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detect when LCD is really just BW, and remark the glyph as that.

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allows us to take a much faster blitter.
TODO: inform SkGlyphCache of this, so it can shrink its allocation
for the image buffer (since BW takes up 1/16 as much ram)
TODO(2): allow for A8->BW conversion my having scalercontext set a flag
if it really-wants A8 (i.e. we have a maskfilter)



git-svn-id: http://skia.googlecode.com/svn/trunk@2301 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
reed@google.com 2011-09-21 18:42:09 +00:00
parent 98b11f1c21
commit 5e2df64215
2 changed files with 129 additions and 30 deletions
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4
src/core/SkGlyphCache.cpp
View File

@ -293,6 +293,10 @@ const void* SkGlyphCache::findImage(const SkGlyph& glyph) {
// check that alloc() actually succeeded // check that alloc() actually succeeded
if (glyph.fImage) { if (glyph.fImage) {
fScalerContext->getImage(glyph); fScalerContext->getImage(glyph);
// TODO: the scaler may have changed the maskformat during
// getImage (e.g. from AA or LCD to BW) which means we may have
// overallocated the buffer. Check if the new computedImageSize
// is smaller, and if so, strink the alloc size in fImageAlloc.
fMemoryUsed += size; fMemoryUsed += size;
} }
} }

147
src/ports/SkFontHost_win.cpp
View File

@ -600,10 +600,12 @@ void SkScalerContext_Windows::generateMetrics(SkGlyph* glyph) {
// correspond to an embedded bitmap font, but not sure. // correspond to an embedded bitmap font, but not sure.
// LayoutTests/fast/text/backslash-to-yen-sign-euc.html // LayoutTests/fast/text/backslash-to-yen-sign-euc.html
// //
if (glyph->fWidth) { // don't outset an empty glyph
glyph->fWidth += 4; glyph->fWidth += 4;
glyph->fHeight += 4; glyph->fHeight += 4;
glyph->fTop -= 2; glyph->fTop -= 2;
glyph->fLeft -= 2; glyph->fLeft -= 2;
}
if (fHiResFont) { if (fHiResFont) {
SelectObject(fDDC, fHiResFont); SelectObject(fDDC, fHiResFont);
@ -658,15 +660,19 @@ void SkScalerContext_Windows::generateFontMetrics(SkPaint::FontMetrics* mx, SkPa
#include "SkColorPriv.h" #include "SkColorPriv.h"
static inline uint8_t rgb_to_a8(uint32_t rgb) { // always packed xxRRGGBB
// can pick any component, since we're grayscale typedef uint32_t SkGdiRGB;
int r = (rgb >> 16) & 0xFF;
// invert, since we draw black-on-white, but we want the original // gdi's bitmap is upside-down, so we reverse dst walking in Y
// src mask values. // whenever we copy it into skia's buffer
return 255 - r;
static inline uint8_t rgb_to_a8(SkGdiRGB rgb) {
// can pick any component (low 3 bytes), since we're grayscale
// but must invert since we draw black-on-white
return ~rgb & 0xFF;
} }
static inline uint16_t rgb_to_lcd16(uint32_t rgb) { static inline uint16_t rgb_to_lcd16(SkGdiRGB rgb) {
rgb = ~rgb; // 255 - each component rgb = ~rgb; // 255 - each component
int r = (rgb >> 16) & 0xFF; int r = (rgb >> 16) & 0xFF;
int g = (rgb >> 8) & 0xFF; int g = (rgb >> 8) & 0xFF;
@ -674,6 +680,99 @@ static inline uint16_t rgb_to_lcd16(uint32_t rgb) {
return SkPackRGB16(SkR32ToR16(r), SkG32ToG16(g), SkB32ToB16(b)); return SkPackRGB16(SkR32ToR16(r), SkG32ToG16(g), SkB32ToB16(b));
} }
static bool is_black_or_white(SkGdiRGB c) {
c &= 0x00FFFFFF;
bool isBW = 0 == c || 0x00FFFFFF == c;
bool isBW2 = 0 == ((c + (c & 1)) & 0x00FFFFFF);
SkASSERT(isBW == isBW2);
return isBW;
}
static bool is_rgb_really_bw(const SkGdiRGB* src, int width, int height, int srcRB) {
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
if (!is_black_or_white(src[x])) {
return false;
}
}
src = (const SkGdiRGB*)((const char*)src + srcRB);
}
return true;
}
static void rgb_to_bw(const SkGdiRGB* SK_RESTRICT src, size_t srcRB,
const SkGlyph& glyph) {
const int width = glyph.fWidth;
const size_t dstRB = (width + 7) >> 3;
uint8_t* SK_RESTRICT dst = (uint8_t*)((char*)glyph.fImage + (glyph.fHeight - 1) * dstRB);
int byteCount = width >> 3;
int bitCount = width & 7;
// adjust srcRB to skip the values in our byteCount loop,
// since we increment src locally there
srcRB -= byteCount * 8 * sizeof(SkGdiRGB);
for (int y = 0; y < glyph.fHeight; ++y) {
if (byteCount > 0) {
unsigned byte = 0;
for (int i = 0; i < byteCount; ++i) {
byte |= src[0] & (1 << 7);
byte |= src[1] & (1 << 6);
byte |= src[2] & (1 << 5);
byte |= src[3] & (1 << 4);
byte |= src[4] & (1 << 3);
byte |= src[5] & (1 << 2);
byte |= src[6] & (1 << 1);
byte |= src[7] & (1 << 0);
dst[i] = ~byte;
src += 8;
}
}
if (bitCount > 0) {
unsigned byte = 0;
unsigned mask = 0x80;
for (int i = 0; i < bitCount; i++) {
byte |= ~src[i] & mask;
mask >>= 1;
}
dst[byteCount] = byte;
}
src = (const SkGdiRGB*)((const char*)src + srcRB);
dst -= dstRB;
}
}
static void rgb_to_a8(const SkGdiRGB* SK_RESTRICT src, size_t srcRB,
const SkGlyph& glyph) {
const size_t dstRB = glyph.rowBytes();
const int width = glyph.fWidth;
uint8_t* SK_RESTRICT dst = (uint8_t*)((char*)glyph.fImage + (glyph.fHeight - 1) * dstRB);
for (int y = 0; y < glyph.fHeight; y++) {
for (int i = 0; i < width; i++) {
dst[i] = rgb_to_a8(src[i]);
}
src = (const SkGdiRGB*)((const char*)src + srcRB);
dst -= dstRB;
}
}
static void rgb_to_lcd16(const SkGdiRGB* SK_RESTRICT src, size_t srcRB,
const SkGlyph& glyph) {
const size_t dstRB = glyph.rowBytes();
const int width = glyph.fWidth;
uint16_t* SK_RESTRICT dst = (uint16_t*)((char*)glyph.fImage + (glyph.fHeight - 1) * dstRB);
for (int y = 0; y < glyph.fHeight; y++) {
for (int i = 0; i < width; i++) {
dst[i] = rgb_to_lcd16(src[i]);
}
src = (const SkGdiRGB*)((const char*)src + srcRB);
dst = (uint16_t*)((char*)dst - dstRB);
}
}
void SkScalerContext_Windows::generateImage(const SkGlyph& glyph) { void SkScalerContext_Windows::generateImage(const SkGlyph& glyph) {
SkAutoMutexAcquire ac(gFTMutex); SkAutoMutexAcquire ac(gFTMutex);
@ -694,7 +793,6 @@ void SkScalerContext_Windows::generateImage(const SkGlyph& glyph) {
size_t dstRB = glyph.rowBytes(); size_t dstRB = glyph.rowBytes();
if (isBW) { if (isBW) {
const uint8_t* src = (const uint8_t*)bits; const uint8_t* src = (const uint8_t*)bits;
// gdi's bitmap is upside-down, so we reverse dst walking in Y
uint8_t* dst = (uint8_t*)((char*)glyph.fImage + (glyph.fHeight - 1) * dstRB); uint8_t* dst = (uint8_t*)((char*)glyph.fImage + (glyph.fHeight - 1) * dstRB);
for (int y = 0; y < glyph.fHeight; y++) { for (int y = 0; y < glyph.fHeight; y++) {
memcpy(dst, src, dstRB); memcpy(dst, src, dstRB);
@ -702,26 +800,23 @@ void SkScalerContext_Windows::generateImage(const SkGlyph& glyph) {
dst -= dstRB; dst -= dstRB;
} }
} else if (isAA) { } else if (isAA) {
const uint32_t* src = (const uint32_t*)bits; const SkGdiRGB* src = (const SkGdiRGB*)bits;
// gdi's bitmap is upside-down, so we reverse dst walking in Y #if 0 // can't do this (yet) since caller may really want gray8 for maskfilters
uint8_t* dst = (uint8_t*)((char*)glyph.fImage + (glyph.fHeight - 1) * dstRB); if (is_rgb_really_bw(src, width, glyph.fHeight, srcRB)) {
for (int y = 0; y < glyph.fHeight; y++) { rgb_to_bw(src, srcRB, glyph);
for (int i = 0; i < width; i++) { ((SkGlyph*)&glyph)->fMaskFormat = SkMask::kBW_Format;
dst[i] = rgb_to_a8(src[i]); } else
} #endif
src = (const uint32_t*)((const char*)src + srcRB); {
dst -= dstRB; rgb_to_a8(src, srcRB, glyph);
} }
} else { // LCD16 } else { // LCD16
const uint32_t* src = (const uint32_t*)bits; const SkGdiRGB* src = (const SkGdiRGB*)bits;
// gdi's bitmap is upside-down, so we reverse dst walking in Y if (is_rgb_really_bw(src, width, glyph.fHeight, srcRB)) {
uint16_t* dst = (uint16_t*)((char*)glyph.fImage + (glyph.fHeight - 1) * dstRB); rgb_to_bw(src, srcRB, glyph);
for (int y = 0; y < glyph.fHeight; y++) { ((SkGlyph*)&glyph)->fMaskFormat = SkMask::kBW_Format;
for (int i = 0; i < width; i++) { } else {
dst[i] = rgb_to_lcd16(src[i]); rgb_to_lcd16(src, srcRB, glyph);
}
src = (const uint32_t*)((const char*)src + srcRB);
dst = (uint16_t*)((char*)dst - dstRB);
} }
} }
} }