FreeRDP/rdtk/librdtk/rdtk_nine_patch.c

/**
 * RdTk: Remote Desktop Toolkit
 *
 * Copyright 2014 Marc-Andre Moreau <marcandre.moreau@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <rdtk/config.h>

#include "rdtk_resources.h"

#include "rdtk_nine_patch.h"

static int rdtk_image_copy_alpha_blend(uint8_t* pDstData, int nDstStep, int nXDst, int nYDst,
                                       int nWidth, int nHeight, uint8_t* pSrcData, int nSrcStep,
                                       int nXSrc, int nYSrc)
{
	int x, y;
	uint8_t A, R, G, B;

	for (y = 0; y < nHeight; y++)
	{
		const uint8_t* pSrcPixel = &pSrcData[((nYSrc + y) * nSrcStep) + (nXSrc * 4)];
		uint8_t* pDstPixel = &pDstData[((nYDst + y) * nDstStep) + (nXDst * 4)];

		for (x = 0; x < nWidth; x++)
		{
			B = pSrcPixel[0];
			G = pSrcPixel[1];
			R = pSrcPixel[2];
			A = pSrcPixel[3];
			pSrcPixel += 4;

			if (A == 255)
			{
				pDstPixel[0] = B;
				pDstPixel[1] = G;
				pDstPixel[2] = R;
			}
			else
			{
				R = (R * A) / 255;
				G = (G * A) / 255;
				B = (B * A) / 255;
				pDstPixel[0] = B + (pDstPixel[0] * (255 - A) + (255 / 2)) / 255;
				pDstPixel[1] = G + (pDstPixel[1] * (255 - A) + (255 / 2)) / 255;
				pDstPixel[2] = R + (pDstPixel[2] * (255 - A) + (255 / 2)) / 255;
			}

			pDstPixel[3] = 0xFF;
			pDstPixel += 4;
		}
	}

	return 1;
}

int rdtk_nine_patch_draw(rdtkSurface* surface, int nXDst, int nYDst, int nWidth, int nHeight,
                         rdtkNinePatch* ninePatch)
{
	int x, y;
	int width;
	int height;
	int nXSrc;
	int nYSrc;
	int nSrcStep;
	int nDstStep;
	uint8_t* pSrcData;
	uint8_t* pDstData;
	int scaleWidth;

	if (nWidth < ninePatch->width)
		nWidth = ninePatch->width;

	if (nHeight < ninePatch->height)
		nHeight = ninePatch->height;

	WINPR_UNUSED(nHeight);

	scaleWidth = nWidth - (ninePatch->width - ninePatch->scaleWidth);
	nSrcStep = ninePatch->scanline;
	pSrcData = ninePatch->data;
	pDstData = surface->data;
	nDstStep = surface->scanline;
	/* top */
	x = 0;
	y = 0;
	/* top left */
	nXSrc = 0;
	nYSrc = 0;
	width = ninePatch->scaleLeft;
	height = ninePatch->scaleTop;
	rdtk_image_copy_alpha_blend(pDstData, nDstStep, nXDst + x, nYDst + y, width, height, pSrcData,
	                            nSrcStep, nXSrc, nYSrc);
	x += width;
	/* top middle (scalable) */
	nXSrc = ninePatch->scaleLeft;
	nYSrc = 0;
	height = ninePatch->scaleTop;

	while (x < (nXSrc + scaleWidth))
	{
		width = (nXSrc + scaleWidth) - x;

		if (width > ninePatch->scaleWidth)
			width = ninePatch->scaleWidth;

		rdtk_image_copy_alpha_blend(pDstData, nDstStep, nXDst + x, nYDst + y, width, height,
		                            pSrcData, nSrcStep, nXSrc, nYSrc);
		x += width;
	}

	/* top right */
	nXSrc = ninePatch->scaleRight;
	nYSrc = 0;
	width = ninePatch->width - ninePatch->scaleRight;
	height = ninePatch->scaleTop;
	rdtk_image_copy_alpha_blend(pDstData, nDstStep, nXDst + x, nYDst + y, width, height, pSrcData,
	                            nSrcStep, nXSrc, nYSrc);
	/* middle */
	x = 0;
	y = ninePatch->scaleTop;
	/* middle left */
	nXSrc = 0;
	nYSrc = ninePatch->scaleTop;
	width = ninePatch->scaleLeft;
	height = ninePatch->scaleHeight;
	rdtk_image_copy_alpha_blend(pDstData, nDstStep, nXDst + x, nYDst + y, width, height, pSrcData,
	                            nSrcStep, nXSrc, nYSrc);
	x += width;
	/* middle (scalable) */
	nXSrc = ninePatch->scaleLeft;
	nYSrc = ninePatch->scaleTop;
	height = ninePatch->scaleHeight;

	while (x < (nXSrc + scaleWidth))
	{
		width = (nXSrc + scaleWidth) - x;

		if (width > ninePatch->scaleWidth)
			width = ninePatch->scaleWidth;

		rdtk_image_copy_alpha_blend(pDstData, nDstStep, nXDst + x, nYDst + y, width, height,
		                            pSrcData, nSrcStep, nXSrc, nYSrc);
		x += width;
	}

	/* middle right */
	nXSrc = ninePatch->scaleRight;
	nYSrc = ninePatch->scaleTop;
	width = ninePatch->width - ninePatch->scaleRight;
	height = ninePatch->scaleHeight;
	rdtk_image_copy_alpha_blend(pDstData, nDstStep, nXDst + x, nYDst + y, width, height, pSrcData,
	                            nSrcStep, nXSrc, nYSrc);
	/* bottom */
	x = 0;
	y = ninePatch->scaleBottom;
	/* bottom left */
	nXSrc = 0;
	nYSrc = ninePatch->scaleBottom;
	width = ninePatch->scaleLeft;
	height = ninePatch->height - ninePatch->scaleBottom;
	rdtk_image_copy_alpha_blend(pDstData, nDstStep, nXDst + x, nYDst + y, width, height, pSrcData,
	                            nSrcStep, nXSrc, nYSrc);
	x += width;
	/* bottom middle (scalable) */
	nXSrc = ninePatch->scaleLeft;
	nYSrc = ninePatch->scaleBottom;
	height = ninePatch->height - ninePatch->scaleBottom;

	while (x < (nXSrc + scaleWidth))
	{
		width = (nXSrc + scaleWidth) - x;

		if (width > ninePatch->scaleWidth)
			width = ninePatch->scaleWidth;

		rdtk_image_copy_alpha_blend(pDstData, nDstStep, nXDst + x, nYDst + y, width, height,
		                            pSrcData, nSrcStep, nXSrc, nYSrc);
		x += width;
	}

	/* bottom right */
	nXSrc = ninePatch->scaleRight;
	nYSrc = ninePatch->scaleBottom;
	width = ninePatch->width - ninePatch->scaleRight;
	height = ninePatch->height - ninePatch->scaleBottom;
	rdtk_image_copy_alpha_blend(pDstData, nDstStep, nXDst + x, nYDst + y, width, height, pSrcData,
	                            nSrcStep, nXSrc, nYSrc);
	return 1;
}

int rdtk_nine_patch_set_image(rdtkNinePatch* ninePatch, wImage* image)
{
	int x, y;
	uint8_t* data;
	int beg, end;
	int scanline;
	uint32_t* pixel;
	int width, height;
	ninePatch->image = image;
	width = image->width;
	height = image->height;
	scanline = image->scanline;
	data = image->data;
	/* parse scalable area */
	beg = end = -1;
	pixel = (uint32_t*)&data[4]; /* (1, 0) */

	for (x = 1; x < width - 1; x++)
	{
		if (beg < 0)
		{
			if (*pixel)
			{
				beg = x;
			}
		}
		else if (end < 0)
		{
			if (!(*pixel))
			{
				end = x;
				break;
			}
		}

		pixel++;
	}

	ninePatch->scaleLeft = beg - 1;
	ninePatch->scaleRight = end - 1;
	ninePatch->scaleWidth = ninePatch->scaleRight - ninePatch->scaleLeft;
	beg = end = -1;
	pixel = (uint32_t*)&data[scanline]; /* (0, 1) */

	for (y = 1; y < height - 1; y++)
	{
		if (beg < 0)
		{
			if (*pixel)
			{
				beg = y;
			}
		}
		else if (end < 0)
		{
			if (!(*pixel))
			{
				end = y;
				break;
			}
		}

		pixel = (uint32_t*)&((uint8_t*)pixel)[scanline];
	}

	ninePatch->scaleTop = beg - 1;
	ninePatch->scaleBottom = end - 1;
	ninePatch->scaleHeight = ninePatch->scaleBottom - ninePatch->scaleTop;
	/* parse fillable area */
	beg = end = -1;
	pixel = (uint32_t*)&data[((height - 1) * scanline) + 4]; /* (1, height - 1) */

	for (x = 1; x < width - 1; x++)
	{
		if (beg < 0)
		{
			if (*pixel)
			{
				beg = x;
			}
		}
		else if (end < 0)
		{
			if (!(*pixel))
			{
				end = x;
				break;
			}
		}

		pixel++;
	}

	ninePatch->fillLeft = beg - 1;
	ninePatch->fillRight = end - 1;
	ninePatch->fillWidth = ninePatch->fillRight - ninePatch->fillLeft;
	beg = end = -1;
	pixel = (uint32_t*)&data[((width - 1) * 4) + scanline]; /* (width - 1, 1) */

	for (y = 1; y < height - 1; y++)
	{
		if (beg < 0)
		{
			if (*pixel)
			{
				beg = y;
			}
		}
		else if (end < 0)
		{
			if (!(*pixel))
			{
				end = y;
				break;
			}
		}

		pixel = (uint32_t*)&((uint8_t*)pixel)[scanline];
	}

	ninePatch->fillTop = beg - 1;
	ninePatch->fillBottom = end - 1;
	ninePatch->fillHeight = ninePatch->fillBottom - ninePatch->fillTop;
	/* cut out borders from image */
	ninePatch->width = width - 2;
	ninePatch->height = height - 2;
	ninePatch->data = &data[scanline + 4]; /* (1, 1) */
	ninePatch->scanline = scanline;
#if 0
	printf("width: %d height: %d\n", ninePatch->width, ninePatch->height);
	printf("scale: left: %d right: %d top: %d bottom: %d\n",
	       ninePatch->scaleLeft, ninePatch->scaleRight,
	       ninePatch->scaleTop, ninePatch->scaleBottom);
	printf("fill:  left: %d right: %d top: %d bottom: %d\n",
	       ninePatch->fillLeft, ninePatch->fillRight,
	       ninePatch->fillTop, ninePatch->fillBottom);
#endif
	return 1;
}

rdtkNinePatch* rdtk_nine_patch_new(rdtkEngine* engine)
{
	rdtkNinePatch* ninePatch;
	ninePatch = (rdtkNinePatch*)calloc(1, sizeof(rdtkNinePatch));

	if (!ninePatch)
		return NULL;

	ninePatch->engine = engine;
	return ninePatch;
}

void rdtk_nine_patch_free(rdtkNinePatch* ninePatch)
{
	if (!ninePatch)
		return;

	winpr_image_free(ninePatch->image, TRUE);
	free(ninePatch);
}

int rdtk_nine_patch_engine_init(rdtkEngine* engine)
{
	int status;
	wImage* image = NULL;
	rdtkNinePatch* ninePatch;

	if (!engine->button9patch)
	{
		SSIZE_T size;
		const uint8_t* data;
		status = -1;
		size = rdtk_get_embedded_resource_file("btn_default_normal.9.png", &data);

		if (size > 0)
		{
			image = winpr_image_new();

			if (image)
				status = winpr_image_read_buffer(image, data, (size_t)size);
		}

		if (status > 0)
		{
			ninePatch = engine->button9patch = rdtk_nine_patch_new(engine);

			if (ninePatch)
				rdtk_nine_patch_set_image(ninePatch, image);
			else
				winpr_image_free(image, TRUE);
		}
		else
			winpr_image_free(image, TRUE);
	}

	if (!engine->textField9patch)
	{
		SSIZE_T size;
		const uint8_t* data;
		status = -1;
		size = rdtk_get_embedded_resource_file("textfield_default.9.png", &data);
		image = NULL;

		if (size > 0)
		{
			image = winpr_image_new();

			if (image)
				status = winpr_image_read_buffer(image, data, (size_t)size);
		}

		if (status > 0)
		{
			ninePatch = engine->textField9patch = rdtk_nine_patch_new(engine);

			if (ninePatch)
				rdtk_nine_patch_set_image(ninePatch, image);
			else
				winpr_image_free(image, TRUE);
		}
		else
			winpr_image_free(image, TRUE);
	}

	return 1;
}

int rdtk_nine_patch_engine_uninit(rdtkEngine* engine)
{
	if (engine->button9patch)
	{
		rdtk_nine_patch_free(engine->button9patch);
		engine->button9patch = NULL;
	}

	if (engine->textField9patch)
	{
		rdtk_nine_patch_free(engine->textField9patch);
		engine->textField9patch = NULL;
	}

	return 1;
}