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#include "ALLinclude.h"
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#define GIF_MAX_FRAME_SIZE (80 * 160) // 假设每帧最大80x160像素
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#define GIF_FRAME_COUNT 10 // 假设GIF有10帧
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#define LZW_MAX_DICT_SIZE 4096 // LZW字典最大大小
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#define SCREEN_WIDTH 80
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#define SCREEN_HEIGHT 160
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#define MAX_COLORS 64
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#define LZW_DICT_SIZE 1024
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#define RGB888_TO_RGB565(r, g, b) \
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((((r) >> 3) << 11) | (((g) >> 2) << 5) | ((b) >> 3))
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// GIF全局色彩表的定义，最多支持256种颜色，每种颜色3字节（RGB）
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uint8_t global_color_table[256][3];
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// 每一帧的图像数据存放
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uint8_t frame_buffer[GIF_MAX_FRAME_SIZE];
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// GIF文件解析结构
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typedef struct {
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uint16_t width;
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uint16_t height;
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uint8_t global_color_table_flag;
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uint8_t global_color_table_size;
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uint8_t background_color_index;
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uint8_t pixel_aspect_ratio;
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const uint8_t *data; // 存储GIF的原始数据
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uint32_t offset; // 当前解析的位置
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} GIFFile;
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// LZW解码字典结构
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typedef struct {
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uint16_t code_size;
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uint16_t dictionary[LZW_MAX_DICT_SIZE][2]; // LZW字典
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uint16_t next_code;
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} LZWDecoder;
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// 解析GIF的全局色彩表
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void parseGlobalColorTable(const uint8_t* gif_data, uint16_t color_table_size) {
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for (uint16_t i = 0; i < color_table_size; i++) {
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global_color_table[i][0] = gif_data[i * 3];
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global_color_table[i][1] = gif_data[i * 3 + 1];
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global_color_table[i][2] = gif_data[i * 3 + 2];
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#if DebugPrintEnable == 1
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printf("Color %d: R=%d, G=%d, B=%d\n", i, global_color_table[i][0], global_color_table[i][1], global_color_table[i][2]); // Debug print
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#endif
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}
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}
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// 读取GIF的头部信息并初始化GIFFile结构体
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void readGIFHeader(GIFFile* gif_file, const uint8_t *gif_address) {
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const uint8_t* gif_data = gif_address;
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gif_file->data = gif_data;
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gif_file->width = gif_data[6] | (gif_data[7] << 8); // 解析宽度 (小端字节序)
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gif_file->height = gif_data[8] | (gif_data[9] << 8); // 解析高度 (小端字节序)
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#if DebugPrintEnable == 1
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printf("GIF Header: Width = %d, Height = %d\n", gif_file->width, gif_file->height);
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#endif
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gif_file->global_color_table_flag = (gif_data[10] & 0x80) >> 7;
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gif_file->global_color_table_size = 2 << (gif_data[10] & 0x07); // 获取色彩表大小
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gif_file->background_color_index = gif_data[11];
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gif_file->pixel_aspect_ratio = gif_data[12];
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gif_file->offset = 13;
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if (gif_file->global_color_table_flag) {
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const uint8_t* color_table_data = gif_address + gif_file->offset;
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parseGlobalColorTable(color_table_data, gif_file->global_color_table_size);
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gif_file->offset += gif_file->global_color_table_size * 3;
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}
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}
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// LZW解码函数
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void LZWInit(LZWDecoder* decoder, const uint8_t* gif_data, uint32_t* offset) {
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decoder->code_size = gif_data[*offset];
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(*offset)++;
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decoder->next_code = 258;
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memset(decoder->dictionary, 0, sizeof(decoder->dictionary));
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#if DebugPrintEnable == 1
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printf("LZW Decoder Initialized: Code size = %d\n", decoder->code_size);
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#endif
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}
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// 解码LZW数据并填充frame_buffer
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void LZWDecode(LZWDecoder* decoder, const uint8_t* gif_data, uint32_t* offset, uint8_t* frame_buffer) {
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uint32_t current_code = 0, previous_code = 0;
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uint8_t stack[GIF_MAX_FRAME_SIZE];
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uint32_t stack_pointer = 0;
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uint16_t code_size = decoder->code_size;
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#if DebugPrintEnable == 1
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printf("Starting LZW decoding...\n"); // 调试输出，开始解码
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#endif
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// LZW解码循环
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while (1) {
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current_code = gif_data[*offset];
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(*offset)++;
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stack[stack_pointer++] = current_code;
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#if DebugPrintEnable == 1
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printf("LZW Decode: Read code = 0x%02X\n", current_code);
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#endif
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if (current_code == 0xFF) break; // Assuming 0xFF marks the end of frame data
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}
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// 填充frame_buffer
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for (uint32_t i = 0; i < stack_pointer; i++) {
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frame_buffer[i] = stack[i];
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}
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#if DebugPrintEnable == 1
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printf("Frame decoded, %d bytes filled into frame_buffer\n", stack_pointer);
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#endif
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}
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// 解码每一帧GIF并显示
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void decodeFrame(GIFFile* gif_file, uint32_t* current_offset) {
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const uint8_t* gif_data = gif_file->data;
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LZWDecoder decoder;
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#if DebugPrintEnable == 1
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if (gif_file == NULL) {
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printf("Error: gif_file is NULL\n");
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return;
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}
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if (gif_data == NULL) {
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printf("Error: gif_data in gif_file is NULL\n");
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return;
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}
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if (current_offset == NULL) {
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printf("Error: current_offset is NULL\n");
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return;
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}
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// printf("Decoding frame, current_offset = %u\n", *current_offset);
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#endif
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LZWInit(&decoder, gif_data, current_offset);
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#if DebugPrintEnable == 1
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printf("Decoding frame, current_offset = %u\n", *current_offset);
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#endif
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LZWDecode(&decoder, gif_data, current_offset, frame_buffer);
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#if DebugPrintEnable == 1
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printf("Frame decoded, current_offset = %u\n", *current_offset);
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printf("First 10 bytes of frame_buffer: ");
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for (int i = 0; i < 10; i++) {
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printf("0x%02X ", frame_buffer[i]);
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}
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printf("\n");
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#endif
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}
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// 显示解码后的图像帧
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// 显示解码后的图像帧
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void displayFrame(uint8_t* frame_data, const GIFFile* gif_file) {
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LCD_Clear(WHITE); // 清空屏幕
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for (int i = 0; i < GIF_MAX_FRAME_SIZE; i++) {
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uint8_t color_idx = frame_data[i];
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// 确保颜色索引不越界
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uint8_t r,g,b;
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if (color_idx < gif_file->global_color_table_size) {
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r = global_color_table[color_idx][0];
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g = global_color_table[color_idx][1];
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b = global_color_table[color_idx][2];
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// 显示该像素
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uint16_t color = RGB888_TO_RGB565(r, g, b);
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LCDSetPointColor(i % SCREEN_WIDTH, i / SCREEN_WIDTH, color);
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}
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#if DebugPrintEnable == 1
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if (i < 10) { // Only print the first few for brevity
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printf("Pixel %d: ColorIdx = %d, RGB = (%d, %d, %d)\n", i, color_idx, r, g, b);
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}
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#endif
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}
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#if DebugPrintEnable == 1
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printf("Frame displayed\n");
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#endif
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}
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// 显示GIF动画
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void gif_play(void) {
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uint32_t gif_data_address = 0x08010000;
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uint32_t current_offset = 0;
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GIFFile gif_file;
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readGIFHeader(&gif_file, (const uint8_t*)&Loading_map[0]);
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#if DebugPrintEnable == 1
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printf("Starting GIF play\n");
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#endif
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for (int frame = 0; frame < GIF_FRAME_COUNT; frame++) {
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decodeFrame(&gif_file, ¤t_offset);
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displayFrame(frame_buffer, &gif_file); // 传递 gif_file 给 displayFrame
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vTaskDelay(25);
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#if DebugPrintEnable == 1
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printf("Frame %d displayed, waiting for next frame\n", frame + 1);
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#endif
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}
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}
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