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support BW text

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git-svn-id: http://skia.googlecode.com/svn/trunk@1053 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
reed@google.com 2011-04-05 13:05:32 +00:00
parent 6115338c59
commit 261c20a122
1 changed files with 31 additions and 0 deletions
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31
src/ports/SkFontHost_mac_coretext.cpp
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@ -439,6 +439,19 @@ void SkScalerContext_Mac::generateMetrics(SkGlyph* glyph)
#include "SkColorPriv.h"
static void bytes_to_bits(uint8_t dst[], const uint8_t src[], int count) {
while (count > 0) {
uint8_t mask = 0;
for (int i = 7; i >= 0; --i) {
mask |= (*src++ >> 7) << i;
if (0 == --count) {
break;
}
}
*dst++ = mask;
}
}
static inline uint16_t rgb_to_lcd16(uint32_t rgb) {
int r = (rgb >> 16) & 0xFF;
int g = (rgb >> 8) & 0xFF;
@ -474,6 +487,7 @@ void SkScalerContext_Mac::generateImage(const SkGlyph& glyph) {
void* image = glyph.fImage;
size_t rowBytes = glyph.rowBytes();
float grayColor = 1; // white
bool doAA = true;
/* For LCD16, we first create a temp offscreen cg-context in 32bit,
* erase to white, and then draw a black glyph into it. Then we can
@ -490,6 +504,12 @@ void SkScalerContext_Mac::generateImage(const SkGlyph& glyph) {
// we draw black-on-white (and invert in rgb_to_lcd16)
sk_memset32((uint32_t*)image, 0xFFFFFFFF, size >> 2);
grayColor = 0; // black
} else if (SkMask::kBW_Format == glyph.fMaskFormat) {
rowBytes = SkAlign4(glyph.fWidth);
size_t size = glyph.fHeight * rowBytes;
image = storage.realloc(size);
sk_bzero(image, size);
doAA = false;
}
cgContext = CGBitmapContextCreate(image, glyph.fWidth, glyph.fHeight, 8,
@ -501,6 +521,7 @@ void SkScalerContext_Mac::generateImage(const SkGlyph& glyph) {
CGContextSetAllowsFontSubpixelQuantization(cgContext, true);
CGContextSetShouldSubpixelQuantizeFonts(cgContext, true);
#endif
CGContextSetShouldAntialias(cgContext, doAA);
CGContextSetGrayFillColor( cgContext, grayColor, 1.0);
CGContextSetTextDrawingMode(cgContext, kCGTextFill);
CGContextSetFont( cgContext, cgFont);
@ -521,6 +542,16 @@ void SkScalerContext_Mac::generateImage(const SkGlyph& glyph) {
src = (const uint32_t*)((const char*)src + rowBytes);
dst = (uint16_t*)((char*)dst + dstRB);
}
} else if (SkMask::kBW_Format == glyph.fMaskFormat) {
// downsample from A8 to A1
const uint8_t* src = (const uint8_t*)image;
uint8_t* dst = (uint8_t*)glyph.fImage;
size_t dstRB = glyph.rowBytes();
for (int y = 0; y < glyph.fHeight; y++) {
bytes_to_bits(dst, src, glyph.fWidth);
src += rowBytes;
dst += dstRB;
}
}
}