78 lines
2.0 KiB
C++
78 lines
2.0 KiB
C++
#include "Bitmap.h"
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#include <stddef.h>
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#include <stdlib.h>
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#define STB_IMAGE_IMPLEMENTATION
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#define STB_IMAGE_STATIC
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#define STBI_ONLY_BMP
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#define STBI_ONLY_PNG
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#define STBI_NO_LINEAR
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#define STBI_NO_STDIO
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#include "../external/stb_image.h"
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#include "WindowsWrapper.h"
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#include "File.h"
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unsigned char* DecodeBitmapWithAlpha(const unsigned char *in_buffer, size_t in_buffer_size, unsigned int *width, unsigned int *height, BOOL colour_key)
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{
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int channels_in_file;
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unsigned char *image_buffer = stbi_load_from_memory(in_buffer, in_buffer_size, (int*)width, (int*)height, &channels_in_file, 4);
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if (image_buffer == NULL)
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return NULL;
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// If image has no alpha channel, then perform colour-keying (set #000000 to transparent)
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if (colour_key && channels_in_file == 3)
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for (size_t i = 0; i < *width * *height; ++i)
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if (image_buffer[(i * 4) + 0] == 0 && image_buffer[(i * 4) + 1] == 0 && image_buffer[(i * 4) + 2] == 0)
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image_buffer[(i * 4) + 3] = 0;
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return image_buffer;
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}
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unsigned char* DecodeBitmapWithAlphaFromFile(const char *path, unsigned int *width, unsigned int *height, BOOL colour_key)
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{
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size_t file_size;
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unsigned char *file_buffer = LoadFileToMemory(path, &file_size);
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if (file_buffer != NULL)
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{
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unsigned char *image_buffer = DecodeBitmapWithAlpha(file_buffer, file_size, width, height, colour_key);
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free(file_buffer);
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return image_buffer;
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}
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return NULL;
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}
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unsigned char* DecodeBitmap(const unsigned char *in_buffer, size_t in_buffer_size, unsigned int *width, unsigned int *height)
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{
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return stbi_load_from_memory(in_buffer, in_buffer_size, (int*)width, (int*)height, NULL, 3);
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}
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unsigned char* DecodeBitmapFromFile(const char *path, unsigned int *width, unsigned int *height)
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{
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size_t file_size;
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unsigned char *file_buffer = LoadFileToMemory(path, &file_size);
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if (file_buffer != NULL)
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{
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unsigned char *image_buffer = stbi_load_from_memory(file_buffer, file_size, (int*)width, (int*)height, NULL, 3);
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free(file_buffer);
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return image_buffer;
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}
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return NULL;
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}
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void FreeBitmap(unsigned char *buffer)
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{
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stbi_image_free(buffer);
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}
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