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170 lines
8.4 KiB
Diff
170 lines
8.4 KiB
Diff
From 6cdb5f2ad7684302a8a66217462d2aef4c5f4632 Mon Sep 17 00:00:00 2001
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From: Ben Wagner <bungeman@behemoth.cnc.corp.google.com>
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Date: Thu, 15 Jun 2017 10:43:17 -0400
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Subject: [PATCH] Clip FreeType glyph bitmap to mask.
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Skia has for some time assumed that when using FT_Render_Glyph with one
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of the LCD render modes that one extra pixel would be applied to each
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side of the resulting bitmap. FreieType has changed to make this more
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conservative when possible, so the pre-allocated SkMask and the generated
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FT_Bitmap may no longer agree on the size and origin.
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This change ensures the SkMask and FT_Bitmap are the same size and their
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origins align. This is not an ideal long term fix, but is both simple and
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localized for easy and quick back-porting, should that become necessary.
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BUG=skia:6663
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Change-Id: I49ec8f45376be8d867e8aef54eab79537731c310
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Reviewed-on: https://skia-review.googlesource.com/20327
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Reviewed-by: Herb Derby <herb@google.com>
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Commit-Queue: Ben Wagner <bungeman@google.com>
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---
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src/ports/SkFontHost_FreeType_common.cpp | 100 +++++++++++++++++++++++++------
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1 file changed, 83 insertions(+), 17 deletions(-)
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diff --git a/src/ports/SkFontHost_FreeType_common.cpp b/src/ports/SkFontHost_FreeType_common.cpp
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index 9df7268bb4..a216fdb29c 100644
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--- a/src/ports/SkFontHost_FreeType_common.cpp
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+++ b/src/ports/SkFontHost_FreeType_common.cpp
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@@ -395,8 +395,6 @@ void SkScalerContext_FreeType_Base::generateGlyphImage(
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switch ( face->glyph->format ) {
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case FT_GLYPH_FORMAT_OUTLINE: {
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FT_Outline* outline = &face->glyph->outline;
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- FT_BBox bbox;
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- FT_Bitmap target;
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int dx = 0, dy = 0;
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if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) {
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@@ -405,36 +403,97 @@ void SkScalerContext_FreeType_Base::generateGlyphImage(
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// negate dy since freetype-y-goes-up and skia-y-goes-down
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dy = -dy;
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}
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- FT_Outline_Get_CBox(outline, &bbox);
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- /*
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- what we really want to do for subpixel is
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- offset(dx, dy)
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- compute_bounds
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- offset(bbox & !63)
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- but that is two calls to offset, so we do the following, which
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- achieves the same thing with only one offset call.
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- */
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- FT_Outline_Translate(outline, dx - ((bbox.xMin + dx) & ~63),
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- dy - ((bbox.yMin + dy) & ~63));
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+
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+ memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight);
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if (SkMask::kLCD16_Format == glyph.fMaskFormat) {
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+ FT_Outline_Translate(outline, dx, dy);
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FT_Error err = FT_Render_Glyph(face->glyph, doVert ? FT_RENDER_MODE_LCD_V :
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FT_RENDER_MODE_LCD);
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if (err) {
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SK_TRACEFTR(err, "Could not render glyph.");
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- sk_bzero(glyph.fImage, glyph.computeImageSize());
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return;
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}
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+
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SkMask mask;
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glyph.toMask(&mask);
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+#ifdef SK_SHOW_TEXT_BLIT_COVERAGE
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+ memset(mask.fImage, 0x80, mask.fBounds.height() * mask.fRowBytes);
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+#endif
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+ FT_GlyphSlotRec& ftGlyph = *face->glyph;
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+
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+ if (!SkIRect::Intersects(mask.fBounds,
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+ SkIRect::MakeXYWH( ftGlyph.bitmap_left,
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+ -ftGlyph.bitmap_top,
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+ ftGlyph.bitmap.width,
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+ ftGlyph.bitmap.rows)))
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+ {
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+ return;
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+ }
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+
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+ // If the FT_Bitmap extent is larger, discard bits of the bitmap outside the mask.
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+ // If the SkMask extent is larger, shrink mask to fit bitmap (clearing discarded).
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+ unsigned char* origBuffer = ftGlyph.bitmap.buffer;
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+ // First align the top left (origin).
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+ if (-ftGlyph.bitmap_top < mask.fBounds.fTop) {
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+ int32_t topDiff = mask.fBounds.fTop - (-ftGlyph.bitmap_top);
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+ ftGlyph.bitmap.buffer += ftGlyph.bitmap.pitch * topDiff;
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+ ftGlyph.bitmap.rows -= topDiff;
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+ ftGlyph.bitmap_top = -mask.fBounds.fTop;
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+ }
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+ if (ftGlyph.bitmap_left < mask.fBounds.fLeft) {
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+ int32_t leftDiff = mask.fBounds.fLeft - ftGlyph.bitmap_left;
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+ ftGlyph.bitmap.buffer += leftDiff;
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+ ftGlyph.bitmap.width -= leftDiff;
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+ ftGlyph.bitmap_left = mask.fBounds.fLeft;
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+ }
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+ if (mask.fBounds.fTop < -ftGlyph.bitmap_top) {
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+ mask.fImage += mask.fRowBytes * (-ftGlyph.bitmap_top - mask.fBounds.fTop);
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+ mask.fBounds.fTop = -ftGlyph.bitmap_top;
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+ }
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+ if (mask.fBounds.fLeft < ftGlyph.bitmap_left) {
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+ mask.fImage += sizeof(uint16_t) * (ftGlyph.bitmap_left - mask.fBounds.fLeft);
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+ mask.fBounds.fLeft = ftGlyph.bitmap_left;
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+ }
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+ // Origins aligned, clean up the width and height.
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+ int ftVertScale = (doVert ? 3 : 1);
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+ int ftHoriScale = (doVert ? 1 : 3);
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+ if (mask.fBounds.height() * ftVertScale < SkToInt(ftGlyph.bitmap.rows)) {
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+ ftGlyph.bitmap.rows = mask.fBounds.height() * ftVertScale;
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+ }
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+ if (mask.fBounds.width() * ftHoriScale < SkToInt(ftGlyph.bitmap.width)) {
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+ ftGlyph.bitmap.width = mask.fBounds.width() * ftHoriScale;
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+ }
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+ if (SkToInt(ftGlyph.bitmap.rows) < mask.fBounds.height() * ftVertScale) {
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+ mask.fBounds.fBottom = mask.fBounds.fTop + ftGlyph.bitmap.rows / ftVertScale;
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+ }
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+ if (SkToInt(ftGlyph.bitmap.width) < mask.fBounds.width() * ftHoriScale) {
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+ mask.fBounds.fRight = mask.fBounds.fLeft + ftGlyph.bitmap.width / ftHoriScale;
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+ }
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if (fPreBlend.isApplicable()) {
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- copyFT2LCD16<true>(face->glyph->bitmap, mask, doBGR,
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+ copyFT2LCD16<true>(ftGlyph.bitmap, mask, doBGR,
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fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
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} else {
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- copyFT2LCD16<false>(face->glyph->bitmap, mask, doBGR,
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+ copyFT2LCD16<false>(ftGlyph.bitmap, mask, doBGR,
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fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
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}
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+ // Restore the buffer pointer so FreeType can properly free it.
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+ ftGlyph.bitmap.buffer = origBuffer;
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} else {
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+ FT_BBox bbox;
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+ FT_Bitmap target;
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+ FT_Outline_Get_CBox(outline, &bbox);
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+ /*
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+ what we really want to do for subpixel is
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+ offset(dx, dy)
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+ compute_bounds
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+ offset(bbox & !63)
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+ but that is two calls to offset, so we do the following, which
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+ achieves the same thing with only one offset call.
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+ */
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+ FT_Outline_Translate(outline, dx - ((bbox.xMin + dx) & ~63),
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+ dy - ((bbox.yMin + dy) & ~63));
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+
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target.width = glyph.fWidth;
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target.rows = glyph.fHeight;
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target.pitch = glyph.rowBytes();
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@@ -442,8 +501,15 @@ void SkScalerContext_FreeType_Base::generateGlyphImage(
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target.pixel_mode = compute_pixel_mode( (SkMask::Format)fRec.fMaskFormat);
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target.num_grays = 256;
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- memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight);
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FT_Outline_Get_Bitmap(face->glyph->library, outline, &target);
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+#ifdef SK_SHOW_TEXT_BLIT_COVERAGE
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+ for (int y = 0; y < glyph.fHeight; ++y) {
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+ for (int x = 0; x < glyph.fWidth; ++x) {
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+ uint8_t& a = ((uint8_t*)glyph.fImage)[(glyph.rowBytes() * y) + x];
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+ a = SkTMax<uint8_t>(a, 0x20);
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+ }
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+ }
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+#endif
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}
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} break;
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--
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2.13.2
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