660 lines
18 KiB
C
660 lines
18 KiB
C
#include "gifdec.h"
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#include "../../../misc/lv_log.h"
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#include "../../../misc/lv_mem.h"
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#include "../../../misc/lv_color.h"
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#if LV_USE_GIF
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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#define MIN(A, B) ((A) < (B) ? (A) : (B))
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#define MAX(A, B) ((A) > (B) ? (A) : (B))
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typedef struct Entry {
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uint16_t length;
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uint16_t prefix;
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uint8_t suffix;
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} Entry;
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typedef struct Table {
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int bulk;
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int nentries;
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Entry *entries;
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} Table;
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static gd_GIF * gif_open(gd_GIF * gif);
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static bool f_gif_open(gd_GIF * gif, const void * path, bool is_file);
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static void f_gif_read(gd_GIF * gif, void * buf, size_t len);
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static int f_gif_seek(gd_GIF * gif, size_t pos, int k);
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static void f_gif_close(gd_GIF * gif);
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static uint16_t
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read_num(gd_GIF * gif)
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{
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uint8_t bytes[2];
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f_gif_read(gif, bytes, 2);
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return bytes[0] + (((uint16_t) bytes[1]) << 8);
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}
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gd_GIF *
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gd_open_gif_file(const char *fname)
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{
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gd_GIF gif_base;
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memset(&gif_base, 0, sizeof(gif_base));
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bool res = f_gif_open(&gif_base, fname, true);
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if(!res) return NULL;
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return gif_open(&gif_base);
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}
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gd_GIF *
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gd_open_gif_data(const void *data)
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{
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gd_GIF gif_base;
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memset(&gif_base, 0, sizeof(gif_base));
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bool res = f_gif_open(&gif_base, data, false);
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if(!res) return NULL;
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return gif_open(&gif_base);
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}
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static gd_GIF * gif_open(gd_GIF * gif_base)
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{
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uint8_t sigver[3];
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uint16_t width, height, depth;
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uint8_t fdsz, bgidx, aspect;
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int i;
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uint8_t *bgcolor;
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int gct_sz;
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gd_GIF *gif = NULL;
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/* Header */
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f_gif_read(gif_base, sigver, 3);
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if (memcmp(sigver, "GIF", 3) != 0) {
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LV_LOG_WARN("invalid signature\n");
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goto fail;
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}
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/* Version */
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f_gif_read(gif_base, sigver, 3);
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if (memcmp(sigver, "89a", 3) != 0) {
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LV_LOG_WARN("invalid version\n");
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goto fail;
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}
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/* Width x Height */
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width = read_num(gif_base);
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height = read_num(gif_base);
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/* FDSZ */
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f_gif_read(gif_base, &fdsz, 1);
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/* Presence of GCT */
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if (!(fdsz & 0x80)) {
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LV_LOG_WARN("no global color table\n");
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goto fail;
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}
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/* Color Space's Depth */
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depth = ((fdsz >> 4) & 7) + 1;
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/* Ignore Sort Flag. */
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/* GCT Size */
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gct_sz = 1 << ((fdsz & 0x07) + 1);
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/* Background Color Index */
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f_gif_read(gif_base, &bgidx, 1);
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/* Aspect Ratio */
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f_gif_read(gif_base, &aspect, 1);
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/* Create gd_GIF Structure. */
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#if LV_COLOR_DEPTH == 32
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gif = lv_mem_alloc(sizeof(gd_GIF) + 5 * width * height);
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#elif LV_COLOR_DEPTH == 16
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gif = lv_mem_alloc(sizeof(gd_GIF) + 4 * width * height);
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#elif LV_COLOR_DEPTH == 8 || LV_COLOR_DEPTH == 1
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gif = lv_mem_alloc(sizeof(gd_GIF) + 3 * width * height);
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#endif
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if (!gif) goto fail;
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memcpy(gif, gif_base, sizeof(gd_GIF));
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gif->width = width;
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gif->height = height;
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gif->depth = depth;
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/* Read GCT */
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gif->gct.size = gct_sz;
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f_gif_read(gif, gif->gct.colors, 3 * gif->gct.size);
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gif->palette = &gif->gct;
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gif->bgindex = bgidx;
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gif->canvas = (uint8_t *) &gif[1];
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#if LV_COLOR_DEPTH == 32
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gif->frame = &gif->canvas[4 * width * height];
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#elif LV_COLOR_DEPTH == 16
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gif->frame = &gif->canvas[3 * width * height];
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#elif LV_COLOR_DEPTH == 8 || LV_COLOR_DEPTH == 1
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gif->frame = &gif->canvas[2 * width * height];
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#endif
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if (gif->bgindex) {
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memset(gif->frame, gif->bgindex, gif->width * gif->height);
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}
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bgcolor = &gif->palette->colors[gif->bgindex*3];
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for (i = 0; i < gif->width * gif->height; i++) {
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#if LV_COLOR_DEPTH == 32
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gif->canvas[i*4 + 0] = *(bgcolor + 2);
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gif->canvas[i*4 + 1] = *(bgcolor + 1);
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gif->canvas[i*4 + 2] = *(bgcolor + 0);
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gif->canvas[i*4 + 3] = 0xff;
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#elif LV_COLOR_DEPTH == 16
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lv_color_t c = lv_color_make(*(bgcolor + 0), *(bgcolor + 1), *(bgcolor + 2));
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gif->canvas[i*3 + 0] = c.full & 0xff;
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gif->canvas[i*3 + 1] = (c.full >> 8) & 0xff;
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gif->canvas[i*3 + 2] = 0xff;
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#elif LV_COLOR_DEPTH == 8
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lv_color_t c = lv_color_make(*(bgcolor + 0), *(bgcolor + 1), *(bgcolor + 2));
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gif->canvas[i*2 + 0] = c.full;
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gif->canvas[i*2 + 1] = 0xff;
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#elif LV_COLOR_DEPTH == 1
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lv_color_t c = lv_color_make(*(bgcolor + 0), *(bgcolor + 1), *(bgcolor + 2));
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gif->canvas[i*2 + 0] = c.ch.red > 128 ? 1 : 0;
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gif->canvas[i*2 + 1] = 0xff;
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#endif
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}
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gif->anim_start = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
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goto ok;
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fail:
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f_gif_close(gif_base);
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ok:
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return gif;
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}
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static void
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discard_sub_blocks(gd_GIF *gif)
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{
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uint8_t size;
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do {
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f_gif_read(gif, &size, 1);
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f_gif_seek(gif, size, LV_FS_SEEK_CUR);
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} while (size);
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}
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static void
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read_plain_text_ext(gd_GIF *gif)
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{
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if (gif->plain_text) {
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uint16_t tx, ty, tw, th;
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uint8_t cw, ch, fg, bg;
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size_t sub_block;
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f_gif_seek(gif, 1, LV_FS_SEEK_CUR); /* block size = 12 */
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tx = read_num(gif);
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ty = read_num(gif);
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tw = read_num(gif);
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th = read_num(gif);
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f_gif_read(gif, &cw, 1);
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f_gif_read(gif, &ch, 1);
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f_gif_read(gif, &fg, 1);
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f_gif_read(gif, &bg, 1);
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sub_block = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
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gif->plain_text(gif, tx, ty, tw, th, cw, ch, fg, bg);
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f_gif_seek(gif, sub_block, LV_FS_SEEK_SET);
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} else {
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/* Discard plain text metadata. */
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f_gif_seek(gif, 13, LV_FS_SEEK_CUR);
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}
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/* Discard plain text sub-blocks. */
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discard_sub_blocks(gif);
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}
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static void
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read_graphic_control_ext(gd_GIF *gif)
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{
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uint8_t rdit;
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/* Discard block size (always 0x04). */
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f_gif_seek(gif, 1, LV_FS_SEEK_CUR);
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f_gif_read(gif, &rdit, 1);
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gif->gce.disposal = (rdit >> 2) & 3;
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gif->gce.input = rdit & 2;
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gif->gce.transparency = rdit & 1;
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gif->gce.delay = read_num(gif);
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f_gif_read(gif, &gif->gce.tindex, 1);
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/* Skip block terminator. */
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f_gif_seek(gif, 1, LV_FS_SEEK_CUR);
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}
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static void
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read_comment_ext(gd_GIF *gif)
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{
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if (gif->comment) {
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size_t sub_block = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
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gif->comment(gif);
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f_gif_seek(gif, sub_block, LV_FS_SEEK_SET);
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}
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/* Discard comment sub-blocks. */
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discard_sub_blocks(gif);
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}
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static void
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read_application_ext(gd_GIF *gif)
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{
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char app_id[8];
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char app_auth_code[3];
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/* Discard block size (always 0x0B). */
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f_gif_seek(gif, 1, LV_FS_SEEK_CUR);
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/* Application Identifier. */
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f_gif_read(gif, app_id, 8);
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/* Application Authentication Code. */
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f_gif_read(gif, app_auth_code, 3);
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if (!strncmp(app_id, "NETSCAPE", sizeof(app_id))) {
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/* Discard block size (0x03) and constant byte (0x01). */
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f_gif_seek(gif, 2, LV_FS_SEEK_CUR);
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gif->loop_count = read_num(gif);
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/* Skip block terminator. */
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f_gif_seek(gif, 1, LV_FS_SEEK_CUR);
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} else if (gif->application) {
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size_t sub_block = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
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gif->application(gif, app_id, app_auth_code);
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f_gif_seek(gif, sub_block, LV_FS_SEEK_SET);
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discard_sub_blocks(gif);
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} else {
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discard_sub_blocks(gif);
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}
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}
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static void
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read_ext(gd_GIF *gif)
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{
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uint8_t label;
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f_gif_read(gif, &label, 1);
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switch (label) {
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case 0x01:
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read_plain_text_ext(gif);
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break;
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case 0xF9:
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read_graphic_control_ext(gif);
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break;
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case 0xFE:
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read_comment_ext(gif);
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break;
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case 0xFF:
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read_application_ext(gif);
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break;
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default:
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LV_LOG_WARN("unknown extension: %02X\n", label);
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}
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}
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static Table *
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new_table(int key_size)
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{
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int key;
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int init_bulk = MAX(1 << (key_size + 1), 0x100);
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Table *table = lv_mem_alloc(sizeof(*table) + sizeof(Entry) * init_bulk);
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if (table) {
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table->bulk = init_bulk;
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table->nentries = (1 << key_size) + 2;
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table->entries = (Entry *) &table[1];
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for (key = 0; key < (1 << key_size); key++)
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table->entries[key] = (Entry) {1, 0xFFF, key};
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}
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return table;
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}
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/* Add table entry. Return value:
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* 0 on success
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* +1 if key size must be incremented after this addition
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* -1 if could not realloc table */
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static int
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add_entry(Table **tablep, uint16_t length, uint16_t prefix, uint8_t suffix)
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{
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Table *table = *tablep;
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if (table->nentries == table->bulk) {
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table->bulk *= 2;
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table = lv_mem_realloc(table, sizeof(*table) + sizeof(Entry) * table->bulk);
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if (!table) return -1;
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table->entries = (Entry *) &table[1];
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*tablep = table;
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}
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table->entries[table->nentries] = (Entry) {length, prefix, suffix};
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table->nentries++;
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if ((table->nentries & (table->nentries - 1)) == 0)
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return 1;
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return 0;
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}
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static uint16_t
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get_key(gd_GIF *gif, int key_size, uint8_t *sub_len, uint8_t *shift, uint8_t *byte)
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{
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int bits_read;
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int rpad;
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int frag_size;
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uint16_t key;
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key = 0;
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for (bits_read = 0; bits_read < key_size; bits_read += frag_size) {
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rpad = (*shift + bits_read) % 8;
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if (rpad == 0) {
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/* Update byte. */
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if (*sub_len == 0) {
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f_gif_read(gif, sub_len, 1); /* Must be nonzero! */
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if (*sub_len == 0) return 0x1000;
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}
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f_gif_read(gif, byte, 1);
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(*sub_len)--;
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}
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frag_size = MIN(key_size - bits_read, 8 - rpad);
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key |= ((uint16_t) ((*byte) >> rpad)) << bits_read;
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}
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/* Clear extra bits to the left. */
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key &= (1 << key_size) - 1;
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*shift = (*shift + key_size) % 8;
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return key;
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}
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/* Compute output index of y-th input line, in frame of height h. */
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static int
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interlaced_line_index(int h, int y)
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{
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int p; /* number of lines in current pass */
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p = (h - 1) / 8 + 1;
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if (y < p) /* pass 1 */
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return y * 8;
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y -= p;
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p = (h - 5) / 8 + 1;
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if (y < p) /* pass 2 */
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return y * 8 + 4;
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y -= p;
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p = (h - 3) / 4 + 1;
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if (y < p) /* pass 3 */
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return y * 4 + 2;
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y -= p;
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/* pass 4 */
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return y * 2 + 1;
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}
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/* Decompress image pixels.
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* Return 0 on success or -1 on out-of-memory (w.r.t. LZW code table). */
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static int
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read_image_data(gd_GIF *gif, int interlace)
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{
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uint8_t sub_len, shift, byte;
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int init_key_size, key_size, table_is_full=0;
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int frm_off, frm_size, str_len=0, i, p, x, y;
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uint16_t key, clear, stop;
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int ret;
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Table *table;
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Entry entry = {0};
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size_t start, end;
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f_gif_read(gif, &byte, 1);
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key_size = (int) byte;
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start = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
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discard_sub_blocks(gif);
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end = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
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f_gif_seek(gif, start, LV_FS_SEEK_SET);
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clear = 1 << key_size;
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stop = clear + 1;
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table = new_table(key_size);
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key_size++;
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init_key_size = key_size;
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sub_len = shift = 0;
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key = get_key(gif, key_size, &sub_len, &shift, &byte); /* clear code */
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frm_off = 0;
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ret = 0;
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frm_size = gif->fw*gif->fh;
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while (frm_off < frm_size) {
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if (key == clear) {
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key_size = init_key_size;
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table->nentries = (1 << (key_size - 1)) + 2;
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table_is_full = 0;
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} else if (!table_is_full) {
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ret = add_entry(&table, str_len + 1, key, entry.suffix);
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if (ret == -1) {
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lv_mem_free(table);
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return -1;
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}
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if (table->nentries == 0x1000) {
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ret = 0;
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table_is_full = 1;
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}
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}
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key = get_key(gif, key_size, &sub_len, &shift, &byte);
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if (key == clear) continue;
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if (key == stop || key == 0x1000) break;
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if (ret == 1) key_size++;
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entry = table->entries[key];
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str_len = entry.length;
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for (i = 0; i < str_len; i++) {
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p = frm_off + entry.length - 1;
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x = p % gif->fw;
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y = p / gif->fw;
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if (interlace)
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y = interlaced_line_index((int) gif->fh, y);
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gif->frame[(gif->fy + y) * gif->width + gif->fx + x] = entry.suffix;
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if (entry.prefix == 0xFFF)
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break;
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else
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entry = table->entries[entry.prefix];
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}
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frm_off += str_len;
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if (key < table->nentries - 1 && !table_is_full)
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table->entries[table->nentries - 1].suffix = entry.suffix;
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}
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lv_mem_free(table);
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if (key == stop) f_gif_read(gif, &sub_len, 1); /* Must be zero! */
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f_gif_seek(gif, end, LV_FS_SEEK_SET);
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return 0;
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}
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/* Read image.
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* Return 0 on success or -1 on out-of-memory (w.r.t. LZW code table). */
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static int
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read_image(gd_GIF *gif)
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{
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uint8_t fisrz;
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int interlace;
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/* Image Descriptor. */
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gif->fx = read_num(gif);
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gif->fy = read_num(gif);
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gif->fw = read_num(gif);
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gif->fh = read_num(gif);
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f_gif_read(gif, &fisrz, 1);
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interlace = fisrz & 0x40;
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/* Ignore Sort Flag. */
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/* Local Color Table? */
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if (fisrz & 0x80) {
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/* Read LCT */
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gif->lct.size = 1 << ((fisrz & 0x07) + 1);
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f_gif_read(gif, gif->lct.colors, 3 * gif->lct.size);
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gif->palette = &gif->lct;
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} else
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gif->palette = &gif->gct;
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/* Image Data. */
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return read_image_data(gif, interlace);
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}
|
|
|
|
static void
|
|
render_frame_rect(gd_GIF *gif, uint8_t *buffer)
|
|
{
|
|
int i, j, k;
|
|
uint8_t index, *color;
|
|
i = gif->fy * gif->width + gif->fx;
|
|
for (j = 0; j < gif->fh; j++) {
|
|
for (k = 0; k < gif->fw; k++) {
|
|
index = gif->frame[(gif->fy + j) * gif->width + gif->fx + k];
|
|
color = &gif->palette->colors[index*3];
|
|
if (!gif->gce.transparency || index != gif->gce.tindex) {
|
|
#if LV_COLOR_DEPTH == 32
|
|
buffer[(i+k)*4 + 0] = *(color + 2);
|
|
buffer[(i+k)*4 + 1] = *(color + 1);
|
|
buffer[(i+k)*4 + 2] = *(color + 0);
|
|
buffer[(i+k)*4 + 3] = 0xFF;
|
|
#elif LV_COLOR_DEPTH == 16
|
|
lv_color_t c = lv_color_make(*(color + 0), *(color + 1), *(color + 2));
|
|
buffer[(i+k)*3 + 0] = c.full & 0xff;
|
|
buffer[(i+k)*3 + 1] = (c.full >> 8) & 0xff;
|
|
buffer[(i+k)*3 + 2] = 0xff;
|
|
#elif LV_COLOR_DEPTH == 8
|
|
lv_color_t c = lv_color_make(*(color + 0), *(color + 1), *(color + 2));
|
|
buffer[(i+k)*2 + 0] = c.full;
|
|
buffer[(i+k)*2 + 1] = 0xff;
|
|
#elif LV_COLOR_DEPTH == 1
|
|
uint8_t b = (*(color + 0)) | (*(color + 1)) | (*(color + 2));
|
|
buffer[(i+k)*2 + 0] = b > 128 ? 1 : 0;
|
|
buffer[(i+k)*2 + 1] = 0xff;
|
|
#endif
|
|
}
|
|
}
|
|
i += gif->width;
|
|
}
|
|
}
|
|
|
|
static void
|
|
dispose(gd_GIF *gif)
|
|
{
|
|
int i, j, k;
|
|
uint8_t *bgcolor;
|
|
switch (gif->gce.disposal) {
|
|
case 2: /* Restore to background color. */
|
|
bgcolor = &gif->palette->colors[gif->bgindex*3];
|
|
|
|
uint8_t opa = 0xff;
|
|
if(gif->gce.transparency) opa = 0x00;
|
|
|
|
i = gif->fy * gif->width + gif->fx;
|
|
for (j = 0; j < gif->fh; j++) {
|
|
for (k = 0; k < gif->fw; k++) {
|
|
#if LV_COLOR_DEPTH == 32
|
|
gif->canvas[(i+k)*4 + 0] = *(bgcolor + 2);
|
|
gif->canvas[(i+k)*4 + 1] = *(bgcolor + 1);
|
|
gif->canvas[(i+k)*4 + 2] = *(bgcolor + 0);
|
|
gif->canvas[(i+k)*4 + 3] = opa;
|
|
#elif LV_COLOR_DEPTH == 16
|
|
lv_color_t c = lv_color_make(*(bgcolor + 0), *(bgcolor + 1), *(bgcolor + 2));
|
|
gif->canvas[(i+k)*3 + 0] = c.full & 0xff;
|
|
gif->canvas[(i+k)*3 + 1] = (c.full >> 8) & 0xff;
|
|
gif->canvas[(i+k)*3 + 2] = opa;
|
|
#elif LV_COLOR_DEPTH == 8
|
|
lv_color_t c = lv_color_make(*(bgcolor + 0), *(bgcolor + 1), *(bgcolor + 2));
|
|
gif->canvas[(i+k)*2 + 0] = c.full;
|
|
gif->canvas[(i+k)*2 + 1] = opa;
|
|
#elif LV_COLOR_DEPTH == 1
|
|
uint8_t b = (*(bgcolor + 0)) | (*(bgcolor + 1)) | (*(bgcolor + 2));
|
|
gif->canvas[(i+k)*2 + 0] = b > 128 ? 1 : 0;
|
|
gif->canvas[(i+k)*2 + 1] = opa;
|
|
#endif
|
|
}
|
|
i += gif->width;
|
|
}
|
|
break;
|
|
case 3: /* Restore to previous, i.e., don't update canvas.*/
|
|
break;
|
|
default:
|
|
/* Add frame non-transparent pixels to canvas. */
|
|
render_frame_rect(gif, gif->canvas);
|
|
}
|
|
}
|
|
|
|
/* Return 1 if got a frame; 0 if got GIF trailer; -1 if error. */
|
|
int
|
|
gd_get_frame(gd_GIF *gif)
|
|
{
|
|
char sep;
|
|
|
|
dispose(gif);
|
|
f_gif_read(gif, &sep, 1);
|
|
while (sep != ',') {
|
|
if (sep == ';')
|
|
return 0;
|
|
if (sep == '!')
|
|
read_ext(gif);
|
|
else return -1;
|
|
f_gif_read(gif, &sep, 1);
|
|
}
|
|
if (read_image(gif) == -1)
|
|
return -1;
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
gd_render_frame(gd_GIF *gif, uint8_t *buffer)
|
|
{
|
|
// uint32_t i;
|
|
// uint32_t j;
|
|
// for(i = 0, j = 0; i < gif->width * gif->height * 3; i+= 3, j+=4) {
|
|
// buffer[j + 0] = gif->canvas[i + 2];
|
|
// buffer[j + 1] = gif->canvas[i + 1];
|
|
// buffer[j + 2] = gif->canvas[i + 0];
|
|
// buffer[j + 3] = 0xFF;
|
|
// }
|
|
// memcpy(buffer, gif->canvas, gif->width * gif->height * 3);
|
|
render_frame_rect(gif, buffer);
|
|
}
|
|
|
|
void
|
|
gd_rewind(gd_GIF *gif)
|
|
{
|
|
f_gif_seek(gif, gif->anim_start, LV_FS_SEEK_SET);
|
|
}
|
|
|
|
void
|
|
gd_close_gif(gd_GIF *gif)
|
|
{
|
|
f_gif_close(gif);
|
|
lv_mem_free(gif);
|
|
}
|
|
|
|
static bool f_gif_open(gd_GIF * gif, const void * path, bool is_file)
|
|
{
|
|
gif->f_rw_p = 0;
|
|
gif->data = NULL;
|
|
gif->is_file = is_file;
|
|
|
|
if(is_file) {
|
|
lv_fs_res_t res = lv_fs_open(&gif->fd, path, LV_FS_MODE_RD);
|
|
if(res != LV_FS_RES_OK) return false;
|
|
else return true;
|
|
} else {
|
|
gif->data = path;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
static void f_gif_read(gd_GIF * gif, void * buf, size_t len)
|
|
{
|
|
if(gif->is_file) {
|
|
lv_fs_read(&gif->fd, buf, len, NULL);
|
|
} else
|
|
{
|
|
memcpy(buf, &gif->data[gif->f_rw_p], len);
|
|
gif->f_rw_p += len;
|
|
}
|
|
}
|
|
|
|
static int f_gif_seek(gd_GIF * gif, size_t pos, int k)
|
|
{
|
|
if(gif->is_file) {
|
|
lv_fs_seek(&gif->fd, pos, k);
|
|
uint32_t x;
|
|
lv_fs_tell(&gif->fd, &x);
|
|
return x;
|
|
} else {
|
|
if(k == LV_FS_SEEK_CUR) gif->f_rw_p += pos;
|
|
else if(k == LV_FS_SEEK_SET) gif->f_rw_p = pos;
|
|
return gif->f_rw_p;
|
|
}
|
|
}
|
|
|
|
static void f_gif_close(gd_GIF * gif)
|
|
{
|
|
if(gif->is_file) {
|
|
lv_fs_close(&gif->fd);
|
|
}
|
|
}
|
|
|
|
#endif /*LV_USE_GIF*/
|