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path: root/src/wld/pixman.c
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/* wld: pixman.c
 *
 * Copyright (c) 2013, 2014 Michael Forney
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "wld/pixman.h"
#include "wld/wld-private.h"

#define PIXMAN_COLOR(c)                                                        \
  {                                                                            \
    .alpha = ((c >> 24) & 0xff) * 0x101, .red = ((c >> 16) & 0xff) * 0x101,    \
    .green = ((c >> 8) & 0xff) * 0x101, .blue = ((c >> 0) & 0xff) * 0x101,     \
  }

struct pixman_renderer {
  struct wld_renderer base;
  pixman_image_t *target;
  pixman_glyph_cache_t *glyph_cache;
};

struct pixman_buffer {
  struct buffer base;
  pixman_image_t *image;
};

struct pixman_map {
  struct wld_exporter exporter;
  struct wld_destructor destructor;
  pixman_image_t *image;
};

#include "interface/context.h"
#define RENDERER_IMPLEMENTS_REGION
#include "interface/buffer.h"
#include "interface/renderer.h"
IMPL(pixman_renderer, wld_renderer)
IMPL(pixman_buffer, wld_buffer)

static struct wld_context context = {.impl = &wld_context_impl};

EXPORT
struct wld_context *wld_pixman_context = &context;

struct wld_renderer *context_create_renderer(struct wld_context *context) {
  struct pixman_renderer *renderer;

  if (!(renderer = malloc(sizeof *renderer)))
    goto error0;

  if (!(renderer->glyph_cache = pixman_glyph_cache_create()))
    goto error1;

  renderer_initialize(&renderer->base, &wld_renderer_impl);
  renderer->target = NULL;

  return &renderer->base;

error1:
  free(renderer);
error0:
  return NULL;
}

static struct buffer *new_buffer(pixman_image_t *image) {
  struct pixman_buffer *buffer;

  if (!(buffer = malloc(sizeof *buffer)))
    return NULL;

  buffer_initialize(&buffer->base, &wld_buffer_impl,
                    pixman_image_get_width(image),
                    pixman_image_get_height(image),
                    format_pixman_to_wld(pixman_image_get_format(image)),
                    pixman_image_get_stride(image));
  buffer->base.base.map = pixman_image_get_data(image);
  buffer->image = image;

  return &buffer->base;
}

struct buffer *context_create_buffer(struct wld_context *context,
                                     uint32_t width, uint32_t height,
                                     uint32_t format, uint32_t flags) {
  struct buffer *buffer;
  pixman_image_t *image;

  image = pixman_image_create_bits(format_wld_to_pixman(format), width, height,
                                   NULL, 0);

  if (!image)
    goto error0;

  if (!(buffer = new_buffer(image)))
    goto error1;

  return buffer;

error1:
  pixman_image_unref(image);
error0:
  return NULL;
}

struct buffer *context_import_buffer(struct wld_context *context, uint32_t type,
                                     union wld_object object, uint32_t width,
                                     uint32_t height, uint32_t format,
                                     uint32_t pitch) {
  struct buffer *buffer;
  pixman_image_t *image;

  switch (type) {
  case WLD_OBJECT_DATA:
    image = pixman_image_create_bits(format_wld_to_pixman(format), width,
                                     height, object.ptr, pitch);
    break;
  default:
    image = NULL;
  }

  if (!image)
    goto error0;

  if (!(buffer = new_buffer(image)))
    goto error1;

  return buffer;

error1:
  pixman_image_unref(image);
error0:
  return NULL;
}

void context_destroy(struct wld_context *context) {}

uint32_t renderer_capabilities(struct wld_renderer *renderer,
                               struct buffer *buffer) {
  /* The pixman renderer can read and write to any buffer using it's map
   * implementation. */
  return WLD_CAPABILITY_READ | WLD_CAPABILITY_WRITE;
}

static void destroy_image(pixman_image_t *image, void *data) {
  struct buffer *buffer = data;

  wld_unmap(&buffer->base);
}

bool map_export(struct wld_exporter *exporter, struct wld_buffer *buffer,
                uint32_t type, union wld_object *object) {
  struct pixman_map *map = CONTAINER_OF(exporter, struct pixman_map, exporter);

  switch (type) {
  case WLD_PIXMAN_OBJECT_IMAGE:
    object->ptr = pixman_image_ref(map->image);
    return true;
  default:
    return false;
  }
}

void map_destroy(struct wld_destructor *destructor) {
  struct pixman_map *map =
      CONTAINER_OF(destructor, struct pixman_map, destructor);

  pixman_image_unref(map->image);
  free(map);
}

static pixman_image_t *pixman_image(struct buffer *buffer) {
  if (buffer->base.impl == &wld_buffer_impl)
    return pixman_image_ref(pixman_buffer(&buffer->base)->image);

  union wld_object object;

  if (wld_export(&buffer->base, WLD_PIXMAN_OBJECT_IMAGE, &object))
    return object.ptr;

  struct pixman_map *map;
  pixman_image_t *image;

  if (!wld_map(&buffer->base))
    goto error0;

  image = pixman_image_create_bits(format_wld_to_pixman(buffer->base.format),
                                   buffer->base.width, buffer->base.height,
                                   buffer->base.map, buffer->base.pitch);

  if (!image)
    goto error1;

  if (!(map = malloc(sizeof *map)))
    goto error2;

  map->image = image;
  map->exporter.export = &map_export;
  wld_buffer_add_exporter(&buffer->base, &map->exporter);
  map->destructor.destroy = &map_destroy;
  wld_buffer_add_destructor(&buffer->base, &map->destructor);
  pixman_image_set_destroy_function(image, &destroy_image, buffer);

  return pixman_image_ref(image);

error2:
  pixman_image_unref(image);
error1:
  wld_unmap(&buffer->base);
error0:
  return NULL;
}

bool renderer_set_target(struct wld_renderer *base, struct buffer *buffer) {
  struct pixman_renderer *renderer = pixman_renderer(base);

  if (renderer->target)
    pixman_image_unref(renderer->target);

  if (buffer)
    return (renderer->target = pixman_image(buffer));

  renderer->target = NULL;
  return true;
}

void renderer_fill_rectangle(struct wld_renderer *base, uint32_t color,
                             int32_t x, int32_t y, uint32_t width,
                             uint32_t height) {
  struct pixman_renderer *renderer = pixman_renderer(base);
  pixman_color_t pixman_color = PIXMAN_COLOR(color);
  pixman_box32_t box = {x, y, x + width, y + height};

  pixman_image_fill_boxes(PIXMAN_OP_SRC, renderer->target, &pixman_color, 1,
                          &box);
}

void renderer_fill_region(struct wld_renderer *base, uint32_t color,
                          pixman_region32_t *region) {
  struct pixman_renderer *renderer = pixman_renderer(base);
  pixman_color_t pixman_color = PIXMAN_COLOR(color);
  pixman_box32_t *boxes;
  int num_boxes;

  boxes = pixman_region32_rectangles(region, &num_boxes);
  pixman_image_fill_boxes(PIXMAN_OP_SRC, renderer->target, &pixman_color,
                          num_boxes, boxes);
}

void renderer_copy_rectangle(struct wld_renderer *base, struct buffer *buffer,
                             int32_t dst_x, int32_t dst_y, int32_t src_x,
                             int32_t src_y, uint32_t width, uint32_t height) {
  struct pixman_renderer *renderer = pixman_renderer(base);
  pixman_image_t *src = pixman_image(buffer), *dst = renderer->target;

  if (!src)
    return;

  pixman_image_composite32(PIXMAN_OP_SRC, src, NULL, dst, src_x, src_y, 0, 0,
                           dst_x, dst_y, width, height);
}

void renderer_copy_region(struct wld_renderer *base, struct buffer *buffer,
                          int32_t dst_x, int32_t dst_y,
                          pixman_region32_t *region) {
  struct pixman_renderer *renderer = pixman_renderer(base);
  pixman_image_t *src = pixman_image(buffer), *dst = renderer->target;

  if (!src)
    return;

  pixman_image_set_clip_region32(src, region);
  pixman_image_composite32(PIXMAN_OP_SRC, src, NULL, dst, region->extents.x1,
                           region->extents.y1, 0, 0, region->extents.x1 + dst_x,
                           region->extents.y1 + dst_y,
                           region->extents.x2 - region->extents.x1,
                           region->extents.y2 - region->extents.y1);
  pixman_image_set_clip_region32(src, NULL);
}

static inline uint8_t reverse(uint8_t byte) {
  byte = ((byte << 1) & 0xaa) | ((byte >> 1) & 0x55);
  byte = ((byte << 2) & 0xcc) | ((byte >> 2) & 0x33);
  byte = ((byte << 4) & 0xf0) | ((byte >> 4) & 0x0f);

  return byte;
}

void renderer_draw_text(struct wld_renderer *base, struct font *font,
                        uint32_t color, int32_t x, int32_t y, const char *text,
                        uint32_t length, struct wld_extents *extents) {
  struct pixman_renderer *renderer = pixman_renderer(base);
  int ret;
  uint32_t c;
  struct glyph *glyph;
  FT_UInt glyph_index;
  pixman_glyph_t glyphs[length == -1 ? (length = strlen(text)) : length];
  uint32_t index = 0, origin_x = 0;
  pixman_color_t pixman_color = PIXMAN_COLOR(color);
  pixman_image_t *solid;

  solid = pixman_image_create_solid_fill(&pixman_color);

  while ((ret = FcUtf8ToUcs4((FcChar8 *)text, &c, length)) > 0 && c != '\0') {
    text += ret;
    length -= ret;
    glyph_index = FT_Get_Char_Index(font->face, c);

    if (!font_ensure_glyph(font, glyph_index))
      continue;

    glyph = font->glyphs[glyph_index];

    glyphs[index].x = origin_x;
    glyphs[index].y = 0;
    glyphs[index].glyph =
        pixman_glyph_cache_lookup(renderer->glyph_cache, font, glyph);

    /* If we don't have the glyph in our cache, do some conversions to make
     * pixman happy, and then insert it. */
    if (!glyphs[index].glyph) {
      uint8_t *src, *dst;
      uint32_t row, byte_index, bytes_per_row, pitch;
      pixman_image_t *image;
      FT_Bitmap *bitmap;

      bitmap = &glyph->bitmap;
      image = pixman_image_create_bits(PIXMAN_a1, bitmap->width, bitmap->rows,
                                       NULL, bitmap->pitch);

      if (!image)
        goto advance;

      pitch = pixman_image_get_stride(image);
      bytes_per_row = (bitmap->width + 7) / 8;
      src = bitmap->buffer;
      dst = (uint8_t *)pixman_image_get_data(image);

      for (row = 0; row < bitmap->rows; ++row) {
        /* Pixman's A1 format expects the bits in the opposite order
         * that Freetype gives us. Sigh... */
        for (byte_index = 0; byte_index < bytes_per_row; ++byte_index)
          dst[byte_index] = reverse(src[byte_index]);

        dst += pitch;
        src += bitmap->pitch;
      }

      /* Insert the glyph into the cache. */
      pixman_glyph_cache_freeze(renderer->glyph_cache);
      glyphs[index].glyph = pixman_glyph_cache_insert(
          renderer->glyph_cache, font, glyph, -glyph->x, -glyph->y, image);
      pixman_glyph_cache_thaw(renderer->glyph_cache);

      /* The glyph cache copies the contents of the glyph bitmap. */
      pixman_image_unref(image);
    }

    ++index;

  advance:
    origin_x += glyph->advance;
  }

  pixman_composite_glyphs_no_mask(PIXMAN_OP_OVER, solid, renderer->target, 0, 0,
                                  x, y, renderer->glyph_cache, index, glyphs);

  pixman_image_unref(solid);

  if (extents)
    extents->advance = origin_x;
}

void renderer_flush(struct wld_renderer *renderer) {}

void renderer_destroy(struct wld_renderer *base) {
  struct pixman_renderer *renderer = pixman_renderer(base);

  pixman_glyph_cache_destroy(renderer->glyph_cache);
  free(renderer);
}

bool buffer_map(struct buffer *buffer) { return true; }

bool buffer_unmap(struct buffer *buffer) { return true; }

void buffer_destroy(struct buffer *base) {
  struct pixman_buffer *buffer = pixman_buffer(&base->base);

  pixman_image_unref(buffer->image);
  free(buffer);
}