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move MIN/MAX_HISTO_BITS to format_constants.h

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(under the name MAX_HUFFMAN_BITS, since the specs read:
	int huffman_bits = ReadBits(3) + 2;
)

Change-Id: Ifc66576bbd8e48518d3d78a3f515f851cf1883dc
This commit is contained in:
Pascal Massimino 2012-07-16 19:11:54 -07:00
parent 8130c4cc64
commit 2a3ab6f925
2 changed files with 7 additions and 5 deletions
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9
src/enc/vp8l.c
View File

@ -28,8 +28,6 @@ extern "C" {
#define PALETTE_KEY_RIGHT_SHIFT 22 // Key for 1K buffer.
#define MAX_HUFF_IMAGE_SIZE (16 * 1024 * 1024)
#define MIN_HISTO_BITS 2
#define MAX_HISTO_BITS 9
// -----------------------------------------------------------------------------
// Palette
@ -517,7 +515,8 @@ static int EncodeImageInternal(VP8LBitWriter* const bw,
VP8LBackwardRefs refs;
uint16_t* const histogram_symbols =
(uint16_t*)malloc(histogram_image_xysize * sizeof(*histogram_symbols));
assert(histogram_bits >= MIN_HISTO_BITS && histogram_bits <= MAX_HISTO_BITS);
assert(histogram_bits >= MIN_HUFFMAN_BITS);
assert(histogram_bits <= MAX_HUFFMAN_BITS);
if (histogram_image == NULL || histogram_symbols == NULL) goto Error;
// Calculate backward references from ARGB image.
@ -894,8 +893,8 @@ static int GetHistoBits(const WebPConfig* const config,
if (huff_image_size <= MAX_HUFF_IMAGE_SIZE) break;
++histo_bits;
}
return (histo_bits < MIN_HISTO_BITS) ? MIN_HISTO_BITS :
(histo_bits > MAX_HISTO_BITS) ? MAX_HISTO_BITS : histo_bits;
return (histo_bits < MIN_HUFFMAN_BITS) ? MIN_HUFFMAN_BITS :
(histo_bits > MAX_HUFFMAN_BITS) ? MAX_HUFFMAN_BITS : histo_bits;
}
static void InitEncParams(VP8LEncoder* const enc) {

3
src/webp/format_constants.h
View File

@ -40,6 +40,9 @@
#define NUM_DISTANCE_CODES 40
#define CODE_LENGTH_CODES 19
#define MIN_HUFFMAN_BITS 2 // min number of Huffman bits
#define MAX_HUFFMAN_BITS 9 // max number of Huffman bits
#define TRANSFORM_PRESENT 1 // The bit to be written when next data
// to be read is a transform.
#define NUM_TRANSFORMS 4 // Maximum number of allowed transform