C++ SkColorTable::lockColors方法代码示例

/*  Fill out buffer with the compressed format Ganesh expects from a colortable
 based bitmap. [palette (colortable) + indices].

 At the moment Ganesh only supports 8bit version. If Ganesh allowed we others
 we could detect that the colortable.count is <= 16, and then repack the
 indices as nibbles to save RAM, but it would take more time (i.e. a lot
 slower than memcpy), so skipping that for now.

 Ganesh wants a full 256 palette entry, even though Skia's ctable is only as big
 as the colortable.count says it is.
 */
static void build_compressed_data(void* buffer, const SkBitmap& bitmap) {
    SkASSERT(SkBitmap::kIndex8_Config == bitmap.config());

    SkAutoLockPixels apl(bitmap);
    if (!bitmap.readyToDraw()) {
        SkASSERT(!"bitmap not ready to draw!");
        return;
    }

    SkColorTable* ctable = bitmap.getColorTable();
    char* dst = (char*)buffer;

    memcpy(dst, ctable->lockColors(), ctable->count() * sizeof(SkPMColor));
    ctable->unlockColors(false);

    // always skip a full 256 number of entries, even if we memcpy'd fewer
    dst += kGrColorTableSize;

    if (bitmap.width() == bitmap.rowBytes()) {
        memcpy(dst, bitmap.getPixels(), bitmap.getSize());
    } else {
        // need to trim off the extra bytes per row
        size_t width = bitmap.width();
        size_t rowBytes = bitmap.rowBytes();
        const char* src = (const char*)bitmap.getPixels();
        for (int y = 0; y < bitmap.height(); y++) {
            memcpy(dst, src, width);
            src += rowBytes;
            dst += width;
        }
    }
}

static void convertToIndex666(const SkBitmap& src, SkBitmap* dst) {
    SkColorTable* ctable = new SkColorTable(216);
    SkPMColor* colors = ctable->lockColors();
    // rrr ggg bbb
    for (int r = 0; r < 6; r++) {
        int rr = conv6ToByte(r);
        for (int g = 0; g < 6; g++) {
            int gg = conv6ToByte(g);
            for (int b = 0; b < 6; b++) {
                int bb = conv6ToByte(b);
                *colors++ = SkPreMultiplyARGB(0xFF, rr, gg, bb);
            }
        }
    }
    ctable->unlockColors(true);
    dst->setConfig(SkBitmap::kIndex8_Config, src.width(), src.height());
    dst->allocPixels(ctable);
    ctable->unref();

    SkAutoLockPixels alps(src);
    SkAutoLockPixels alpd(*dst);

    for (int y = 0; y < src.height(); y++) {
        const SkPMColor* srcP = src.getAddr32(0, y);
        uint8_t* dstP = dst->getAddr8(0, y);
        for (int x = src.width() - 1; x >= 0; --x) {
            *dstP++ = compute666Index(*srcP++);
        }
    }
}

static SkBitmap make_bitmap() {
    SkBitmap bm;
    SkColorTable* ctable = new SkColorTable(256);

    SkPMColor* c = ctable->lockColors();
    for (int i = 0; i < 256; i++) {
        c[i] = SkPackARGB32(255 - i, 0, 0, 0);
    }
    ctable->unlockColors(true);
    bm.setConfig(SkBitmap::kIndex8_Config, 256, 256);
    bm.allocPixels(ctable);
    ctable->unref();

    bm.lockPixels();
    const float cx = bm.width() * 0.5f;
    const float cy = bm.height() * 0.5f;
    for (int y = 0; y < bm.height(); y++) {
        float dy = y - cy;
        dy *= dy;
        uint8_t* p = bm.getAddr8(0, y);
        for (int x = 0; x < 256; x++) {
            float dx = x - cx;
            dx *= dx;
            float d = (dx + dy) / (cx/2);
            int id = (int)d;
            if (id > 255) {
                id = 255;
            }
            p[x] = id;
        }
    }
    bm.unlockPixels();
    return bm;
}

static SkBitmap make_bitmap()
    {
    SkBitmap bm;
    SkColorTable* ctable = new SkColorTable(256);

    SkPMColor* c = ctable->lockColors();
    for (int i = 0; i < 256; i++)
        {
        c[i] = SkPackARGB32(0xFF, i, 0, 0);
        }
    ctable->unlockColors(true);
    bm.setConfig(SkBitmap::kIndex8_Config, 256, 32);
    bm.allocPixels(ctable);
    ctable->unref();

    bm.lockPixels();
    for (int y = 0; y < bm.height(); y++)
        {
        uint8_t* p = bm.getAddr8(0, y);
        for (int x = 0; x < 256; x++)
            {
            p[x] = x;
            }
        }
    bm.unlockPixels();
    return bm;
    }

static jboolean Bitmap_writeToParcel(JNIEnv* env, jobject,
                                     jlong bitmapHandle,
                                     jboolean isMutable, jint density,
                                     jobject parcel) {
    const SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(bitmapHandle);
    if (parcel == NULL) {
        SkDebugf("------- writeToParcel null parcel\n");
        return JNI_FALSE;
    }

    android::Parcel* p = android::parcelForJavaObject(env, parcel);

    p->writeInt32(isMutable);
    p->writeInt32(bitmap->colorType());
    p->writeInt32(bitmap->alphaType());
    p->writeInt32(bitmap->width());
    p->writeInt32(bitmap->height());
    p->writeInt32(bitmap->rowBytes());
    p->writeInt32(density);

    if (bitmap->colorType() == kIndex_8_SkColorType) {
        SkColorTable* ctable = bitmap->getColorTable();
        if (ctable != NULL) {
            int count = ctable->count();
            p->writeInt32(count);
            memcpy(p->writeInplace(count * sizeof(SkPMColor)),
                   ctable->lockColors(), count * sizeof(SkPMColor));
            ctable->unlockColors();
        } else {
            p->writeInt32(0);   // indicate no ctable
        }
    }

    size_t size = bitmap->getSize();

    android::Parcel::WritableBlob blob;
    android::status_t status = p->writeBlob(size, &blob);
    if (status) {
        doThrowRE(env, "Could not write bitmap to parcel blob.");
        return JNI_FALSE;
    }

    bitmap->lockPixels();
    const void* pSrc =  bitmap->getPixels();
    if (pSrc == NULL) {
        memset(blob.data(), 0, size);
    } else {
        memcpy(blob.data(), pSrc, size);
    }
    bitmap->unlockPixels();

    blob.release();
    return JNI_TRUE;
}

/*  Fill out buffer with the compressed format GL expects from a colortable
    based bitmap. [palette (colortable) + indices].

    At the moment I always take the 8bit version, since that's what my data
    is. I could detect that the colortable.count is <= 16, and then repack the
    indices as nibbles to save RAM, but it would take more time (i.e. a lot
    slower than memcpy), so I'm skipping that for now.

    GL wants a full 256 palette entry, even though my ctable is only as big
    as the colortable.count says it is. I presume it is OK to leave any
    trailing entries uninitialized, since none of my indices should exceed
    ctable->count().
*/
static void build_compressed_data(void* buffer, const SkBitmap& bitmap) {
    SkASSERT(SkBitmap::kIndex8_Config == bitmap.config());

    SkColorTable* ctable = bitmap.getColorTable();
    uint8_t* dst = (uint8_t*)buffer;

    memcpy(dst, ctable->lockColors(), ctable->count() * sizeof(SkPMColor));
    ctable->unlockColors(false);

    // always skip a full 256 number of entries, even if we memcpy'd fewer
    dst += SK_GL_SIZE_OF_PALETTE;
    memcpy(dst, bitmap.getPixels(), bitmap.getSize());
}

/*  Fill out buffer with the compressed format Ganesh expects from a colortable
 based bitmap. [palette (colortable) + indices].

 At the moment Ganesh only supports 8bit version. If Ganesh allowed we others
 we could detect that the colortable.count is <= 16, and then repack the
 indices as nibbles to save RAM, but it would take more time (i.e. a lot
 slower than memcpy), so skipping that for now.

 Ganesh wants a full 256 palette entry, even though Skia's ctable is only as big
 as the colortable.count says it is.
 */
static void build_compressed_data(void* buffer, const SkBitmap& bitmap) {
    SkASSERT(SkBitmap::kIndex8_Config == bitmap.config());

    SkAutoLockPixels alp(bitmap);
    if (!bitmap.readyToDraw()) {
        SkDEBUGFAIL("bitmap not ready to draw!");
        return;
    }

    SkColorTable* ctable = bitmap.getColorTable();
    char* dst = (char*)buffer;

    const int count = ctable->count();

    SkDstPixelInfo dstPI;
    dstPI.fColorType = kRGBA_8888_SkColorType;
    dstPI.fAlphaType = kPremul_SkAlphaType;
    dstPI.fPixels = buffer;
    dstPI.fRowBytes = count * sizeof(SkPMColor);

    SkSrcPixelInfo srcPI;
    srcPI.fColorType = kPMColor_SkColorType;
    srcPI.fAlphaType = kPremul_SkAlphaType;
    srcPI.fPixels = ctable->lockColors();
    srcPI.fRowBytes = count * sizeof(SkPMColor);

    srcPI.convertPixelsTo(&dstPI, count, 1);

    ctable->unlockColors();

    // always skip a full 256 number of entries, even if we memcpy'd fewer
    dst += kGrColorTableSize;

    if ((unsigned)bitmap.width() == bitmap.rowBytes()) {
        memcpy(dst, bitmap.getPixels(), bitmap.getSize());
    } else {
        // need to trim off the extra bytes per row
        size_t width = bitmap.width();
        size_t rowBytes = bitmap.rowBytes();
        const char* src = (const char*)bitmap.getPixels();
        for (int y = 0; y < bitmap.height(); y++) {
            memcpy(dst, src, width);
            src += rowBytes;
            dst += width;
        }
    }
}

static SkBitmap make_bitmap() {
    SkBitmap bm;

    SkColorTable* ctable = new SkColorTable(1);
    SkPMColor* c = ctable->lockColors();
    c[0] = SkPackARGB32(0x80, 0x80, 0, 0);
    ctable->unlockColors(true);

    bm.setConfig(SkBitmap::kIndex8_Config, 1, 1);
    bm.allocPixels(ctable);
    ctable->unref();

    bm.lockPixels();
    *bm.getAddr8(0, 0) = 0;
    bm.unlockPixels();
    return bm;
}

static SkBitmap make_bitmap() {
    SkBitmap bm;
    const int N = 1;
    SkColorTable* ctable = new SkColorTable(N);

    SkPMColor* c = ctable->lockColors();
    for (int i = 0; i < N; i++) {
        c[i] = SkPackARGB32(0x80, 0x80, 0, 0);
    }
    ctable->unlockColors(true);
    bm.setConfig(SkBitmap::kIndex8_Config, 1, 1);
    bm.allocPixels(ctable);
    ctable->unref();

    bm.lockPixels();
    for (int y = 0; y < bm.height(); y++) {
        uint8_t* p = bm.getAddr8(0, y);
        for (int x = 0; x < bm.width(); x++) {
            p[x] = 0;
        }
    }
    bm.unlockPixels();
    return bm;
}

/*  Fill out buffer with the compressed format Ganesh expects from a colortable
 based bitmap. [palette (colortable) + indices].

 At the moment Ganesh only supports 8bit version. If Ganesh allowed we others
 we could detect that the colortable.count is <= 16, and then repack the
 indices as nibbles to save RAM, but it would take more time (i.e. a lot
 slower than memcpy), so skipping that for now.

 Ganesh wants a full 256 palette entry, even though Skia's ctable is only as big
 as the colortable.count says it is.
 */
static void build_compressed_data(void* buffer, const SkBitmap& bitmap) {
    SkASSERT(SkBitmap::kIndex8_Config == bitmap.config());

    SkAutoLockPixels alp(bitmap);
    if (!bitmap.readyToDraw()) {
        SkDEBUGFAIL("bitmap not ready to draw!");
        return;
    }

    SkColorTable* ctable = bitmap.getColorTable();
    char* dst = (char*)buffer;

    uint32_t* colorTableDst = reinterpret_cast<uint32_t*>(dst);
    const uint32_t* colorTableSrc = reinterpret_cast<const uint32_t*>(ctable->lockColors());
    SkConvertConfig8888Pixels(colorTableDst, 0, SkCanvas::kRGBA_Premul_Config8888,
                              colorTableSrc, 0, SkCanvas::kNative_Premul_Config8888,
                              ctable->count(), 1);
    ctable->unlockColors();

    // always skip a full 256 number of entries, even if we memcpy'd fewer
    dst += kGrColorTableSize;

    if ((unsigned)bitmap.width() == bitmap.rowBytes()) {
        memcpy(dst, bitmap.getPixels(), bitmap.getSize());
    } else {
        // need to trim off the extra bytes per row
        size_t width = bitmap.width();
        size_t rowBytes = bitmap.rowBytes();
        const char* src = (const char*)bitmap.getPixels();
        for (int y = 0; y < bitmap.height(); y++) {
            memcpy(dst, src, width);
            src += rowBytes;
            dst += width;
        }
    }
}

//.........这里部分代码省略.........
    }

    /* Make a grayscale image into RGB. */
    if (color_type == PNG_COLOR_TYPE_GRAY ||
            color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
        png_set_gray_to_rgb(png_ptr);
    }

    // we track if we actually see a non-opaque pixels, since sometimes a PNG sets its colortype
    // to |= PNG_COLOR_MASK_ALPHA, but all of its pixels are in fact opaque. We care, since we
    // draw lots faster if we can flag the bitmap has being opaque
    bool reallyHasAlpha = false;

    SkColorTable* colorTable = NULL;

    if (color_type == PNG_COLOR_TYPE_PALETTE) {
        int num_palette;
        png_colorp palette;
        png_bytep trans;
        int num_trans;

        png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette);
        
        /*  BUGGY IMAGE WORKAROUND
            
            We hit some images (e.g. fruit_.png) who contain bytes that are == colortable_count
            which is a problem since we use the byte as an index. To work around this we grow
            the colortable by 1 (if its < 256) and duplicate the last color into that slot.
        */
        int colorCount = num_palette + (num_palette < 256);

        colorTable = SkNEW_ARGS(SkColorTable, (colorCount));

        SkPMColor* colorPtr = colorTable->lockColors();
        if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
            png_get_tRNS(png_ptr, info_ptr, &trans, &num_trans, NULL);
            hasAlpha = (num_trans > 0);
        } else {
            num_trans = 0;
            colorTable->setFlags(colorTable->getFlags() | SkColorTable::kColorsAreOpaque_Flag);
        }        
        // check for bad images that might make us crash
        if (num_trans > num_palette) {
            num_trans = num_palette;
        }

        int index = 0;
        int transLessThanFF = 0;

        for (; index < num_trans; index++) {
            transLessThanFF |= (int)*trans - 0xFF;
            *colorPtr++ = SkPreMultiplyARGB(*trans++, palette->red, palette->green, palette->blue);
            palette++;
        }
        reallyHasAlpha |= (transLessThanFF < 0);

        for (; index < num_palette; index++) {
            *colorPtr++ = SkPackARGB32(0xFF, palette->red, palette->green, palette->blue);
            palette++;
        }

        // see BUGGY IMAGE WORKAROUND comment above
        if (num_palette < 256) {
            *colorPtr = colorPtr[-1];
        }
        colorTable->unlockColors(true);