| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | #include <stdlib.h> | ||
| 2 | |||
| 3 | #include "image.h" | ||
| 4 | |||
| 5 | |||
| 6 | |||
| 7 | /** | ||
| 8 | * Compute the total size in bytes of an image's pixel buffer. | ||
| 9 | * | ||
| 10 | * @param image Pointer to the image whose buffer size will be computed. | ||
| 11 | * | ||
| 12 | * @returns Total number of bytes required for the image's pixel buffer | ||
| 13 | * (width * height * bpp). | ||
| 14 | */ | ||
| 15 | 2 | size_t image_size(const image_t *image) { | |
| 16 |
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2 | if (image == NULL) { |
| 17 | ✗ | return 0; | |
| 18 | } | ||
| 19 | /* cast to size_t before multiplication to prevent overflow */ | ||
| 20 | 2 | return (size_t)image->width * (size_t)image->height * (size_t)image->bpp; | |
| 21 | } | ||
| 22 | |||
| 23 | |||
| 24 | |||
| 25 | /** | ||
| 26 | * Create an image_t with the given width, height, and bytes-per-pixel, | ||
| 27 | * allocating a pixel buffer. | ||
| 28 | * | ||
| 29 | * The returned image_t fields width, height, and bpp are initialized and | ||
| 30 | * pixels points to a newly allocated buffer of size width * height * bpp. If | ||
| 31 | * allocation fails, pixels will be NULL. | ||
| 32 | * | ||
| 33 | * @param width Image width specified in pixels. | ||
| 34 | * @param height Image height specified in pixels. | ||
| 35 | * @param bpp Bytes per pixel (bytes used to store a single pixel). | ||
| 36 | * | ||
| 37 | * @returns The initialized image_t; its `pixels` member points to the | ||
| 38 | * allocated buffer or NULL on allocation failure. | ||
| 39 | */ | ||
| 40 | 6 | image_t image_create(const unsigned int width, const unsigned int height, const unsigned int bpp) { | |
| 41 | image_t image; | ||
| 42 | |||
| 43 | /* validate image size */ | ||
| 44 |
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6 | if (width == 0 || height == 0 || width > MAX_WIDTH || height > MAX_HEIGHT) { |
| 45 | 3 | image.width = 0; | |
| 46 | 3 | image.height = 0; | |
| 47 | 3 | image.bpp = 0; | |
| 48 | 3 | image.pixels = NULL; | |
| 49 | 3 | return image; | |
| 50 | } | ||
| 51 | |||
| 52 | /* validate image type */ | ||
| 53 |
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3 | if (bpp != GRAYSCALE && bpp != RGB && bpp != RGBA) { |
| 54 | 1 | image.width = 0; | |
| 55 | 1 | image.height = 0; | |
| 56 | 1 | image.bpp = 0; | |
| 57 | 1 | image.pixels = NULL; | |
| 58 | 1 | return image; | |
| 59 | } | ||
| 60 | |||
| 61 | /* initialize image */ | ||
| 62 | 2 | image.width = width; | |
| 63 | 2 | image.height = height; | |
| 64 | 2 | image.bpp = bpp; | |
| 65 | |||
| 66 | /* callers must check that image.pixels != NULL */ | ||
| 67 | 2 | image.pixels = (unsigned char *)malloc(image_size(&image)); | |
| 68 | |||
| 69 | /* make sure the image will be 'zero value' when pixels are not allocated */ | ||
| 70 |
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2 | if (image.pixels == NULL) { |
| 71 | ✗ | image.width = 0; | |
| 72 | ✗ | image.height = 0; | |
| 73 | ✗ | image.bpp = 0; | |
| 74 | } | ||
| 75 | 2 | return image; | |
| 76 | } | ||
| 77 | |||
| 78 |