annotate mupdf-source/docs/reference/c/fitz/pixmap.md @ 2:b50eed0cc0ef upstream

ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 # Pixmaps
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3 A pixmap is an 8-bit per component raster image. Each pixel is packed with
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4 process colorants, spot colors, and alpha channel in that order. If an alpha
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5 channel is present, the process colorants are pre-multiplied with the alpha
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6 value.
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8 typedef struct {
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9 int w, h; // Width and height
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10 int x, y; // X and Y offset
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11 int n; // Number of components in total (colors + spots + alpha)
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12 int s; // Number of components that are spot colors
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13 int alpha; // True if alpha channel is present
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14 int stride; // Number of bytes per row
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15 int xres, yres; // Resolution in dots per inch.
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16 fz_colorspace *colorspace; // Colorspace of samples, or NULL if alpha only pixmap.
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17 unsigned char *samples;
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18 private internal fields
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19 } fz_pixmap;
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21 fz_pixmap *fz_keep_pixmap(fz_context *ctx, fz_pixmap *pix);
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22 void fz_drop_pixmap(fz_context *ctx, fz_pixmap *pix);
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24 There are too many pixmap constructors. Here is the only one you should need.
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26 fz_pixmap *fz_new_pixmap(fz_context *ctx, fz_colorspace *cs, int w, int h, fz_separations *seps, int alpha);
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29 A newly created pixmap has uninitialized data. The samples must either be
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30 cleared or overwritten with existing data before the pixmap can be safely used.
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32 `void fz_clear_pixmap(fz_context *ctx, fz_pixmap *pix);`
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33 : Clear the pixmap to black.
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35 `void fz_clear_pixmap_with_value(fz_context *ctx, fz_pixmap *pix, int value);`
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36 : Clear the pixmap to a grayscale value `0..255`, where `0` is black and
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37 `255` is white. The value is automatically inverted for subtractive
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38 colorspaces.
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40 `void fz_fill_pixmap_with_color(fz_context *ctx, fz_pixmap *pix, fz_colorspace *colorspace, float *color, fz_color_params color_params);`
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41 : Fill the pixmap with a solid color.
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43 `void fz_unpack_tile(fz_context *ctx, fz_pixmap *dst, unsigned char *src, int n, int depth, size_t stride, int scale);`
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44 : Unpack pixel values from source data to fill in the pixmap samples. `n`
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45 is the number of samples per pixel, `depth` is the bit depth (`1`, `2`,
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46 `4`, `8`, `16`, `24`, or `32`), `stride` is the number of bytes per
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47 row. If `scale` is non-zero, it is the scaling factor to apply to the
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48 input samples to map them to the 8-bpc pixmap range. Pass `1` to the
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49 scale for indexed images, and `0` for everything else. If there are
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50 more components in the source data than the destination, they will be
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51 dropped. If there are fewer components in the source data, the pixmap
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52 will be padded with `255`.
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56 Some functions can create a pixmap and initialize its samples in one go:
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58 .. code-block:: c
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60 fz_pixmap *fz_new_pixmap_from_8bpp_data(fz_context *ctx, int x, int y, int w, int h, unsigned char *data, int stride);
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61 fz_pixmap *fz_new_pixmap_from_1bpp_data(fz_context *ctx, int x, int y, int w, int h, unsigned char *data, int stride);
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64 Pixmaps can be tinted, inverted, scaled, gamma corrected, and converted to other colorspaces.
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68 `void fz_invert_pixmap(fz_context *ctx, fz_pixmap *pix);`
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69 : Invert the pixmap samples.
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71 `void fz_tint_pixmap(fz_context *ctx, fz_pixmap *pix, int black, int white);`
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72 : Map black to black and white to white. The black and white colors are
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73 represented as a packed RGB integer. `0xFFFFFF` is white, `0xFF0000` is
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74 red, and `0x000000` is black.
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76 `void fz_gamma_pixmap(fz_context *ctx, fz_pixmap *pix, float gamma);`
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77 : Apply a gamma correction curve on the samples. A typical use is to
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78 adjust the gamma curve on an inverted image by applying a correction
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79 factor of 1/1.4.
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81 `fz_pixmap *fz_convert_pixmap(fz_context *ctx, fz_pixmap *source_pixmap, fz_colorspace *destination_colorspace, fz_colorspace *proof_colorspace, fz_default_colorspaces *default_cs, fz_color_params color_params, int keep_alpha);`
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82 : Convert the source pixmap into the destination colorspace. Pass `NULL`
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83 for the `default_cs` parameter.
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85 `fz_pixmap *fz_scale_pixmap(fz_context *ctx, fz_pixmap *src, float x, float y, float w, float h, const fz_irect *clip);`
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86 : Scale the pixmap up or down in size to fit the rectangle. Will return
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87 `NULL` if the scaling factors are out of range. This applies fancy
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88 filtering and will anti-alias the edges for subpixel positioning if
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89 using non-integer coordinates. If the clip rectangle is set, the
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90 returned pixmap may be subset to fit the clip rectangle. Pass `NULL` to
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91 the clip if you want the whole pixmap scaled.