211 lines
5.2 KiB
C
211 lines
5.2 KiB
C
#include "hvif-light.h"
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#include <stdint.h>
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#include <stdlib.h>
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enum
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{
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STYLE_TYPE_SOLID_COLOR = 1,
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STYLE_TYPE_GRADIENT = 2,
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STYLE_TYPE_SOLID_COLOR_NO_ALPHA = 3,
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STYLE_TYPE_SOLID_GRAY = 4,
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STYLE_TYPE_SOLID_GRAY_NO_ALPHA = 5,
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SHAPE_TYPE_PATH_SOURCE = 10,
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TRANSFORMER_TYPE_AFFINE = 20,
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TRANSFORMER_TYPE_CONTOUR = 21,
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TRANSFORMER_TYPE_PERSPECTIVE = 22,
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TRANSFORMER_TYPE_STROKE = 23,
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};
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enum
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{
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GRADIENT_FLAG_TRANSFORM = 1 << 1,
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GRADIENT_FLAG_NO_ALPHA = 1 << 2,
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GRADIENT_FLAG_16_BIT_COLORS = 1 << 3, /* not yet used */
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GRADIENT_FLAG_GRAYS = 1 << 4,
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};
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enum
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{
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PATH_FLAG_CLOSED = 1 << 1,
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PATH_FLAG_USES_COMMANDS = 1 << 2,
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PATH_FLAG_NO_CURVES = 1 << 3,
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};
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enum
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{
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PATH_COMMAND_H_LINE = 0,
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PATH_COMMAND_V_LINE = 1,
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PATH_COMMAND_LINE = 2,
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PATH_COMMAND_CURVE = 3,
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};
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enum
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{
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SHAPE_FLAG_TRANSFORM = 1 << 1,
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SHAPE_FLAG_HINTING = 1 << 2,
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SHAPE_FLAG_LOD_SCALE = 1 << 3,
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SHAPE_FLAG_HAS_TRANSFORMERS = 1 << 4,
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SHAPE_FLAG_TRANSLATION = 1 << 5,
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};
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#define ERROR_RESULT(E) \
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(hvif_result) { .status = E }
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#define SUCCESS_RESULT(I) \
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(hvif_result) { .status = SUCCESS, .image = I }
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#define le_read(V, BUFFER) V = _Generic((V), uint32_t : le_read_uint32)(BUFFER)
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static inline uint32_t
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le_read_uint32(char buffer[static 1])
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{
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return (buffer[0] << 0) | (buffer[1] << 8) | (buffer[2] << 16) |
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(buffer[3] << 24);
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}
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typedef uint32_t hvif_color; /* 8bit each: alpha, blue, green, red */
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#define COLOR_GET_RED(C) (C & 0xff)
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#define COLOR_GET_GREEN(C) ((C >> 8) & 0xff)
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#define COLOR_GET_BLUE(C) ((C >> 16) & 0xff)
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#define COLOR_GET_ALPHA(C) ((C >> 24) & 0xff)
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#define _BM8(N) (0xff << N)
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#define COLOR_SET_RED(C, V) (C = ((C & (~_BM8(0))) | (V & 0xff)))
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#define COLOR_SET_GREEN(C, V) (C = ((C & (~_BM8(8))) | ((V & 0xff) << 8)))
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#define COLOR_SET_BLUE(C, V) (C = ((C & (~_BM8(16))) | ((V & 0xff) << 16)))
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#define COLOR_SET_ALPHA(C, V) (C = ((C & (~_BM8(24))) | ((V & 0xff) << 24)))
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#define COLOR_SET_RGB(C, R, G, B) \
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(C = (C & (~0xffffff)) | (R & 0xff) | ((G & 0xff) << 8) | ((B & 0xff) << 16))
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typedef struct hvif_style hvif_style;
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struct hvif_style
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{
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signed gradient_type;
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uint8_t stops;
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hvif_color* colors;
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float* offsets;
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};
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struct hvif_image
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{
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uint8_t num_styles;
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hvif_style* styles;
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};
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hvif_color
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read_color(char* buffer, bool gray, bool alpha)
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{
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/* On disk a color is:
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red, green, blue, alpha
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Hence reading this as a (little-endian) uint32 result in the desired
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format. If `alpha` is `false` then only three bytes are used and alpha
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is `0xff`. If gray is `true` only one one byte is used for the three
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colors.
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*/
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hvif_color c = 0;
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if (alpha) {
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if (gray) {
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COLOR_SET_RGB(c, buffer[0], buffer[0], buffer[0]);
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COLOR_SET_ALPHA(c, buffer[1]);
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} else {
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le_read(c, buffer);
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}
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} else {
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COLOR_SET_ALPHA(c, 0xff);
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if (gray) {
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COLOR_SET_RGB(c, buffer[0], buffer[0], buffer[0]);
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} else {
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COLOR_SET_RGB(c, buffer[0], buffer[1], buffer[2]);
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}
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}
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return c;
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}
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hvif_status
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read_color_style(hvif_style* style, char* buffer, bool gray, bool alpha)
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{
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hvif_color color = read_color(buffer, gray, alpha);
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style->colors = calloc(1, sizeof(hvif_color));
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style->offsets = calloc(1, sizeof(float));
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if (!style->colors || !style->colors) return ERROR_NOMEM;
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style->colors[0] = color;
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style->offsets[0] = 1.0; /* TODO: Is this ok for solid colors */
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return SUCCESS;
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}
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hvif_status
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read_style(FILE* file, hvif_style* style)
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{
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uint8_t type;
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if (fread(&type, 1, 1, file) != 1) { return ERROR_STYLE; }
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char buffer[4];
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switch (type) {
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case STYLE_TYPE_SOLID_COLOR:
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if (fread(buffer, 1, 4, file) != 4) { return ERROR_EOF; }
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read_color_style(style, buffer, false, true);
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break;
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case STYLE_TYPE_GRADIENT: break;
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case STYLE_TYPE_SOLID_COLOR_NO_ALPHA:
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if (fread(buffer, 1, 3, file) != 3) { return ERROR_EOF; }
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read_color_style(style, buffer, false, false);
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break;
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case STYLE_TYPE_SOLID_GRAY:
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if (fread(buffer, 1, 2, file) != 2) { return ERROR_EOF; }
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read_color_style(style, buffer, true, true);
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break;
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case STYLE_TYPE_SOLID_GRAY_NO_ALPHA:
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if (fread(buffer, 1, 1, file) != 1) { return ERROR_EOF; }
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read_color_style(style, buffer, true, false);
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break;
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default: return ERROR_STYLE;
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}
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return SUCCESS;
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}
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hvif_result
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hvif_from_file(FILE* file)
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{
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uint32_t const magic = 0x6669636e; /* 'finc' (on disk little endian 'cnif') */
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char magic_buffer[4];
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if (fread(magic_buffer, 1, 4, file) != 4) { return ERROR_RESULT(ERROR_EOF); }
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uint32_t read_magic;
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le_read(read_magic, magic_buffer);
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if (read_magic != magic) { return ERROR_RESULT(ERROR_MAGIC); }
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hvif_image* image = calloc(1, sizeof(hvif_image));
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if (!image) return ERROR_RESULT(ERROR_NOMEM);
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uint8_t num_styles;
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if (fread(&num_styles, 1, 1, file) != 1) {
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hvif_free(image);
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return ERROR_RESULT(ERROR_EOF);
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}
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image->styles = calloc(num_styles, sizeof(hvif_style));
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if (!image->styles) {
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hvif_free(image);
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return ERROR_RESULT(ERROR_NOMEM);
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}
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for (unsigned i = 0; i < image->num_styles; ++i) {
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hvif_status s = read_style(file, &image->styles[i]);
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if (s != SUCCESS) {
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hvif_free(image);
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return ERROR_RESULT(s);
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}
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}
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return SUCCESS_RESULT(image);
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}
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void
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hvif_free(hvif_image* image)
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{
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for (unsigned i = 0; i < image->num_styles; ++i) {
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free(image->styles[i].colors);
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free(image->styles[i].offsets);
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}
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free(image->styles);
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free(image);
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}
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