libjpeg-turbo decoder（libjpeg-turbo 解码器）

显示原文

libjpeg-turbo is a JPEG image codec that uses SIMD instructions to accelerate baseline JPEG compression and decompression on x86, x86-64, Arm, PowerPC, and MIPS systems, as well as progressive JPEG compression on x86, x86-64, and Arm systems.

Detailed introduction: https://libjpeg-turbo.org

Library source: https://github.com/libjpeg-turbo/libjpeg-turbo

libjpeg-turbo 是一个 JPEG 图像编解码器，它使用 SIMD 指令来加速 x86 上的基线 JPEG 压缩和解压缩， x86-64、Arm、PowerPC 和 MIPS 系统，以及 x86、x86-64 和 Arm 系统上的渐进式 JPEG 压缩。

详细介绍：https://libjpeg-turbo.org

库源： https://github.com/libjpeg-turbo/libjpeg-turbo

Install（安装）

sudo apt install libjpeg-turbo8-dev

Add libjpeg-turbo to your project（将 libjpeg-turbo 添加到您的项目中）

find_package(JPEG REQUIRED)
include_directories(${JPEG_INCLUDE_DIR})
target_link_libraries(${PROJECT_NAME} PRIVATE ${JPEG_LIBRARIES})

Usage（用法）

显示原文

Enable LV_USE_LIBJPEG_TURBO in lv_conf.h.

See the examples below. It should be noted that each image of this decoder needs to consume image width x image height x 3 bytes of RAM, and it needs to be combined with the Image caching（图片缓存） feature to ensure that the memory usage is within a reasonable range.

在 lv_conf.h 中启用 LV_USE_LIBJPEG_TURBO 。

请参阅以下示例。

应当注意，该解码器的每个图像需要消耗 图像宽度x图像高度x3 字节的RAM，

它需要与 Image caching（图片缓存）功能相结合，以确保内存使用在合理的范围内。

Example

[English]

Load a JPG image

#include "../../lv_examples.h"
#if LV_BUILD_EXAMPLES

#if LV_USE_LIBJPEG_TURBO

/**
 * Load a JPG image
 */
void lv_example_libjpeg_turbo_1(void)
{
    lv_obj_t * wp;

    wp = lv_image_create(lv_screen_active());
    /* Assuming a File system is attached to letter 'A'
     * E.g. set LV_USE_FS_STDIO 'A' in lv_conf.h */
    lv_image_set_src(wp, "A:lvgl/examples/libs/libjpeg_turbo/flower.jpg");
    lv_obj_center(wp);
}

#else

void lv_example_libjpeg_turbo_1(void)
{
    lv_obj_t * label = lv_label_create(lv_screen_active());
    lv_label_set_text(label, "LibJPEG-Turbo is not installed");
    lv_obj_center(label);
}

#endif

#endif

API

libjpeg_turbo