C++ SkBitmap::bytesPerPixel方法代码示例

static bool convertBitmapToXImage(XImage& image, const SkBitmap& bitmap) {
    sk_bzero(&image, sizeof(image));

    int bitsPerPixel = bitmap.bytesPerPixel() * 8;
    image.width = bitmap.width();
    image.height = bitmap.height();
    image.format = ZPixmap;
    image.data = (char*) bitmap.getPixels();
    image.byte_order = LSBFirst;
    image.bitmap_unit = bitsPerPixel;
    image.bitmap_bit_order = LSBFirst;
    image.bitmap_pad = bitsPerPixel;
    image.depth = 24;
    image.bytes_per_line = bitmap.rowBytes() - bitmap.width() * bitmap.bytesPerPixel();
    image.bits_per_pixel = bitsPerPixel;
    return XInitImage(&image);
}

status_t s3d_image_tnb_test(void)
{
	printf("[Unit Test] SurfaceFlinger 3D display test !\n\n");

    sp<SurfaceComposerClient> client;    
    //sp<SurfaceControl>        c;
    sp<Surface>               s;
    Surface::SurfaceInfo      i;
    SkBitmap                  tab;

    // ready the png image file
    if (false == SkImageDecoder::DecodeFile("/data/3D_TAB.png", &tab)) {
        printf("fail load file");
        return INVALID_OPERATION;
    }

    // create layer env
    client = new SurfaceComposerClient();

    printf("*** top and bottom test ...\n");
    c = client->createSurface(
            String8("test-S3D_background"),
            0,
            DRAW_FHD_W,
            DRAW_FHD_H,
            PIXEL_FORMAT_RGBA_8888,
            ISurfaceComposer::eFXSurfaceDim & ISurfaceComposer::eFXSurfaceMask);

    u = client->createSurface(String8("test-S3D_image1"), 0, tab.width(), tab.height(), PIXEL_FORMAT_RGBA_8888);
    client->openGlobalTransaction();
    {
        c->setLayer(200000);
        c->setPosition(0, 0);
        c->setAlpha(1.0f);    // black background           
        u->setLayer(240000);
        u->setPosition(0, 0);
    }
	client->closeGlobalTransaction();

    printf("    set to TAB mode\n");
    client->openGlobalTransaction();
    {
        u->setFlags(ISurfaceComposer::eLayerTopAndBottom, ISurfaceComposer::eLayerS3DMask);
    }
	client->closeGlobalTransaction();

    s = u->getSurface();
    s->lock(&i);
    {
        memcpy(i.bits, tab.getPixels(), tab.width() * tab.height() * tab.bytesPerPixel());
    }
    s->unlockAndPost();

    sleep(1);
    
    client->dispose();
    return NO_ERROR;
}

void TextureCache::uploadLoFiTexture(bool resize, const SkBitmap* bitmap,
        uint32_t width, uint32_t height) {
    SkBitmap rgbaBitmap;
    rgbaBitmap.allocPixels(SkImageInfo::MakeN32(width, height, bitmap->alphaType()));
    rgbaBitmap.eraseColor(0);

    SkCanvas canvas(rgbaBitmap);
    canvas.drawBitmap(*bitmap, 0.0f, 0.0f, nullptr);

    uploadToTexture(resize, GL_RGBA, rgbaBitmap.rowBytesAsPixels(), rgbaBitmap.bytesPerPixel(),
            width, height, GL_UNSIGNED_BYTE, rgbaBitmap.getPixels());
}

bool CCImage::initWithString(
                               const char *    pText, 
                               int             nWidth/* = 0*/, 
                               int             nHeight/* = 0*/,
                               ETextAlign      eAlignMask/* = kAlignCenter*/,
                               const char *    pFontName/* = nil*/,
                               int             nSize/* = 0*/)
{
    bool bRet = false;

    do 
    {
        CC_BREAK_IF(! pText);
		
        BitmapDC &dc = sharedBitmapDC();

		/* init font with font name and size */
		CC_BREAK_IF(! dc.setFont(pFontName, nSize));

		/* compute text width and height */
		if (nWidth <= 0 || nHeight <= 0)
		{
			dc.getTextExtentPoint(pText, &nWidth, &nHeight);
		}
		CC_BREAK_IF(nWidth <= 0 || nHeight <= 0);

		bRet = dc.drawText(pText, nWidth, nHeight, eAlignMask);

		/*init image information */
		SkBitmap *pBitmap = dc.getBitmap();
		CC_BREAK_IF(! pBitmap);

		int nWidth	= pBitmap->width();
		int nHeight	= pBitmap->height();
		CC_BREAK_IF(nWidth <= 0 || nHeight <= 0);

		int nDataLen = pBitmap->rowBytes() * pBitmap->height();
		m_pData = new unsigned char[nDataLen];
		CC_BREAK_IF(! m_pData);
		memcpy((void*) m_pData, pBitmap->getPixels(), nDataLen);

		m_nWidth    = (short)nWidth;
		m_nHeight   = (short)nHeight;
		m_bHasAlpha = true;
		m_bPreMulti = true;
		m_nBitsPerComponent = pBitmap->bytesPerPixel();

		bRet = true;
    } while (0);

    return bRet;
}

static bool equal(const SkBitmap& bm1, const SkBitmap& bm2) {
    if (bm1.width() != bm2.width() ||
        bm1.height() != bm2.height() ||
        bm1.config() != bm2.config()) {
        return false;
    }

    size_t pixelBytes = bm1.width() * bm1.bytesPerPixel();
    for (int y = 0; y < bm1.height(); y++) {
        if (memcmp(bm1.getAddr(0, y), bm2.getAddr(0, y), pixelBytes)) {
            return false;
        }
    }
    return true;
}

static void jni_eglCreatePixmapSurface(JNIEnv *_env, jobject _this, jobject out_sur,
        jobject display, jobject config, jobject native_pixmap,
        jintArray attrib_list)
{
    if (display == NULL || config == NULL || native_pixmap == NULL
        || !validAttribList(_env, attrib_list)) {
        jniThrowException(_env, "java/lang/IllegalArgumentException", NULL);
        return;
    }
    EGLDisplay dpy = getDisplay(_env, display);
    EGLConfig  cnf = getConfig(_env, config);
    jint* base = 0;

    SkBitmap nativeBitmap;
    GraphicsJNI::getSkBitmap(_env, native_pixmap, &nativeBitmap);
    SkPixelRef* ref = nativeBitmap.pixelRef();
    if (ref == NULL) {
        jniThrowException(_env, "java/lang/IllegalArgumentException", "Bitmap has no PixelRef");
        return;
    }

    SkSafeRef(ref);
    ref->lockPixels();

    egl_native_pixmap_t pixmap;
    pixmap.version = sizeof(pixmap);
    pixmap.width  = nativeBitmap.width();
    pixmap.height = nativeBitmap.height();
    pixmap.stride = nativeBitmap.rowBytes() / nativeBitmap.bytesPerPixel();
    pixmap.format = convertPixelFormat(nativeBitmap.colorType());
    pixmap.data   = (uint8_t*)ref->pixels();

    base = beginNativeAttribList(_env, attrib_list);
    EGLSurface sur = eglCreatePixmapSurface(dpy, cnf, &pixmap, base);
    endNativeAttributeList(_env, attrib_list, base);

    if (sur != EGL_NO_SURFACE) {
        _env->SetLongField(out_sur, gSurface_EGLSurfaceFieldID, reinterpret_cast<jlong>(sur));
        _env->SetLongField(out_sur, gSurface_NativePixelRefFieldID, reinterpret_cast<jlong>(ref));
    } else {
        ref->unlockPixels();
        SkSafeUnref(ref);
    }
}

CGImageRef SkCreateCGImageRefWithColorspace(const SkBitmap& bm,
                                            CGColorSpaceRef colorSpace) {
    size_t bitsPerComponent SK_INIT_TO_AVOID_WARNING;
    CGBitmapInfo info       SK_INIT_TO_AVOID_WARNING;

    SkBitmap* bitmap = prepareForImageRef(bm, &bitsPerComponent, &info);
    if (NULL == bitmap) {
        return NULL;
    }

    const int w = bitmap->width();
    const int h = bitmap->height();
    const size_t s = bitmap->getSize();

    // our provider "owns" the bitmap*, and will take care of deleting it
    // we initially lock it, so we can access the pixels. The bitmap will be deleted in the release
    // proc, which will in turn unlock the pixels
    bitmap->lockPixels();
    CGDataProviderRef dataRef = CGDataProviderCreateWithData(bitmap, bitmap->getPixels(), s,
                                                             SkBitmap_ReleaseInfo);

    bool releaseColorSpace = false;
    if (NULL == colorSpace) {
        colorSpace = CGColorSpaceCreateDeviceRGB();
        releaseColorSpace = true;
    }

    CGImageRef ref = CGImageCreate(w, h, bitsPerComponent,
                                   bitmap->bytesPerPixel() * 8,
                                   bitmap->rowBytes(), colorSpace, info, dataRef,
                                   NULL, false, kCGRenderingIntentDefault);

    if (releaseColorSpace) {
        CGColorSpaceRelease(colorSpace);
    }
    CGDataProviderRelease(dataRef);
    return ref;
}

// Utility function to set value of any pixel in bm.
// bm.getConfig() specifies what format 'val' must be
// converted to, but at present uint32_t can handle all formats.
static void setPixel(int x, int y, uint32_t val, SkBitmap& bm) {
    uint16_t val16;
    uint8_t val8;
    SkAutoLockPixels lock(bm);
    void* rawAddr = bm.getAddr(x,y);

    switch (bm.bytesPerPixel()) {
        case 4:
            memcpy(rawAddr, &val, sizeof(uint32_t));
            break;
        case 2:
            val16 = val & 0xFFFF;
            memcpy(rawAddr, &val16, sizeof(uint16_t));
            break;
        case 1:
            val8 = val & 0xFF;
            memcpy(rawAddr, &val8, sizeof(uint8_t));
            break;
        default:
            // Ignore.
            break;
    }
}

// Utility function to read the value of a given pixel in bm. All
// values converted to uint32_t for simplification of comparisons.
static uint32_t getPixel(int x, int y, const SkBitmap& bm) {
    uint32_t val = 0;
    uint16_t val16;
    uint8_t val8;
    SkAutoLockPixels lock(bm);
    const void* rawAddr = bm.getAddr(x,y);

    switch (bm.bytesPerPixel()) {
        case 4:
            memcpy(&val, rawAddr, sizeof(uint32_t));
            break;
        case 2:
            memcpy(&val16, rawAddr, sizeof(uint16_t));
            val = val16;
            break;
        case 1:
            memcpy(&val8, rawAddr, sizeof(uint8_t));
            val = val8;
            break;
        default:
            break;
    }
    return val;
}

static jboolean com_android_server_AssetAtlasService_upload(JNIEnv* env, jobject,
        jobject graphicBuffer, jlong bitmapHandle) {

    SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(bitmapHandle);
    // The goal of this method is to copy the bitmap into the GraphicBuffer
    // using the GPU to swizzle the texture content
    sp<GraphicBuffer> buffer(graphicBufferForJavaObject(env, graphicBuffer));

    if (buffer != NULL) {
        EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
        if (display == EGL_NO_DISPLAY) return JNI_FALSE;

        EGLint major;
        EGLint minor;
        if (!eglInitialize(display, &major, &minor)) {
            ALOGW("Could not initialize EGL");
            return JNI_FALSE;
        }

        // We're going to use a 1x1 pbuffer surface later on
        // The configuration doesn't really matter for what we're trying to do
        EGLint configAttrs[] = {
                EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
                EGL_RED_SIZE, 8,
                EGL_GREEN_SIZE, 8,
                EGL_BLUE_SIZE, 8,
                EGL_ALPHA_SIZE, 0,
                EGL_DEPTH_SIZE, 0,
                EGL_STENCIL_SIZE, 0,
                EGL_NONE
        };
        EGLConfig configs[1];
        EGLint configCount;
        if (!eglChooseConfig(display, configAttrs, configs, 1, &configCount)) {
            ALOGW("Could not select EGL configuration");
            eglReleaseThread();
            eglTerminate(display);
            return JNI_FALSE;
        }
        if (configCount <= 0) {
            ALOGW("Could not find EGL configuration");
            eglReleaseThread();
            eglTerminate(display);
            return JNI_FALSE;
        }

        // These objects are initialized below but the default "null"
        // values are used to cleanup properly at any point in the
        // initialization sequence
        GLuint texture = 0;
        EGLImageKHR image = EGL_NO_IMAGE_KHR;
        EGLSurface surface = EGL_NO_SURFACE;
        EGLSyncKHR fence = EGL_NO_SYNC_KHR;

        EGLint attrs[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
        EGLContext context = eglCreateContext(display, configs[0], EGL_NO_CONTEXT, attrs);
        if (context == EGL_NO_CONTEXT) {
            ALOGW("Could not create EGL context");
            CLEANUP_GL_AND_RETURN(JNI_FALSE);
        }

        // Create the 1x1 pbuffer
        EGLint surfaceAttrs[] = { EGL_WIDTH, 1, EGL_HEIGHT, 1, EGL_NONE };
        surface = eglCreatePbufferSurface(display, configs[0], surfaceAttrs);
        if (surface == EGL_NO_SURFACE) {
            ALOGW("Could not create EGL surface");
            CLEANUP_GL_AND_RETURN(JNI_FALSE);
        }

        if (!eglMakeCurrent(display, surface, surface, context)) {
            ALOGW("Could not change current EGL context");
            CLEANUP_GL_AND_RETURN(JNI_FALSE);
        }

        // We use an EGLImage to access the content of the GraphicBuffer
        // The EGL image is later bound to a 2D texture
        EGLClientBuffer clientBuffer = (EGLClientBuffer) buffer->getNativeBuffer();
        EGLint imageAttrs[] = { EGL_IMAGE_PRESERVED_KHR, EGL_TRUE, EGL_NONE };
        image = eglCreateImageKHR(display, EGL_NO_CONTEXT,
                EGL_NATIVE_BUFFER_ANDROID, clientBuffer, imageAttrs);
        if (image == EGL_NO_IMAGE_KHR) {
            ALOGW("Could not create EGL image");
            CLEANUP_GL_AND_RETURN(JNI_FALSE);
        }

        glGenTextures(1, &texture);
        glBindTexture(GL_TEXTURE_2D, texture);
        glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, image);
        if (glGetError() != GL_NO_ERROR) {
            ALOGW("Could not create/bind texture");
            CLEANUP_GL_AND_RETURN(JNI_FALSE);
        }

        // Upload the content of the bitmap in the GraphicBuffer
        glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel());
        glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, bitmap->width(), bitmap->height(),
                GL_RGBA, GL_UNSIGNED_BYTE, bitmap->getPixels());
        if (glGetError() != GL_NO_ERROR) {
            ALOGW("Could not upload to texture");
            CLEANUP_GL_AND_RETURN(JNI_FALSE);
//.........这里部分代码省略.........

bool SkKTXFile::WriteBitmapToKTX(SkWStream* stream, const SkBitmap& bitmap) {
    const SkColorType ct = bitmap.colorType();
    SkAutoLockPixels alp(bitmap);

    const int width = bitmap.width();
    const int height = bitmap.width();
    const uint8_t* src = reinterpret_cast<uint8_t*>(bitmap.getPixels());
    if (NULL == bitmap.getPixels()) {
        return false;
    }

    // First thing's first, write out the magic identifier and endianness...
    if (!stream->write(KTX_FILE_IDENTIFIER, KTX_FILE_IDENTIFIER_SIZE) ||
        !stream->write(&kKTX_ENDIANNESS_CODE, 4)) {
        return false;
    }

    // Collect our key/value pairs...
    SkTArray<KeyValue> kvPairs;

    // Next, write the header based on the bitmap's config.
    Header hdr;
    switch (ct) {
        case kIndex_8_SkColorType:
            // There is a compressed format for this, but we don't support it yet.
            SkDebugf("Writing indexed bitmap to KTX unsupported.\n");
            // VVV fall through VVV
        default:
        case kUnknown_SkColorType:
            // Bitmap hasn't been configured.
            return false;

        case kAlpha_8_SkColorType:
            hdr.fGLType = GR_GL_UNSIGNED_BYTE;
            hdr.fGLTypeSize = 1;
            hdr.fGLFormat = GR_GL_RED;
            hdr.fGLInternalFormat = GR_GL_R8;
            hdr.fGLBaseInternalFormat = GR_GL_RED;
            break;

        case kRGB_565_SkColorType:
            hdr.fGLType = GR_GL_UNSIGNED_SHORT_5_6_5;
            hdr.fGLTypeSize = 2;
            hdr.fGLFormat = GR_GL_RGB;
            hdr.fGLInternalFormat = GR_GL_RGB;
            hdr.fGLBaseInternalFormat = GR_GL_RGB;
            break;

        case kARGB_4444_SkColorType:
            hdr.fGLType = GR_GL_UNSIGNED_SHORT_4_4_4_4;
            hdr.fGLTypeSize = 2;
            hdr.fGLFormat = GR_GL_RGBA;
            hdr.fGLInternalFormat = GR_GL_RGBA4;
            hdr.fGLBaseInternalFormat = GR_GL_RGBA;
            kvPairs.push_back(CreateKeyValue("KTXPremultipliedAlpha", "True"));
            break;

        case kN32_SkColorType:
            hdr.fGLType = GR_GL_UNSIGNED_BYTE;
            hdr.fGLTypeSize = 1;
            hdr.fGLFormat = GR_GL_RGBA;
            hdr.fGLInternalFormat = GR_GL_RGBA8;
            hdr.fGLBaseInternalFormat = GR_GL_RGBA;
            kvPairs.push_back(CreateKeyValue("KTXPremultipliedAlpha", "True"));
            break;
    }

    // Everything else in the header is shared.
    hdr.fPixelWidth = width;
    hdr.fPixelHeight = height;
    hdr.fNumberOfArrayElements = 0;
    hdr.fNumberOfFaces = 1;
    hdr.fNumberOfMipmapLevels = 1;

    // Calculate the key value data size
    hdr.fBytesOfKeyValueData = 0;
    for (KeyValue *kv = kvPairs.begin(); kv != kvPairs.end(); ++kv) {
        // Key value size is the size of the key value data,
        // four bytes for saying how big the key value size is
        // and then additional bytes for padding to four byte boundary
        size_t kvsize = kv->size();
        kvsize += 4;
        kvsize = (kvsize + 3) & ~3;
        hdr.fBytesOfKeyValueData = SkToU32(hdr.fBytesOfKeyValueData + kvsize);
    }

    // Write the header
    if (!stream->write(&hdr, sizeof(hdr))) {
        return false;
    }

    // Write out each key value pair
    for (KeyValue *kv = kvPairs.begin(); kv != kvPairs.end(); ++kv) {
        if (!kv->writeKeyAndValueForKTX(stream)) {
            return false;
        }
    }

    // Calculate the size of the data
    int bpp = bitmap.bytesPerPixel();
//.........这里部分代码省略.........

SkPDFImage::SkPDFImage(const SkBitmap& bitmap, const SkPaint& paint) {
    SkBitmap::Config config = bitmap.getConfig();

    // TODO(vandebo) Handle alpha and alpha only images correctly.
    SkASSERT(config == SkBitmap::kRGB_565_Config ||
             config == SkBitmap::kARGB_4444_Config ||
             config == SkBitmap::kARGB_8888_Config ||
             config == SkBitmap::kIndex8_Config ||
             config == SkBitmap::kRLE_Index8_Config);

    SkMemoryStream* image_data = extractImageData(bitmap);
    SkAutoUnref image_data_unref(image_data);
    fStream = new SkPDFStream(image_data);
    fStream->unref();  // SkRefPtr and new both took a reference.

    SkRefPtr<SkPDFName> typeValue = new SkPDFName("XObject");
    typeValue->unref();  // SkRefPtr and new both took a reference.
    insert("Type", typeValue.get());

    SkRefPtr<SkPDFName> subTypeValue = new SkPDFName("Image");
    subTypeValue->unref();  // SkRefPtr and new both took a reference.
    insert("Subtype", subTypeValue.get());

    SkRefPtr<SkPDFInt> widthValue = new SkPDFInt(bitmap.width());
    widthValue->unref();  // SkRefPtr and new both took a reference.
    insert("Width", widthValue.get());

    SkRefPtr<SkPDFInt> heightValue = new SkPDFInt(bitmap.height());
    heightValue->unref();  // SkRefPtr and new both took a reference.
    insert("Height", heightValue.get());

    // if (!image mask) {
    SkRefPtr<SkPDFObject> colorSpaceValue;
    if (config == SkBitmap::kIndex8_Config ||
        config == SkBitmap::kRLE_Index8_Config) {
        colorSpaceValue = makeIndexedColorSpace(bitmap.getColorTable());
    } else {
        colorSpaceValue = new SkPDFName("DeviceRGB");
    }
    colorSpaceValue->unref();  // SkRefPtr and new both took a reference.
    insert("ColorSpace", colorSpaceValue.get());
    // }

    int bitsPerComp = bitmap.bytesPerPixel() * 2;
    if (bitsPerComp == 0) {
        SkASSERT(config == SkBitmap::kA1_Config);
        bitsPerComp = 1;
    } else if (bitsPerComp == 2 ||
               (bitsPerComp == 4 && config == SkBitmap::kRGB_565_Config)) {
        bitsPerComp = 8;
    }
    SkRefPtr<SkPDFInt> bitsPerCompValue = new SkPDFInt(bitsPerComp);
    bitsPerCompValue->unref();  // SkRefPtr and new both took a reference.
    insert("BitsPerComponent", bitsPerCompValue.get());

    if (config == SkBitmap::kRGB_565_Config) {
        SkRefPtr<SkPDFInt> zeroVal = new SkPDFInt(0);
        zeroVal->unref();  // SkRefPtr and new both took a reference.
        SkRefPtr<SkPDFScalar> scale5Val = new SkPDFScalar(8.2258);  // 255/2^5-1
        scale5Val->unref();  // SkRefPtr and new both took a reference.
        SkRefPtr<SkPDFScalar> scale6Val = new SkPDFScalar(4.0476);  // 255/2^6-1
        scale6Val->unref();  // SkRefPtr and new both took a reference.
        SkRefPtr<SkPDFArray> decodeValue = new SkPDFArray();
        decodeValue->unref();  // SkRefPtr and new both took a reference.
        decodeValue->reserve(6);
        decodeValue->append(zeroVal.get());
        decodeValue->append(scale5Val.get());
        decodeValue->append(zeroVal.get());
        decodeValue->append(scale6Val.get());
        decodeValue->append(zeroVal.get());
        decodeValue->append(scale5Val.get());
        insert("Decode", decodeValue.get());
    }
}