6.22 android计算字符高度宽度，红蓝3D图片的制作原理及NDK生成实现

http://my.oschina.net/jingshishengxu/blog/36412

长度：

方法1：Paint.getTextWidths(text, widths)

方法2：Rect rect = new Rect();

pFont.getTextBounds(text, 0, text.length(), rect);

width=rect.width();

高度：

m_txtPaint.getFontMetrics().descent - m_txtPaint.getFontMetrics().ascent

http://www.cnblogs.com/error404/archive/2013/01/25/2876888.html

Paint pFont = new Paint();Rect rect = new Rect();pFont.getTextBounds("豆", 0, 1, rect);Log.v(TAG, "height:"+rect.height()+"width:"+rect.width());

红蓝3d图片制作原理：

http://blog.csdn.net/iamsheldon/article/details/8011688

人眼分左右，红蓝3D图片实际是两种不同角度拍摄的两种图片合成的。

ps制作红蓝3d图片

http://jingyan.baidu.com/article/cbcede072c268c02f40b4d26.html

如何制作？：

http://www.scec.org/geowall/makeanaglyph.html

左边图片只提取红色，右边图片提取绿、蓝色，左图片左移一段距离，重叠上右图，最终合成红蓝3D图片。

上文描述了原理，下面是NDK合成红蓝3D图片的代码：

/**红蓝图片合成左边图片，自动取红色右边图片，自动取绿蓝色目标生成图片，必须和右边图片尺寸一样两图片间的左右距离by touch_ping**/JNIEXPORT void JNICALL Java_com_george_jni_PUtilJni_createRedBlue3DPic  (JNIEnv *env, jclass clazz, jobject leftBitmap_Red,jobject rightBitmap_GreenBlue,jobject tagBitmap,jint distent) {    JNIEnv J = *env;if (leftBitmap_Red == NULL) {    J->ThrowNew(env, J->FindClass(env, "java/io/IOException"), "leftBitmap_Red is null");return;}if (rightBitmap_GreenBlue == NULL) {    J->ThrowNew(env, J->FindClass(env, "java/io/IOException"), "rightBitmap_GreenBlue is null");    return;    }    if (tagBitmap == NULL) {    J->ThrowNew(env, J->FindClass(env, "java/io/IOException"), "tagBitmap is null");        return;        }// Get bitmap infoAndroidBitmapInfo lInfo;memset(&lInfo, 0, sizeof(lInfo));AndroidBitmap_getInfo(env, leftBitmap_Red, &lInfo);// Check format, only RGB565 & RGBA are supportedif (lInfo.width <= 0 || lInfo.height <= 0 ||(lInfo.format != ANDROID_BITMAP_FORMAT_RGB_565 && lInfo.format != ANDROID_BITMAP_FORMAT_RGBA_8888)) {LOGI("invalid bitmap:leftBitmap_Red\n");J->ThrowNew(env, J->FindClass(env, "java/io/IOException"), "invalid bitmap");return;   }    //format 4==565    //format 1==8888// Lock the bitmap to get the buffer    void * lPixels = NULL;    int res = AndroidBitmap_lockPixels(env, leftBitmap_Red, &lPixels);    if (lPixels == NULL) {    LOGI("fail to lock bitmap: %d\n", res);    J->ThrowNew(env, J->FindClass(env, "java/io/IOException"), "fail to open bitmap");    return;    }    LOGI("lBitmap Effect: %dx%d, %d\n", lInfo.width, lInfo.height, lInfo.format);// Get bitmap info    AndroidBitmapInfo rInfo;    memset(&rInfo, 0, sizeof(rInfo));    AndroidBitmap_getInfo(env, rightBitmap_GreenBlue, &rInfo);    // Check format, only RGB565 & RGBA are supported    if (rInfo.width <= 0 || rInfo.height <= 0 ||    (rInfo.format != ANDROID_BITMAP_FORMAT_RGB_565 && rInfo.format != ANDROID_BITMAP_FORMAT_RGBA_8888)) {    LOGI("invalid bitmap:rightBitmap_GreenBlue\n");    J->ThrowNew(env, J->FindClass(env, "java/io/IOException"), "invalid bitmap");    return;    }    // Lock the bitmap to get the buffer            void * rPixels = NULL;             res = AndroidBitmap_lockPixels(env, rightBitmap_GreenBlue, &rPixels);            if (rPixels == NULL) {            LOGI("fail to lock bitmap: %d\n", res);            J->ThrowNew(env, J->FindClass(env, "java/io/IOException"), "fail to open bitmap");            return;            }            LOGI("rBitmap Effect: %dx%d, %d\n", rInfo.width, rInfo.height, rInfo.format);    // Get bitmap info            AndroidBitmapInfo tInfo;            memset(&tInfo, 0, sizeof(tInfo));            AndroidBitmap_getInfo(env, tagBitmap, &tInfo);            // Check format, only RGB565 & RGBA are supported            if (tInfo.width <= 0 || tInfo.height <= 0 ||            (tInfo.format != ANDROID_BITMAP_FORMAT_RGB_565 && tInfo.format != ANDROID_BITMAP_FORMAT_RGBA_8888)) {            LOGI("invalid bitmap:tagBitmap\n");            J->ThrowNew(env, J->FindClass(env, "java/io/IOException"), "invalid bitmap");            return;            }    // Lock the bitmap to get the buffer            void * tPixels = NULL;             res = AndroidBitmap_lockPixels(env, tagBitmap, &tPixels);            if (tPixels == NULL) {            LOGI("fail to lock bitmap: %d\n", res);            J->ThrowNew(env, J->FindClass(env, "java/io/IOException"), "fail to open bitmap");            return;            }            LOGI("tagBitmap Effect: %dx%d, %d\n", tInfo.width, tInfo.height, tInfo.format);        if (tInfo.format != rInfo.format || tInfo.format != lInfo.format) {                    J->ThrowNew(env, J->FindClass(env, "java/io/IOException"), "the format is not same");                    return;        }int x = 0, y = 0;// From top to bottomfor (y = 0; y < tInfo.height; ++y) {// From left to rightfor (x = 0; x < tInfo.width; ++x) {int a = 255, r = 0, g = 0, b = 0;void *Lpixel = NULL;void *Rpixel = NULL;void *Tpixel = NULL;// Get each pixel by format//红色int mx = x + distent;            if (mx < lInfo.width) {            if (lInfo.format == ANDROID_BITMAP_FORMAT_RGB_565) {                                Lpixel = ((uint16_t *)lPixels) + y * lInfo.width + mx;                                uint16_t v = *(uint16_t *)Lpixel;                                r = RGB565_R(v);                                } else {// RGBA                                Lpixel = ((uint32_t *)lPixels) + y * lInfo.width + mx;                                uint32_t v = *(uint32_t *)Lpixel;                                r = RGBA_R(v);                                }                    //            LOGI("red: %d %d, %d\n", x, y, r);            } else {                r=0;            }            //绿色和蓝色            if (rInfo.format == ANDROID_BITMAP_FORMAT_RGB_565) {                        Rpixel = ((uint16_t *)rPixels) + y * rInfo.width + x;                        uint16_t v = *(uint16_t *)Rpixel;                        g = RGB565_G(v);                                        b = RGB565_B(v);                        } else {// RGBA                        Rpixel = ((uint32_t *)rPixels) + y * rInfo.width + x;                        uint32_t v = *(uint32_t *)Rpixel;                        g = RGBA_G(v);                                        b = RGBA_B(v);                        }//                        LOGI("gb: %d %d, %d %d \n", x, y, g,b);            //目标图片            if (tInfo.format == ANDROID_BITMAP_FORMAT_RGB_565) {                                    Tpixel = ((uint16_t *)tPixels) + y * tInfo.width + x;                                    } else {// RGBA                                    Tpixel = ((uint32_t *)tPixels) + y * tInfo.width + x;                                    }            //预测 真实            //r    b            //g    g// Write the pixel backif (tInfo.format == ANDROID_BITMAP_FORMAT_RGB_565) {*((uint16_t *)Tpixel) = MAKE_RGB565(r, g, b);} else {// RGBA*((uint32_t *)Tpixel) = MAKE_RGBA(r, g, b, a);}}}AndroidBitmap_unlockPixels(env, leftBitmap_Red);AndroidBitmap_unlockPixels(env, rightBitmap_GreenBlue);AndroidBitmap_unlockPixels(env, tagBitmap);  }

转载请注明出处。

更多相关文章

随机推荐