Allow conversion to hdr formats
Add conversion functions that produce GDK_MEMORY_R32G32B32A32_PREMULTIPLIED data, since we want to allow downloading textures in that format. We make use of the new chaining abilities here to cut down on the number of conversion functions.
This commit is contained in:
Matthias Clasen
@@ -591,11 +591,177 @@ static ConversionFunc converters_to_rgba[GDK_MEMORY_N_FORMATS] =
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convert_float_swizzle_3012
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};
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static void
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convert_rgba_to_hdr (guchar *dest_data,
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gsize dest_stride,
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GdkMemoryFormat dest_format,
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const guchar *src_data,
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gsize src_stride,
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GdkMemoryFormat src_format,
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gsize width,
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gsize height)
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{
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gsize x, y;
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for (y = 0; y < height; y++)
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{
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guint16 *src = (guint16 *)src_data;
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float *dest = (float *)dest_data;
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for (x = 0; x < width; x++)
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{
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dest[4 * (y * width + x) + 0] = src[3 * (y * width + x) + 0] / 255.f;
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dest[4 * (y * width + x) + 1] = src[3 * (y * width + x) + 1] / 255.f;
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dest[4 * (y * width + x) + 2] = src[3 * (y * width + x) + 2] / 255.f;
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dest[4 * (y * width + x) + 3] = src[3 * (y * width + x) + 3] / 255.f;
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}
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dest_data += dest_stride;
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src_data += src_stride;
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}
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}
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static void
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convert_8bit_to_hdr (guchar *dest_data,
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gsize dest_stride,
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GdkMemoryFormat dest_format,
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const guchar *src_data,
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gsize src_stride,
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GdkMemoryFormat src_format,
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gsize width,
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gsize height)
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{
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guchar *data;
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/* TODO: this could perhaps be done in-place */
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data = g_malloc (width * height * 4);
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gdk_memory_convert (data, 4 * width, GDK_MEMORY_R8G8B8A8_PREMULTIPLIED,
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src_data, src_stride, src_format,
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width, height);
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convert_rgba_to_hdr (dest_data, dest_stride, dest_format,
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data, 4 * width, GDK_MEMORY_R8G8B8A8_PREMULTIPLIED,
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width, height);
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g_free (data);
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}
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static void
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convert_16bit_to_hdr (guchar *dest_data,
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gsize dest_stride,
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GdkMemoryFormat dest_format,
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const guchar *src_data,
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gsize src_stride,
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GdkMemoryFormat src_format,
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gsize width,
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gsize height)
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{
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gsize x, y;
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for (y = 0; y < height; y++)
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{
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guint16 *src = (guint16 *)src_data;
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float *dest = (float *)dest_data;
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for (x = 0; x < width; x++)
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{
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dest[4 * (y * width + x) + 0] = src[3 * (y * width + x) + 0] / 65535.f;
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dest[4 * (y * width + x) + 1] = src[3 * (y * width + x) + 1] / 65535.f;
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dest[4 * (y * width + x) + 2] = src[3 * (y * width + x) + 2] / 65535.f;
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dest[4 * (y * width + x) + 3] = src[3 * (y * width + x) + 3] / 65535.f;
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}
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dest_data += dest_stride;
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src_data += src_stride;
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}
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}
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static void
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convert_fp16_to_hdr (guchar *dest_data,
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gsize dest_stride,
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GdkMemoryFormat dest_format,
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const guchar *src_data,
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gsize src_stride,
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GdkMemoryFormat src_format,
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gsize width,
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gsize height)
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{
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gsize x, y;
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int src_bpp;
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if (src_format == GDK_MEMORY_R16G16B16A16_FLOAT_PREMULTIPLIED)
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src_bpp = 4;
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else
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src_bpp = 3;
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for (y = 0; y < height; y++)
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{
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guint16 *src = (guint16 *)src_data;
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float *dest = (float *)dest_data;
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for (x = 0; x < width; x++)
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{
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guint16 h[4];
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h[0] = src[src_bpp * (y * width + x)];
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h[1] = src[src_bpp * (y * width + x) + 1];
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h[2] = src[src_bpp * (y * width + x) + 2];
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if (src_bpp == 4)
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h[3] = src[src_bpp * (y * width + x) + 3];
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else
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h[3] = FP16_ONE;
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half_to_float4 (h, &dest[4 * (y * width + x)]);
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}
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dest_data += dest_stride;
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src_data += src_stride;
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}
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}
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static void
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convert_float_to_hdr (guchar *dest_data,
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gsize dest_stride,
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GdkMemoryFormat dest_format,
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const guchar *src_data,
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gsize src_stride,
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GdkMemoryFormat src_format,
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gsize width,
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gsize height)
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{
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gsize x, y;
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for (y = 0; y < height; y++)
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{
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float *src = (float *)src_data;
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float *dest = (float *)dest_data;
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for (x = 0; x < width; x++)
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{
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dest[4 * (y * width + x) + 0] = src[3 * (y * width + x) + 0];
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dest[4 * (y * width + x) + 1] = src[3 * (y * width + x) + 1];
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dest[4 * (y * width + x) + 2] = src[3 * (y * width + x) + 2];
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dest[4 * (y * width + x) + 3] = 1.0;
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}
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dest_data += dest_stride;
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src_data += src_stride;
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}
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}
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static ConversionFunc converters_to_hdr[GDK_MEMORY_N_FORMATS] =
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{
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convert_8bit_to_hdr,
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convert_8bit_to_hdr,
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convert_rgba_to_hdr,
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convert_8bit_to_hdr,
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convert_8bit_to_hdr,
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convert_8bit_to_hdr,
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convert_8bit_to_hdr,
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convert_8bit_to_hdr,
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convert_8bit_to_hdr,
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convert_16bit_to_hdr,
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convert_fp16_to_hdr,
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convert_fp16_to_hdr,
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convert_float_to_hdr,
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convert_memcpy
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};
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static ConversionFunc* converters[GDK_MEMORY_N_FORMATS] = {
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converters_to_bgra, converters_to_argb, converters_to_rgba,
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NULL, NULL, NULL, NULL, NULL, NULL,
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NULL, NULL, NULL, NULL,
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NULL
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converters_to_hdr
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};
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void
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