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-rw-r--r--core/fxge/cfx_facecache.cpp55
1 files changed, 52 insertions, 3 deletions
diff --git a/core/fxge/cfx_facecache.cpp b/core/fxge/cfx_facecache.cpp
index 3f037ac65a..a3e58ff29c 100644
--- a/core/fxge/cfx_facecache.cpp
+++ b/core/fxge/cfx_facecache.cpp
@@ -35,8 +35,48 @@ namespace {
constexpr uint32_t kInvalidGlyphIndex = static_cast<uint32_t>(-1);
+constexpr int kMinPixel = 0;
+constexpr int kMaxPixel = 255;
+
constexpr int kMaxGlyphDimension = 2048;
+void ContrastAdjust(uint8_t* pDataIn,
+ uint8_t* pDataOut,
+ int nWidth,
+ int nHeight,
+ int nSrcRowBytes,
+ int nDstRowBytes) {
+ int max = kMinPixel;
+ int min = kMaxPixel;
+ for (int row = 0; row < nHeight; row++) {
+ uint8_t* pRow = pDataIn + row * nSrcRowBytes;
+ for (int col = 0; col < nWidth; col++) {
+ int val = pRow[col];
+ max = std::max(val, max);
+ min = std::min(val, min);
+ }
+ }
+ int diff = max - min;
+ if (diff == kMinPixel || diff == kMaxPixel) {
+ int rowbytes = std::min(abs(nSrcRowBytes), nDstRowBytes);
+ for (int row = 0; row < nHeight; row++) {
+ memcpy(pDataOut + row * nDstRowBytes, pDataIn + row * nSrcRowBytes,
+ rowbytes);
+ }
+ return;
+ }
+ float rate = 255.f / diff;
+ for (int row = 0; row < nHeight; row++) {
+ uint8_t* pSrcRow = pDataIn + row * nSrcRowBytes;
+ uint8_t* pDstRow = pDataOut + row * nDstRowBytes;
+ for (int col = 0; col < nWidth; col++) {
+ int val = static_cast<int>((pSrcRow[col] - min) * rate + 0.5);
+ pDstRow[col] =
+ static_cast<uint8_t>(pdfium::clamp(val, kMinPixel, kMaxPixel));
+ }
+ }
+}
+
struct UniqueKeyGen {
void Generate(int count, ...);
@@ -184,9 +224,18 @@ std::unique_ptr<CFX_GlyphBitmap> CFX_FaceCache::RenderGlyph(
}
} else {
memset(pDestBuf, 0, dest_pitch * bmheight);
- int rowbytes = std::min(abs(src_pitch), dest_pitch);
- for (int row = 0; row < bmheight; row++)
- memcpy(pDestBuf + row * dest_pitch, pSrcBuf + row * src_pitch, rowbytes);
+ if (anti_alias == FXFT_RENDER_MODE_MONO &&
+ FXFT_Get_Bitmap_PixelMode(FXFT_Get_Glyph_Bitmap(m_Face)) ==
+ FXFT_PIXEL_MODE_MONO) {
+ int rowbytes = abs(src_pitch) > dest_pitch ? dest_pitch : abs(src_pitch);
+ for (int row = 0; row < bmheight; row++) {
+ memcpy(pDestBuf + row * dest_pitch, pSrcBuf + row * src_pitch,
+ rowbytes);
+ }
+ } else {
+ ContrastAdjust(pSrcBuf, pDestBuf, bmwidth, bmheight, src_pitch,
+ dest_pitch);
+ }
}
return pGlyphBitmap;
}