GrAtlasManager.cpp File Reference

#include "src/gpu/ganesh/text/GrAtlasManager.h"
#include "include/core/SkColorType.h"
#include "include/core/SkSize.h"
#include "include/core/SkSpan.h"
#include "include/private/base/SkMalloc.h"
#include "include/private/base/SkTLogic.h"
#include "src/base/SkAutoMalloc.h"
#include "src/core/SkDistanceFieldGen.h"
#include "src/core/SkGlyph.h"
#include "src/core/SkMask.h"
#include "src/core/SkMasks.h"
#include "src/core/SkStrikeSpec.h"
#include "src/gpu/ganesh/GrColor.h"
#include "src/gpu/ganesh/GrDeferredUpload.h"
#include "src/gpu/ganesh/GrMeshDrawTarget.h"
#include "src/text/gpu/Glyph.h"
#include "src/text/gpu/GlyphVector.h"
#include "src/text/gpu/StrikeCache.h"
#include <cstring>
#include <tuple>

Go to the source code of this file.

Namespaces
namespace	sktext
namespace	sktext::gpu

Typedefs
using	Glyph = sktext::gpu::Glyph
using	MaskFormat = skgpu::MaskFormat

Functions
template<typename INT_TYPE >
static void	expand_bits (INT_TYPE *dst, const uint8_t *src, int width, int height, int dstRowBytes, int srcRowBytes)
static void	get_packed_glyph_image (const SkGlyph &glyph, int dstRB, MaskFormat expectedMaskFormat, void *dst)

Typedef Documentation

Glyph

using Glyph = sktext::gpu::Glyph

Definition at line 31 of file GrAtlasManager.cpp.

MaskFormat

using MaskFormat = skgpu::MaskFormat

Definition at line 32 of file GrAtlasManager.cpp.

Function Documentation

expand_bits()

template<typename INT_TYPE >

static void expand_bits ( INT_TYPE *  dst, const uint8_t *  src, int  width, int  height, int  dstRowBytes, int  srcRowBytes  )

static

Definition at line 58 of file GrAtlasManager.cpp.

                                         {
    for (int y = 0; y < height; ++y) {
        int rowWritesLeft = width;
        const uint8_t* s = src;
        INT_TYPE* d = dst;
        while (rowWritesLeft > 0) {
            unsigned mask = *s++;
            for (int x = 7; x >= 0 && rowWritesLeft; --x, --rowWritesLeft) {
                *d++ = (mask & (1 << x)) ? (INT_TYPE)(~0UL) : 0;
            }
        }
        dst = reinterpret_cast<INT_TYPE*>(reinterpret_cast<intptr_t>(dst) + dstRowBytes);
        src += srcRowBytes;
    }
}

get_packed_glyph_image()

static void get_packed_glyph_image ( const SkGlyph &  glyph, int  dstRB, MaskFormat  expectedMaskFormat, void *  dst  )

static

Definition at line 79 of file GrAtlasManager.cpp.

                                                                                   {
    const int width = glyph.width();
    const int height = glyph.height();
    const void* src = glyph.image();
    SkASSERT(src != nullptr);
 
    MaskFormat maskFormat = Glyph::FormatFromSkGlyph(glyph.maskFormat());
    if (maskFormat == expectedMaskFormat) {
        int srcRB = glyph.rowBytes();
        // Notice this comparison is with the glyphs raw mask format, and not its MaskFormat.
        if (glyph.maskFormat() != SkMask::kBW_Format) {
            if (srcRB != dstRB) {
                const int bbp = MaskFormatBytesPerPixel(expectedMaskFormat);
                for (int y = 0; y < height; y++) {
                    memcpy(dst, src, width * bbp);
                    src = (const char*) src + srcRB;
                    dst = (char*) dst + dstRB;
                }
            } else {
                memcpy(dst, src, dstRB * height);
            }
        } else {
            // Handle 8-bit format by expanding the mask to the expected format.
            const uint8_t* bits = reinterpret_cast<const uint8_t*>(src);
            switch (expectedMaskFormat) {
                case MaskFormat::kA8: {
                    uint8_t* bytes = reinterpret_cast<uint8_t*>(dst);
                    expand_bits(bytes, bits, width, height, dstRB, srcRB);
                    break;
                }
                case MaskFormat::kA565: {
                    uint16_t* rgb565 = reinterpret_cast<uint16_t*>(dst);
                    expand_bits(rgb565, bits, width, height, dstRB, srcRB);
                    break;
                }
                default:
                    SK_ABORT("Invalid MaskFormat");
            }
        }
    } else if (maskFormat == MaskFormat::kA565 &&
               expectedMaskFormat == MaskFormat::kARGB) {
        // Convert if the glyph uses a 565 mask format since it is using LCD text rendering
        // but the expected format is 8888 (will happen on macOS with Metal since that
        // combination does not support 565).
        static constexpr SkMasks masks{
                {0b1111'1000'0000'0000, 11, 5},  // Red
                {0b0000'0111'1110'0000,  5, 6},  // Green
                {0b0000'0000'0001'1111,  0, 5},  // Blue
                {0, 0, 0}                        // Alpha
        };
        constexpr int a565Bpp = MaskFormatBytesPerPixel(MaskFormat::kA565);
        constexpr int argbBpp = MaskFormatBytesPerPixel(MaskFormat::kARGB);
        constexpr bool kBGRAIsNative = kN32_SkColorType == kBGRA_8888_SkColorType;
        char* dstRow = (char*)dst;
        for (int y = 0; y < height; y++) {
            dst = dstRow;
            for (int x = 0; x < width; x++) {
                uint16_t color565 = 0;
                memcpy(&color565, src, a565Bpp);
                uint32_t color8888;
                // On Windows (and possibly others), font data is stored as BGR.
                // So we need to swizzle the data to reflect that.
                if (kBGRAIsNative) {
                    color8888 = GrColorPackRGBA(masks.getBlue(color565),
                                                masks.getGreen(color565),
                                                masks.getRed(color565),
                                                0xFF);
                } else {
                    color8888 = GrColorPackRGBA(masks.getRed(color565),
                                                masks.getGreen(color565),
                                                masks.getBlue(color565),
                                                0xFF);
                }
                memcpy(dst, &color8888, argbBpp);
                src = (const char*)src + a565Bpp;
                dst = (char*)dst + argbBpp;
            }
            dstRow += dstRB;
        }
    } else {
        SkUNREACHABLE;
    }
}