without the huge translations).
+    SkPaint stroke;
+    stroke.setStyle(SkPaint::kStroke_Style);
+    stroke.setStrokeWidth(5);
+    stroke.setColor(SK_ColorCYAN);
+    canvas->drawCircle(size / 2, size / 2, size / 2 - 10, stroke);
+    canvas->drawCircle(3 * size / 2, size / 2, size / 2 - 10, stroke);
+    canvas->drawCircle(size / 2, 384, size / 2 - 10, stroke);
+    canvas->translate(size, size);
+    test_text(canvas, size, SK_ColorCYAN, 0.0f);
+}