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implement c module, refract code structure
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,132 @@ | ||
| /** | ||
| * implement for c module plugin png | ||
| * developed by devseed | ||
| */ | ||
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| #include <stdio.h> | ||
| #include <string.h> | ||
| #include "plugin.h" | ||
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| #define STB_IMAGE_IMPLEMENTATION | ||
| #include "stb_image.h" | ||
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| #if defined(_MSC_VER) || defined(__TINYC__) | ||
| #ifndef EXPORT | ||
| #define EXPORT __declspec(dllexport) | ||
| #endif | ||
| #else | ||
| #ifndef EXPORT | ||
| #define EXPORT __attribute__((visibility("default"))) | ||
| #endif | ||
| #endif | ||
|
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| static char s_msg[4096] = {0}; | ||
| static stbi_uc *g_img = NULL; | ||
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| PLUGIN_STATUS decode_open(const char *name, void **context) | ||
| { | ||
| s_msg[0] = '\0'; | ||
| sprintf(s_msg, "[cmodule:png] open %s, version v0.1", name); | ||
| if(s_msg[strlen(s_msg) - 1] =='\n') s_msg[strlen(s_msg) - 1] = '\0'; | ||
| return STATUS_OK; | ||
| } | ||
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| PLUGIN_STATUS decode_close(void *context) | ||
| { | ||
| return STATUS_OK; | ||
| } | ||
|
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| static bool decode_offset_default(void *context, | ||
| const struct tilepos_t *pos, const struct tilefmt_t *fmt, size_t *offset) | ||
| { | ||
| // no safety check for pointer here | ||
| int i = pos->i, x = pos->x, y = pos->y; | ||
| size_t w = fmt->w, h = fmt->h; | ||
| size_t nbytes = fmt->nbytes; | ||
| uint8_t bpp = fmt->bpp; | ||
|
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| size_t offset1 = i * nbytes; | ||
| size_t offset2 = (x + y * w) * bpp / 8; | ||
| *offset = offset1 + offset2; | ||
|
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| return true; | ||
| } | ||
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| PLUGIN_STATUS decode_pixel(void *context, | ||
| const uint8_t* data, size_t datasize, | ||
| const struct tilepos_t *pos, const struct tilefmt_t *fmt, | ||
| struct pixel_t *pixel, bool remain_index) | ||
| { | ||
| // find decode offset | ||
| uint8_t bpp = fmt->bpp; | ||
| size_t offset = 0; | ||
| if(!decode_offset_default(context, pos, fmt, &offset)) return STATUS_RANGERROR; | ||
| if(offset + bpp/8 >= fmt->nbytes ) return STATUS_RANGERROR; | ||
|
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| // try decode in different bpp | ||
| if(bpp==32) // rgba8888 | ||
| { | ||
| memcpy(pixel, g_img + offset, 4); | ||
| } | ||
| else if(bpp==24) // rgb888 | ||
| { | ||
| memcpy(pixel, g_img + offset, 3); | ||
| if(!remain_index) pixel->a = 255; | ||
| } | ||
| return STATUS_OK; | ||
| } | ||
|
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| PLUGIN_STATUS decode_pre(void *context, | ||
| const uint8_t* rawdata, size_t rawsize, struct tilecfg_t *cfg) | ||
| { | ||
| s_msg[0] = '\0'; | ||
|
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| // check size | ||
| size_t datasize = cfg->size; | ||
| if(!datasize) | ||
| { | ||
| datasize = rawsize - cfg->start; | ||
| } | ||
| if(datasize > rawsize - cfg->start) | ||
| { | ||
| datasize = rawsize - cfg->start; | ||
| } | ||
|
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| // decode png | ||
| int w, h, c; | ||
| g_img = stbi_load_from_memory(rawdata + cfg->start, datasize, &w, &h, &c, 0); | ||
| if(!g_img) | ||
| { | ||
| sprintf(s_msg + strlen(s_msg), "[cmoudule:decode_pre] not a png format\n"); | ||
| return STATUS_FAIL; | ||
| } | ||
| sprintf(s_msg + strlen(s_msg), "[cmoudule:decode_pre] png %dx%dx%d\n", w, h, c); | ||
|
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| // change tilefmt | ||
| cfg->bpp = c * 8; | ||
| cfg->w = w; | ||
| cfg->h = h; | ||
| cfg->nrow = 1; | ||
| cfg->nbytes = w*h*c; | ||
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| if(s_msg[strlen(s_msg) - 1] =='\n') s_msg[strlen(s_msg) - 1] = '\0'; | ||
|
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| return STATUS_OK; | ||
| } | ||
|
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| PLUGIN_STATUS decode_post(void *context, | ||
| const uint8_t* rawdata, size_t rawsize, struct tilecfg_t *cfg) | ||
| { | ||
| s_msg[0] = '\0'; | ||
| sprintf(s_msg + strlen(s_msg), "[cmoudule:decode_post] \n"); | ||
| if(s_msg[strlen(s_msg) - 1] =='\n') s_msg[strlen(s_msg) - 1] = '\0'; | ||
| if(g_img) stbi_image_free(g_img); | ||
|
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| return STATUS_OK; | ||
| } | ||
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| EXPORT struct tile_decoder_t decoder = { | ||
| .open = decode_open, .close = decode_close, | ||
| .decode = decode_pixel, | ||
| .pre = decode_pre, .post=decode_post, .msg = s_msg | ||
| }; |
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