Split image output functions into separate files.

1 files changed, 87 insertions, 0 deletions

diff --git a/source/fitz/output-tga.c b/source/fitz/output-tga.c
new file mode 100644
index 00000000..3e1112b4
--- /dev/null
+++ b/source/fitz/output-tga.c
@@ -0,0 +1,87 @@
+#include "mupdf/fitz.h"
+
+/*
+ * Write pixmap to TGA file (with or without alpha channel)
+ */
+
+static inline void tga_put_pixel(fz_context *ctx, fz_output *out, unsigned char *data, int n, int is_bgr)
+{
+	if (n >= 3 && !is_bgr)
+	{
+		fz_putc(ctx, out, data[2]);
+		fz_putc(ctx, out, data[1]);
+		fz_putc(ctx, out, data[0]);
+		if (n == 4)
+			fz_putc(ctx, out, data[3]);
+		return;
+	}
+	if (n == 2)
+	{
+		fz_putc(ctx, out, data[0]);
+		fz_putc(ctx, out, data[0]);
+	}
+	fz_write(ctx, out, data, n);
+}
+
+void
+fz_save_pixmap_as_tga(fz_context *ctx, fz_pixmap *pixmap, const char *filename, int savealpha)
+{
+	fz_output *out = fz_new_output_with_path(ctx, filename, 0);
+	fz_try(ctx)
+		fz_write_pixmap_as_tga(ctx, out, pixmap, savealpha);
+	fz_always(ctx)
+		fz_drop_output(ctx, out);
+	fz_catch(ctx)
+		fz_rethrow(ctx);
+}
+
+void
+fz_write_pixmap_as_tga(fz_context *ctx, fz_output *out, fz_pixmap *pixmap, int savealpha)
+{
+	unsigned char head[18];
+	int n = pixmap->n;
+	int d = savealpha || n == 1 ? n : n - 1;
+	int is_bgr = pixmap->colorspace == fz_device_bgr(ctx);
+	int k;
+
+	if (pixmap->colorspace && pixmap->colorspace != fz_device_gray(ctx) &&
+		pixmap->colorspace != fz_device_rgb(ctx) && pixmap->colorspace != fz_device_bgr(ctx))
+	{
+		fz_throw(ctx, FZ_ERROR_GENERIC, "pixmap must be grayscale or rgb to write as tga");
+	}
+
+	memset(head, 0, sizeof(head));
+	head[2] = n == 4 ? 10 : 11;
+	head[12] = pixmap->w & 0xFF; head[13] = (pixmap->w >> 8) & 0xFF;
+	head[14] = pixmap->h & 0xFF; head[15] = (pixmap->h >> 8) & 0xFF;
+	head[16] = d * 8;
+	head[17] = savealpha && n > 1 ? 8 : 0;
+	if (savealpha && d == 2)
+		head[16] = 32;
+
+	fz_write(ctx, out, head, sizeof(head));
+	for (k = 1; k <= pixmap->h; k++)
+	{
+		int i, j;
+		unsigned char *line = pixmap->samples + pixmap->w * n * (pixmap->h - k);
+		for (i = 0, j = 1; i < pixmap->w; i += j, j = 1)
+		{
+			for (; i + j < pixmap->w && j < 128 && !memcmp(line + i * n, line + (i + j) * n, d); j++);
+			if (j > 1)
+			{
+				fz_putc(ctx, out, j - 1 + 128);
+				tga_put_pixel(ctx, out, line + i * n, d, is_bgr);
+			}
+			else
+			{
+				for (; i + j < pixmap->w && j <= 128 && memcmp(line + (i + j - 1) * n, line + (i + j) * n, d) != 0; j++);
+				if (i + j < pixmap->w || j > 128)
+					j--;
+				fz_putc(ctx, out, j - 1);
+				for (; j > 0; j--, i++)
+					tga_put_pixel(ctx, out, line + i * n, d, is_bgr);
+			}
+		}
+	}
+	fz_write(ctx, out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.\0", 26);
+}