diff options
Diffstat (limited to 'clip-ft-glyph.diff')
| -rw-r--r-- | clip-ft-glyph.diff | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/clip-ft-glyph.diff b/clip-ft-glyph.diff new file mode 100644 index 000000000000..4ca703504364 --- /dev/null +++ b/clip-ft-glyph.diff @@ -0,0 +1,162 @@ +# HG changeset patch +# User Lee Salzman <lsalzman@mozilla.com> +# Date 1504120456 14400 +# Wed Aug 30 15:14:16 2017 -0400 +# Node ID 708d52f954b6d7ca2497fcb5b5084c6483300e89 +# Parent 33224536ce20d942576cd4b9ffb350d6dce397bc +clip FreeType glyph bitmap to mask in Skia + +MozReview-Commit-ID: 9NqLj9SkHFo + +diff --git a/gfx/skia/skia/src/ports/SkFontHost_FreeType_common.cpp b/gfx/skia/skia/src/ports/SkFontHost_FreeType_common.cpp +--- a/gfx/skia/skia/src/ports/SkFontHost_FreeType_common.cpp ++++ b/gfx/skia/skia/src/ports/SkFontHost_FreeType_common.cpp +@@ -390,65 +390,131 @@ void SkScalerContext_FreeType_Base::gene + const SkMatrix& bitmapTransform) + { + const bool doBGR = SkToBool(fRec.fFlags & SkScalerContext::kLCD_BGROrder_Flag); + const bool doVert = SkToBool(fRec.fFlags & SkScalerContext::kLCD_Vertical_Flag); + + switch ( face->glyph->format ) { + case FT_GLYPH_FORMAT_OUTLINE: { + FT_Outline* outline = &face->glyph->outline; +- FT_BBox bbox; +- FT_Bitmap target; + + int dx = 0, dy = 0; + if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) { + dx = SkFixedToFDot6(glyph.getSubXFixed()); + dy = SkFixedToFDot6(glyph.getSubYFixed()); + // negate dy since freetype-y-goes-up and skia-y-goes-down + dy = -dy; + } +- FT_Outline_Get_CBox(outline, &bbox); +- /* +- what we really want to do for subpixel is +- offset(dx, dy) +- compute_bounds +- offset(bbox & !63) +- but that is two calls to offset, so we do the following, which +- achieves the same thing with only one offset call. +- */ +- FT_Outline_Translate(outline, dx - ((bbox.xMin + dx) & ~63), +- dy - ((bbox.yMin + dy) & ~63)); ++ ++ memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight); + + if (SkMask::kLCD16_Format == glyph.fMaskFormat) { ++ FT_Outline_Translate(outline, dx, dy); + FT_Error err = FT_Render_Glyph(face->glyph, doVert ? FT_RENDER_MODE_LCD_V : + FT_RENDER_MODE_LCD); + if (err) { + SK_TRACEFTR(err, "Could not render glyph."); +- sk_bzero(glyph.fImage, glyph.computeImageSize()); + return; + } ++ + SkMask mask; + glyph.toMask(&mask); ++#ifdef SK_SHOW_TEXT_BLIT_COVERAGE ++ memset(mask.fImage, 0x80, mask.fBounds.height() * mask.fRowBytes); ++#endif ++ FT_GlyphSlotRec& ftGlyph = *face->glyph; ++ ++ if (!SkIRect::Intersects(mask.fBounds, ++ SkIRect::MakeXYWH( ftGlyph.bitmap_left, ++ -ftGlyph.bitmap_top, ++ ftGlyph.bitmap.width, ++ ftGlyph.bitmap.rows))) ++ { ++ return; ++ } ++ ++ // If the FT_Bitmap extent is larger, discard bits of the bitmap outside the mask. ++ // If the SkMask extent is larger, shrink mask to fit bitmap (clearing discarded). ++ unsigned char* origBuffer = ftGlyph.bitmap.buffer; ++ // First align the top left (origin). ++ if (-ftGlyph.bitmap_top < mask.fBounds.fTop) { ++ int32_t topDiff = mask.fBounds.fTop - (-ftGlyph.bitmap_top); ++ ftGlyph.bitmap.buffer += ftGlyph.bitmap.pitch * topDiff; ++ ftGlyph.bitmap.rows -= topDiff; ++ ftGlyph.bitmap_top = -mask.fBounds.fTop; ++ } ++ if (ftGlyph.bitmap_left < mask.fBounds.fLeft) { ++ int32_t leftDiff = mask.fBounds.fLeft - ftGlyph.bitmap_left; ++ ftGlyph.bitmap.buffer += leftDiff; ++ ftGlyph.bitmap.width -= leftDiff; ++ ftGlyph.bitmap_left = mask.fBounds.fLeft; ++ } ++ if (mask.fBounds.fTop < -ftGlyph.bitmap_top) { ++ mask.fImage += mask.fRowBytes * (-ftGlyph.bitmap_top - mask.fBounds.fTop); ++ mask.fBounds.fTop = -ftGlyph.bitmap_top; ++ } ++ if (mask.fBounds.fLeft < ftGlyph.bitmap_left) { ++ mask.fImage += sizeof(uint16_t) * (ftGlyph.bitmap_left - mask.fBounds.fLeft); ++ mask.fBounds.fLeft = ftGlyph.bitmap_left; ++ } ++ // Origins aligned, clean up the width and height. ++ int ftVertScale = (doVert ? 3 : 1); ++ int ftHoriScale = (doVert ? 1 : 3); ++ if (mask.fBounds.height() * ftVertScale < SkToInt(ftGlyph.bitmap.rows)) { ++ ftGlyph.bitmap.rows = mask.fBounds.height() * ftVertScale; ++ } ++ if (mask.fBounds.width() * ftHoriScale < SkToInt(ftGlyph.bitmap.width)) { ++ ftGlyph.bitmap.width = mask.fBounds.width() * ftHoriScale; ++ } ++ if (SkToInt(ftGlyph.bitmap.rows) < mask.fBounds.height() * ftVertScale) { ++ mask.fBounds.fBottom = mask.fBounds.fTop + ftGlyph.bitmap.rows / ftVertScale; ++ } ++ if (SkToInt(ftGlyph.bitmap.width) < mask.fBounds.width() * ftHoriScale) { ++ mask.fBounds.fRight = mask.fBounds.fLeft + ftGlyph.bitmap.width / ftHoriScale; ++ } + if (fPreBlend.isApplicable()) { +- copyFT2LCD16<true>(face->glyph->bitmap, mask, doBGR, ++ copyFT2LCD16<true>(ftGlyph.bitmap, mask, doBGR, + fPreBlend.fR, fPreBlend.fG, fPreBlend.fB); + } else { +- copyFT2LCD16<false>(face->glyph->bitmap, mask, doBGR, ++ copyFT2LCD16<false>(ftGlyph.bitmap, mask, doBGR, + fPreBlend.fR, fPreBlend.fG, fPreBlend.fB); + } ++ // Restore the buffer pointer so FreeType can properly free it. ++ ftGlyph.bitmap.buffer = origBuffer; + } else { ++ FT_BBox bbox; ++ FT_Bitmap target; ++ FT_Outline_Get_CBox(outline, &bbox); ++ /* ++ what we really want to do for subpixel is ++ offset(dx, dy) ++ compute_bounds ++ offset(bbox & !63) ++ but that is two calls to offset, so we do the following, which ++ achieves the same thing with only one offset call. ++ */ ++ FT_Outline_Translate(outline, dx - ((bbox.xMin + dx) & ~63), ++ dy - ((bbox.yMin + dy) & ~63)); ++ + target.width = glyph.fWidth; + target.rows = glyph.fHeight; + target.pitch = glyph.rowBytes(); + target.buffer = reinterpret_cast<uint8_t*>(glyph.fImage); + target.pixel_mode = compute_pixel_mode( (SkMask::Format)fRec.fMaskFormat); + target.num_grays = 256; + +- memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight); + FT_Outline_Get_Bitmap(face->glyph->library, outline, &target); ++#ifdef SK_SHOW_TEXT_BLIT_COVERAGE ++ for (int y = 0; y < glyph.fHeight; ++y) { ++ for (int x = 0; x < glyph.fWidth; ++x) { ++ uint8_t& a = ((uint8_t*)glyph.fImage)[(glyph.rowBytes() * y) + x]; ++ a = SkTMax<uint8_t>(a, 0x20); ++ } ++ } ++#endif + } + } break; + + case FT_GLYPH_FORMAT_BITMAP: { + FT_Pixel_Mode pixel_mode = static_cast<FT_Pixel_Mode>(face->glyph->bitmap.pixel_mode); + SkMask::Format maskFormat = static_cast<SkMask::Format>(glyph.fMaskFormat); + + // Assume that the other formats do not exist. |